1
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Gao ZR, Yu H, Chen FJ, Mayoral A, Niu Z, Niu Z, Li X, Deng H, Márquez-Álvarez C, He H, Xu S, Zhou Y, Xu J, Xu H, Fan W, Balestra SRG, Ma C, Hao J, Li J, Wu P, Yu J, Camblor MA. Interchain-expanded extra-large-pore zeolites. Nature 2024; 628:99-103. [PMID: 38538794 DOI: 10.1038/s41586-024-07194-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 02/12/2024] [Indexed: 04/01/2024]
Abstract
Stable aluminosilicate zeolites with extra-large pores that are open through rings of more than 12 tetrahedra could be used to process molecules larger than those currently manageable in zeolite materials. However, until very recently1-3, they proved elusive. In analogy to the interlayer expansion of layered zeolite precursors4,5, we report a strategy that yields thermally and hydrothermally stable silicates by expansion of a one-dimensional silicate chain with an intercalated silylating agent that separates and connects the chains. As a result, zeolites with extra-large pores delimited by 20, 16 and 16 Si tetrahedra along the three crystallographic directions are obtained. The as-made interchain-expanded zeolite contains dangling Si-CH3 groups that, by calcination, connect to each other, resulting in a true, fully connected (except possible defects) three-dimensional zeolite framework with a very low density. Additionally, it features triple four-ring units not seen before in any type of zeolite. The silicate expansion-condensation approach we report may be amenable to further extra-large-pore zeolite formation. Ti can be introduced in this zeolite, leading to a catalyst that is active in liquid-phase alkene oxidations involving bulky molecules, which shows promise in the industrially relevant clean production of propylene oxide using cumene hydroperoxide as an oxidant.
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Affiliation(s)
- Zihao Rei Gao
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain
- Department of Chemical and Biomolecular Engineering and Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD, USA
| | - Huajian Yu
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain
| | - Fei-Jian Chen
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, International Center of Future Science, Jilin University, Changchun, China
| | - Alvaro Mayoral
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza, Spain
| | - Zijian Niu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, International Center of Future Science, Jilin University, Changchun, China
| | - Ziwen Niu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Xintong Li
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Hua Deng
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
| | | | - Hong He
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China
| | - Shutao Xu
- National Engineering Research Center of Lower-Carbon Catalysis Technology, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Yida Zhou
- National Engineering Research Center of Lower-Carbon Catalysis Technology, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Jun Xu
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China
| | - Hao Xu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Wei Fan
- Department of Chemical Engineering, University of Massachusetts, Amherst, MA, USA
| | - Salvador R G Balestra
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain
- Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Seville, Spain
| | - Chao Ma
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China
| | - Jiazheng Hao
- Spallation Neutron Source Science Center, Dongguan, China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Jian Li
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China.
| | - Peng Wu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China.
| | - Jihong Yu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, International Center of Future Science, Jilin University, Changchun, China.
| | - Miguel A Camblor
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.
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2
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Li H, Zhang C, Lin Q, Lin F, Xiao T, Yan K, Shen B, Zhang H, Tang Y, Sun Z. Epitaxial Growth of Two-Dimensional MWW Zeolite. J Am Chem Soc 2024; 146:8520-8527. [PMID: 38491937 DOI: 10.1021/jacs.4c00162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2024]
Abstract
Two-dimensional (2D) zeolite, with a high aspect ratio, has more open skeletons and accessible active sites than its three-dimensional (3D) counterpart. However, traditional methods of obtaining 2D zeolites often cause structural damage and widespread skeleton defects, hindering efficient selectivity in molecular separation. In this study, we present, for the first time, a direct epitaxial synthesis of 2D zeolite (Epi-MWW) guided by hexagonal boron nitride (h-BN) with a coincidence matching of site lattices to MWW zeolite. The as-grown Epi-MWW zeolite possesses a high crystallinity and intact hexagonal 2D morphology, with an average thickness of 10 nm and an aspect ratio of over 50. Thanks to its excellent molecular accessibility, the diffusion time constants of o-xylene (OX) and p-xylene (PX) are as 12 and 133 times higher than those of conventional MCM-22, respectively; the PX/OX selectivity of Epi-MWW is 7.4 times better than MCM-22 as calculated by the ideal adsorbed solution theory.
