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Liu D, Hu H, Yang Y, Cui J, Fan X, Zhao Z, Kong L, Xiao X, Xie Z. Restructuring effects of Pt and Fe in Pt/Fe-DMSN catalysts and their enhancement of propane dehydrogenation. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.03.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Effects of Fe species on promoting the dibenzothiophene hydrodesulfurization over the Pt/γ-Al2O3 catalysts. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.07.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Xu D, Wang S, Wu B, Zhang B, Qin Y, Huo C, Huang L, Wen X, Yang Y, Li Y. Highly Dispersed Single-Atom Pt and Pt Clusters in the Fe-Modified KL Zeolite with Enhanced Selectivity for n-Heptane Aromatization. ACS APPLIED MATERIALS & INTERFACES 2019; 11:29858-29867. [PMID: 31343150 DOI: 10.1021/acsami.9b08137] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Conversion of straight-chain paraffins into aromatics is particularly attractive but extremely challenging in the oil refining industry. Constructing the Pt-supported catalysts with high aromatic selectivity is vital. Here, we report a strategy to use Fe-modified KL zeolites to improve the Pt atom utilization efficiency and anchor them inside KL zeolite channels via atomic-layer deposition technique. A combination of highly dispersed single-atom Pt and electron-rich Pt clusters is fabricated on the KL zeolite through the creation of proper nucleation sites. The resulted catalyst (PtFe-1/KL) exhibits excellent performance for the n-heptane aromatization (90.1% aromatic selectivity) with an apparent activation energy of 131 kJ/mol and much enhanced stability at a relatively lower temperature (420 °C). Experimental analysis and density functional theory calculation demonstrate that the single-atom Pt might play a key role in the initial dehydrogenation of n-heptane to 1-heptene, and the superior stable Pt clusters encapsulated inside Fe-decorated KL zeolite channels accelerate the 1-heptene dehydrocyclization to aromatics. The synergetic interaction between single-atom Pt and Pt clusters enables the PtFe-1/KL catalyst to be one of the most effective n-heptane aromatization catalysts reported to date.
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Affiliation(s)
- Dan Xu
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry , Chinese Academy of Sciences , Taiyuan 030001 , People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Shuyuan Wang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry , Chinese Academy of Sciences , Taiyuan 030001 , People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China
| | - Baoshan Wu
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry , Chinese Academy of Sciences , Taiyuan 030001 , People's Republic of China
- National Energy Research Center for Clean Fuels , Synfuels China Co., Ltd. , Beijing 101400 , People's Republic of China
- Beijng Key Laboratory of Coal to