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Affiliation(s)
- Hongbin Li
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
- School of Microelectronics and State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, P. R. China
| | - Chunna Zhang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
| | - Qiang Lin
- School of Mechanical Engineering and State Key Laboratory of Mechanical Systems and Vibration, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Feng Lin
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
| | - Taishi Xiao
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
| | - Kexin Yan
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
| | - Bin Shen
- School of Mechanical Engineering and State Key Laboratory of Mechanical Systems and Vibration, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Hongbin Zhang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
- Institute for Preservation of Chinese Ancient Books, Fudan University Library, Fudan University, Shanghai 200433, P. R. China
| | - Yi Tang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
| | - Zhengzong Sun
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
- School of Microelectronics and State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, P. R. China
- Yiwu Research Institute of Fudan University, Yiwu, Zhejiang 322000, P. R. China
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3
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Pornsetmetakul P, Coumans FJAG, Heinrichs JMJJ, Zhang H, Wattanakit C, Hensen EJM. Accelerated Synthesis of Nanolayered MWW Zeolite by Interzeolite Transformation. Chemistry 2024; 30:e202302931. [PMID: 37986265 DOI: 10.1002/chem.202302931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 11/04/2023] [Accepted: 11/14/2023] [Indexed: 11/22/2023]
Abstract
Hierarchical zeolites can offer substantial benefits over bulk zeolites in catalysis. A drawback towards practical implementation is their lengthy synthesis, often requiring complex organic templates. This work describes an accelerated synthesis of nanolayered MWW zeolite based on the combination of interzeolite transformation (IZT) with a dual-templating strategy. FAU zeolite, hexamethyleneimine (HMI), and cetyltrimethylammonium bromide (CTAB) were respectively employed as Al source and primary zeolite, structure directing agent, and exfoliating agent. This approach allowed to reduce the synthesis of nanolayered MWW to 48 h, which is a considerable advance over the state of the art. Tracking structural, textural, morphological, and chemical properties during crystallization showed that 4-membered-ring (4MR) units derived from the FAU precursor are involved in the faster formation of MWW in comparison to a synthesis procedure from amorphous precursor. CTAB restricts the growth of the zeolite in the c-direction, resulting in nanolayered MWW. Moreover, we show that this approach can speed up the synthesis of nanolayered FER. The merits of nanolayered MWW zeolites are demonstrated in terms of improved catalytic performance in the Diels-Alder cycloaddition of 2,5-dimethylfuran and ethylene to p-xylene compared to bulk reference MWW sample.
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Affiliation(s)
- Peerapol Pornsetmetakul
- School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology, 21210, Rayong, Thailand
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Ferdy J A G Coumans
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Jason M J J Heinrichs
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Hao Zhang
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Chularat Wattanakit
- School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology, 21210, Rayong, Thailand
| | - Emiel J M Hensen
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands
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4
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Matveeva VG, Bronstein LM. Design of Bifunctional Nanocatalysts Based on Zeolites for Biomass Processing. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2274. [PMID: 37630859 PMCID: PMC10458776 DOI: 10.3390/nano13162274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/02/2023] [Accepted: 08/04/2023] [Indexed: 08/27/2023]
Abstract
Bifunctional catalysts consisting of metal-containing nanoparticles (NPs) and zeolite supports have received considerable attention due to their excellent catalytic properties in numerous reactions, including direct (biomass is a substrate) and indirect (platform chemical is a substrate) biomass processing. In this short review, we discuss major approaches to the preparation of NPs in zeolites, concentrating on methods that allow for the best interplay (synergy) between metal and acid sites, which is normally achieved for small NPs well-distributed through zeolite. We focus on the modification of zeolites to provide structural integrity and controlled acidity, which can be accomplished by the incorporation of certain metal ions or elements. The other modification avenue is the adjustment of zeolite morphology, including the creation of numerous defects for the NP entrapment and designed hierarchical porosity for improved mass transfer. In this review, we also provide examples of synergy between metal and acid sites and emphasize that without density functional theory calculations, many assumptions about the interactions between active sites remain unvalidated. Finally, we describe the most interesting examples of direct and indirect biomass (waste) processing for the last five years.
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Affiliation(s)
- Valentina G. Matveeva
- Department of Biotechnology, Chemistry and Standardization, Tver State Technical University, 22 A. Nikitina St., 170026 Tver, Russia;
- Regional Technological Centre, Tver State University, Zhelyabova St., 33, 170100 Tver, Russia
| | - Lyudmila M. Bronstein
- Department of Biotechnology, Chemistry and Standardization, Tver State Technical University, 22 A. Nikitina St., 170026 Tver, Russia;
- Department of Chemistry, Indiana University, 800 E. Kirkwood Av., Bloomington, IN 47405, USA
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5
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Alharbi KH, Alharbi W, Alhayyani S, Roselin LS, Selvin R. Enhanced Oxidation of p-Toluidine Using Supported Zeolite Nanoparticles. Molecules 2023; 28:5737. [PMID: 37570707 PMCID: PMC10420039 DOI: 10.3390/molecules28155737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 07/26/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023] Open
Abstract
Supported nanomaterials are becoming increasingly important in many industrial processes because of the need to improve both the efficiency and environmental acceptability of industrial processes. The unique properties of supported nanomaterials have attracted researchers to develop efficient catalytic materials in nanoscale. The extremely small size of the particles maximizes the surface area exposed to the reactant, allowing more reactions to occur. The environmental hazards resulting from the conventional manufacturing procedures for organic fine chemicals and intermediates by classical oxidation catalysis using mineral acids have forced chemical industries to seek less polluting processes. The present study aimed to oxidize p-toluidine by hydrogen peroxide in the presence of magnetite supported on nanocrystalline titanium silicalite-1 (M/NTS) zeolite at ambient temperature. The products detected are 4,4'-dimethylazobenzene as major product and 4,4'-dimethylazoxybenzene as minor product. Good selectivity, low cost, low wastage of materials and enhanced environmental friendliness of heterogeneous magnetite nanoparticle supported zeolite catalysts were observed. The effect of various reaction parameters such as mole ratio, catalyst weight and reusability of catalyst were studied. At the optimum reaction conditions, the oxidation activity of M/NTS catalyst was compared with M/NS catalyst, and it was found that titanium in the framework of M/NTS provided higher activity and selectivity.
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Affiliation(s)
- Khadijah H. Alharbi
- Department of Chemistry, Science and Arts College, King Abdulaziz University, Rabigh 21911, Saudi Arabia; (W.A.); (S.A.); (L.S.R.)
| | - Walaa Alharbi
- Department of Chemistry, Science and Arts College, King Abdulaziz University, Rabigh 21911, Saudi Arabia; (W.A.); (S.A.); (L.S.R.)
| | - Sultan Alhayyani
- Department of Chemistry, Science and Arts College, King Abdulaziz University, Rabigh 21911, Saudi Arabia; (W.A.); (S.A.); (L.S.R.)
| | - L. Selva Roselin
- Department of Chemistry, Science and Arts College, King Abdulaziz University, Rabigh 21911, Saudi Arabia; (W.A.); (S.A.); (L.S.R.)
| | - Rosilda Selvin
- Department of Basic Sciences and Humanities, Don Bosco Institute of Technology, Kurla (W), Mumbai 400 070, India;
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6
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Suib SL, Přech J, Szaniawska E, Čejka J. Recent Advances in Tetra- (Ti, Sn, Zr, Hf) and Pentavalent (Nb, V, Ta) Metal-Substituted Molecular Sieve Catalysis. Chem Rev 2023; 123:877-917. [PMID: 36547404 DOI: 10.1021/acs.chemrev.2c00509] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Metal substitution of molecular sieve systems is a major driving force in developing novel catalytic processes to meet current demands of green chemistry concepts and to achieve sustainability in the chemical industry and in other aspects of our everyday life. The advantages of metal-substituted molecular sieves include high surface areas, molecular sieving effects, confinement effects, and active site and morphology variability and stability. The present review aims to comprehensively and critically assess recent advances in the area of tetra- (Ti, Sn, Zr, Hf) and pentavalent (V, Nb, Ta) metal-substituted molecular sieves, which are mainly characterized for their Lewis acidic active sites. Metal oxide molecular sieve materials with properties similar to those of zeolites and siliceous molecular sieve systems are also discussed, in addition to relevant studies on metal-organic frameworks (MOFs) and some composite MOF systems. In particular, this review focuses on (i) synthesis aspects determining active site accessibility and local environment; (ii) advances in active site characterization and, importantly, quantification; (iii) selective redox and isomerization reaction applications; and (iv) photoelectrocatalytic applications.
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Affiliation(s)
- Steven L Suib
- Departments of Chemistry and Chemical and Biomolecular Engineering, and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Jan Přech
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43 Prague 2, Czech Republic
| | - Ewelina Szaniawska
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43 Prague 2, Czech Republic
| | - Jiří Čejka
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43 Prague 2, Czech Republic
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Roth WJ, Sasaki T, Wolski K, Gil B, Zapotoczny S, Čejka J, Kubů M, Mazur M, Ebina Y, Sakai N, Tang DM, Ma R. Exfoliating layered zeolite MFI into unilamellar nanosheets in solution as precursors for the synthesis of hierarchical nanocomposites and oriented films. Inorg Chem Front 2023. [DOI: 10.1039/d2qi02283d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The separation of layered MFI into unilamellar nanosheets in solution confirms the general validity of soft-chemical exfoliation for zeolites and allows top-down production of films with potential applications in separation and catalysis.
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Affiliation(s)
- Wieslaw J. Roth
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
| | - Takayoshi Sasaki
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Karol Wolski
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
| | - Barbara Gil
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
| | - Szczepan Zapotoczny
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
| | - Jiří Čejka
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 8, 12840 Prague 2, Czech Republic
| | - Martin Kubů
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 8, 12840 Prague 2, Czech Republic
| | - Michal Mazur
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 8, 12840 Prague 2, Czech Republic
| | - Yasuo Ebina
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Nobuyuki Sakai
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Dai-Ming Tang
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Renzhi Ma
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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8
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Catalytic oxidation performance and ion-exchange of Ti-MWW zeolite membrane with dual organic template agents and potassium carbonate. J Catal 2022. [DOI: 10.1016/j.jcat.2022.12.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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9
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She M, Gu R, Meng D, Yang H, Wen Y, Qian X, Guo X, Ding W. Nanosheets of Ni‐SAPO‐34 Molecular Sieve for Selective Oxidation of Cyclohexanone to Adipic Acid. Chemistry 2022; 28:e202200696. [DOI: 10.1002/chem.202200696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Minyi She
- School of Chemistry and Chemical Engineering Key Laboratory of Mesoscopic Chemistry of Ministry of Education Nanjing University Nanjing 210023 Jiangsu China
| | - Rongtian Gu
- School of Chemistry and Chemical Engineering Key Laboratory of Mesoscopic Chemistry of Ministry of Education Nanjing University Nanjing 210023 Jiangsu China
| | - Deming Meng
- School of Chemistry and Chemical Engineering Key Laboratory of Mesoscopic Chemistry of Ministry of Education Nanjing University Nanjing 210023 Jiangsu China
| | - Hua Yang
- School of Chemistry and Chemical Engineering Key Laboratory of Mesoscopic Chemistry of Ministry of Education Nanjing University Nanjing 210023 Jiangsu China
| | - Yujie Wen
- School of Chemistry and Chemical Engineering Key Laboratory of Mesoscopic Chemistry of Ministry of Education Nanjing University Nanjing 210023 Jiangsu China
| | - Xiaofeng Qian
- School of Chemistry and Chemical Engineering Key Laboratory of Mesoscopic Chemistry of Ministry of Education Nanjing University Nanjing 210023 Jiangsu China
| | - Xiangke Guo
- School of Chemistry and Chemical Engineering Key Laboratory of Mesoscopic Chemistry of Ministry of Education Nanjing University Nanjing 210023 Jiangsu China
| | - Weiping Ding
- School of Chemistry and Chemical Engineering Key Laboratory of Mesoscopic Chemistry of Ministry of Education Nanjing University Nanjing 210023 Jiangsu China
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10
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Reduced deactivation of mechanochemically delaminated hierarchical zeolite MCM-22 catalysts during 4-propylphenol cracking. J Catal 2022. [DOI: 10.1016/j.jcat.2022.05.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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Yue Q, Kutukova K, Li A, Čejka J, Zschech E, Opanasenko M. Controllable Zeolite AST Crystallization: Between Classical and Reversed Crystal Growth. Chemistry 2022; 28:e202200590. [DOI: 10.1002/chem.202200590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Qiudi Yue
- Department of Physical and Macromolecular Chemistry Faculty of Science Charles University Hlavova 8 128 43 Prague Czechia
| | - Kristina Kutukova
- Fraunhofer Institute for Ceramic Technologies and Systems (IKTS) Maria-Reiche-Str. 2 01109 Dresden Germany
- Present address: deepXscan GmbH Zeppelinstr. 1 01324 Dresden Germany
| | - Ang Li
- Department of Physical and Macromolecular Chemistry Faculty of Science Charles University Hlavova 8 128 43 Prague Czechia
| | - Jiří Čejka
- Department of Physical and Macromolecular Chemistry Faculty of Science Charles University Hlavova 8 128 43 Prague Czechia
| | | | - Maksym Opanasenko
- Department of Physical and Macromolecular Chemistry Faculty of Science Charles University Hlavova 8 128 43 Prague Czechia
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Ogorzały K, Jajko G, Wolski K, Zapotoczny S, Kubů M, Roth WJ, Gil B, Makowski W. Catalytic activity enhancement in pillared zeolites produced from exfoliated MWW monolayers in solution. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.10.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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13
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Molitorisová S, Zhang Y, Kubů M, Li A, Tošner Z, Shamzhy M. 2D-to-3D zeolite transformation for the preparation of Pd@MWW catalysts with tuneable acidity. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.11.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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15
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Cao S, Sun Y, Shang Y, Wang J, Gong Y, Mo G, Li Z, Zhang ZD, Ma A. Dual-template synthesis of thinner-layered MCM-49 zeolite to boost its alkylation performance. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Sadovnikov AA, Arapova OV, Russo V, Maximov AL, Murzin DY, Naranov ER. Synergy of Acidity and Morphology of Micro-/Mesoporous Materials in the Solid-Acid Alkylation of Toluene with 1-Decene. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c04169] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexey A. Sadovnikov
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prospekt, bld. 29, 119991 Moscow, Russia
| | - Olga V. Arapova
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prospekt, bld. 29, 119991 Moscow, Russia
| | - Vincenzo Russo
- Universita degli Studi di Napoli “Federico II”, 80138 Naples, Italy
| | - Anton L. Maximov
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prospekt, bld. 29, 119991 Moscow, Russia
| | - Dmitry Yu Murzin
- Åbo Akademi University, Henriksgatan 2, Turku/Åbo 20500, Finland
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17
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He L, Yao Q, Sun M, Ma X. Progress in Preparation and Catalysis of Two-dimensional (2D) and Three-dimensional (3D) Zeolites. ACTA CHIMICA SINICA 2022. [DOI: 10.6023/a21100489] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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18
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Zhang C, Lin F, Kong L, Ye Z, Pan D, Li H, Li H, Liu P, Zhang Y, Zhang H, Tang Y. c-Axis-penetrated mesoporous MWW zeolite nanosheets: preparation by H 2O 2-induced micro-explosion and their enhanced properties. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00928e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of highly dispersed and c-axis-penetrated mesoporous MWW oligolayers with enhanced properties was prepared via an efficient, green, and controllable method through H2O2-induced micro-explosion.
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Affiliation(s)
- Chunna Zhang
- Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Feng Lin
- Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Lingtao Kong
- Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Zhaoqi Ye
- Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Di Pan
- Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Hongbin Li
- Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - He Li
- Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Peng Liu
- Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Yahong Zhang
- Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
| | - Hongbin Zhang
- Institute for Preservation of Chinese Ancient Books, Fudan University Library, Fudan University, Shanghai 200433, China
| | - Yi Tang
- Department of Chemistry, Laboratory of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
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19
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Lee D, Kim JJ, Ali M, Choung JW, Lee WB, Bae JW, Park MJ. Mechanistic kinetic modeling for catalytic conversion of DME to gasoline-range hydrocarbons over nanostructured ZSM-5. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00616b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new kinetic model for the synthesis of gasoline-range hydrocarbons from dimethyl ether over a nanostructured ZSM-5 catalyst was developed based on the dual-cycle reaction mechanism.
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Affiliation(s)
- Damin Lee
- School of Chemical & Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Jong Jin Kim
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
| | - Mansoor Ali
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
| | | | - Won Bo Lee
- School of Chemical & Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Jong Wook Bae
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
| | - Myung-June Park
- Department of Energy Systems Research, Ajou University, Suwon 16499, Republic of Korea
- Department of Chemical Engineering, Ajou University, Suwon 16499, Republic of Korea
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20
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Hao J, Xu S, Cheng DG, Chen F, Zhan X. Synthesis of nanosheet epitaxial growth ZSM-5 zeolite with increased diffusivity and its catalytic cracking performance. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00154c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The introduction of microporous substrate in the nanosheet zeolite reduces the “acid wall” barrier. The diffusional time constant of RP-120 is increased by 32%, and its TOF is increased by 54%.
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Affiliation(s)
- Jing Hao
- College of Chemical and Biological Engineering, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Zhejiang University, Hangzhou 310027, China
| | - Shuman Xu
- College of Chemical and Biological Engineering, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Zhejiang University, Hangzhou 310027, China
| | - Dang-guo Cheng
- College of Chemical and Biological Engineering, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Zhejiang University, Hangzhou 310027, China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, China
| | - Fengqiu Chen
- College of Chemical and Biological Engineering, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Zhejiang University, Hangzhou 310027, China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, China
| | - Xiaoli Zhan
- College of Chemical and Biological Engineering, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Zhejiang University, Hangzhou 310027, China
- Institute of Zhejiang University-Quzhou, Quzhou 324000, China
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21
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Barakov R, Shcherban N, Petrov O, Lang J, Shamzhy M, Opanasenko M, Cejka J. MWW-type zeolite nanostructures for a one-pot three-component Prins–Friedel–Crafts reaction. Inorg Chem Front 2022. [DOI: 10.1039/d1qi01497h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One-pot Prins–Friedel–Crafts reaction of aldehydes, homoallylic alcohol and aromatics catalyzed by large-pore zeolites is an attractive environmentally friendly route towards valuable heterocyclic compounds containing 4 aryltetrahydropyran moiety. Herein, a catalytic...
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22
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Bian C, Yang Y, Luo X, Zhang W, Zhang J, Zhu L, Qiu J. Advances in the Synthesis of Crystalline Metallosilicate Zeolites via Interlayer Expansion. Molecules 2021; 26:5916. [PMID: 34641458 PMCID: PMC8512749 DOI: 10.3390/molecules26195916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/23/2021] [Accepted: 09/24/2021] [Indexed: 12/04/2022] Open
Abstract
Given the numerous industrial applications of zeolites as adsorbents, catalysts, and ion-exchangers, the development of new zeolite structures is highly desired to expand their practical applications. Currently, a general route to develop new zeolite structures is to use interlayer expansion agents to connect layered silicates. In this review, we briefly summarize the novel zeolite structures constructed from the lamellar precursor zeolites MWW, RUB-36, PREFER, Nu-6(1), COK-5, and PLS-1 via interlayer expansion. The contents of the summary contain detailed experiments, physicochemical characterizations, possible expansion mechanisms, and catalytic properties. In addition, the insertion of metal heteroatoms (such as Ti, Fe, Sn) into the layered zeolite precursor through interlayer expansion, which could be helpful to modify the catalytic function, is discussed.
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Affiliation(s)
- Chaoqun Bian
- Pharmaceutical and Material Engineering School, Jinhua Polytechnic, Jinhua 321000, China; (X.L.); (W.Z.); (J.Z.)
| | - Yichang Yang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China;
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xiaohui Luo
- Pharmaceutical and Material Engineering School, Jinhua Polytechnic, Jinhua 321000, China; (X.L.); (W.Z.); (J.Z.)
| | - Wenxia Zhang
- Pharmaceutical and Material Engineering School, Jinhua Polytechnic, Jinhua 321000, China; (X.L.); (W.Z.); (J.Z.)
| | - Jie Zhang
- Pharmaceutical and Material Engineering School, Jinhua Polytechnic, Jinhua 321000, China; (X.L.); (W.Z.); (J.Z.)
| | - Longfeng Zhu
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China;
| | - Jianping Qiu
- Xingzhi College, Zhejiang Normal University, Jinhua 321004, China;
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23
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Roth WJ, Sasaki T, Wolski K, Ebina Y, Tang DM, Michiue Y, Sakai N, Ma R, Cretu O, Kikkawa J, Kimoto K, Kalahurska K, Gil B, Mazur M, Zapotoczny S, Čejka J, Grzybek J, Kowalczyk A. Exfoliated Ferrierite-Related Unilamellar Nanosheets in Solution and Their Use for Preparation of Mixed Zeolite Hierarchical Structures. J Am Chem Soc 2021; 143:11052-11062. [PMID: 34264655 PMCID: PMC8397323 DOI: 10.1021/jacs.1c04081] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Direct exfoliation of layered zeolites into solutions of monolayers has remained unresolved since the 1990s. Recently, zeolite MCM-56 with the MWW topology (layers denoted mww) has been exfoliated directly in high yield by soft-chemical treatment with tetrabutylammonium hydroxide (TBAOH). This has enabled preparation of zeolite-based hierarchical materials and intimate composites with other active species that are unimaginable via the conventional solid-state routes. The extension to other frameworks, which provides broader benefits, diversified activity, and functionality, is not routine and requires finding suitable synthesis formulations, viz. compositions and conditions, of the layered zeolites themselves. This article reports exfoliation and characterization of layers with ferrierite-related structure, denoted bifer, having rectangular lattice constants like those of the FER and CDO zeolites, and thickness of approximately 2 nm, which is twice that of the so-called fer layer. Several techniques were combined to prove the exfoliation, supported by simulations: AFM; in-plane, in situ, and powder X-ray diffraction; TEM; and SAED. The results confirmed (i) the structure and crystallinity of the layers without unequivocal differentiation between the FER and CDO topologies and (ii) uniform thickness in solution (monodispersity), ruling out significant multilayered particles and other impurities. The bifer layers are zeolitic with Brønsted acid sites, demonstrated catalytic activity in the alkylation of mesitylene with benzyl alcohol, and intralayer pores visible in TEM. The practical benefits are demonstrated by the preparation of unprecedented intimately mixed zeolite composites with the mww, with activity greater than the sum of the components despite high content of inert silica as pillars.
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Affiliation(s)
- Wieslaw J Roth
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków 30-387, Poland
| | - Takayoshi Sasaki
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan
| | - Karol Wolski
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków 30-387, Poland
| | - Yasuo Ebina
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan
| | - Dai-Ming Tang
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan
| | - Yuichi Michiue
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan
| | - Nobuyuki Sakai
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan
| | - Renzhi Ma
- International Centre for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan
| | - Ovidiu Cretu
- Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Jun Kikkawa
- Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Koji Kimoto
- Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Katarzyna Kalahurska
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków 30-387, Poland
| | - Barbara Gil
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków 30-387, Poland
| | - Michal Mazur
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 8, Prague 2 12840, Czech Republic
| | - Szczepan Zapotoczny
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków 30-387, Poland
| | - Jiri Čejka
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 8, Prague 2 12840, Czech Republic
| | - Justyna Grzybek
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków 30-387, Poland
| | - Andrzej Kowalczyk
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków 30-387, Poland
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24
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From Colloidal Dispersions of Zeolite Monolayers to Effective Solid Catalysts in Transformations of Bulky Organic Molecules: Role of Freeze-Drying and Dialysis. Molecules 2021; 26:molecules26072076. [PMID: 33916558 PMCID: PMC8038491 DOI: 10.3390/molecules26072076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 03/26/2021] [Accepted: 04/01/2021] [Indexed: 11/17/2022] Open
Abstract
We investigated the properties and catalytic activity of zeolites with MWW topology obtained by unprecedented liquid exfoliation of the MCM-56 zeolite into solutions of monolayers and isolation/reassembly of the dispersed layers by various methods, with optional purification by dialysis or ammonium exchange. The layers were recovered by flocculation with alcohol or ammonium nitrate and freeze-drying. Flocculation alone, even with ammonium nitrate, did not ensure removal of residual sodium cations resulting in catalysts with low activity. Dialysis of the solutions with dispersed monolayers proved to be efficient in removing sodium cations and preserving microporosity. The monolayers were also isolated as solids by freeze-drying. The highest BET area and pore volume obtained with the freeze-dried sample confirmed lyophilization efficiency in preserving layer structure. The applied test reaction, Friedel–Crafts alkylation of mesitylene, showed high benzyl alcohol conversion due to increased concentration of accessible acid centers caused by the presence of secondary mesoporosity. The applied treatments did not change the acid strength of the external acid sites, which are the most important ones for converting bulky organic molecules. Zeolite acidity was not degraded in the course of exfoliation into monolayers, showing the potential of such colloid dispersions for the formation of active catalysts.
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25
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Structure-Catalytic Properties Relationship in Friedel Crafts Alkylation Reaction for MCM-36-Type Zeolites Obtained by Isopropanol-Assisted Pillaring. Catalysts 2021. [DOI: 10.3390/catal11030299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
MWW type zeolites are characterized by the presence of zeolitic layers of 2.5 nm thickness, containing 10-member ring sinusoidal channels inside and supercavities with 12-member ring openings located on their surfaces. Expansion and pillaring of layered zeolites increase the access to active sites and can enable or facilitate catalytic activity towards larger reactant molecules. This goal is explored in this work reporting the pillaring of layered zeolite MCM-56 with MWW topology by tetraethylorthosilicate (TEOS) treatment with the assistance of isopropanol, aimed at obtaining hierarchical micro-mesoporous systems. MCM-56 (Si/Al = 12) was synthesized with hexamethyleneimine as a structure-directing and aniline as a structure-promoting agent. Hierarchical porous systems were obtained using two different pillaring methods: (1) with TEOS only and (2) with TEOS mixed with isopropanol. The MWW framework was preserved during swelling/pillaring in both methods. Pillared zeolites obtained via alcohol-assisted pillaring possessed unique intermediate micro-mesopores with the size of about 2 nm. IR study revealed a decrease in the concentration of accessible acid centers upon pillaring. However, the fraction of acid sites on the external surface, accessible for adsorption of large molecules, increased by up to 90%. Catalytic activity was evaluated in the Friedel-Crafts alkylation of mesitylene with benzyl alcohol. Pillaring resulted in reduction of the acid site concentrations, but the materials retained high catalytic activity. Pillaring in the presence of alcohol produced increased turnover frequency values based on the concentrations of the external acid sites.
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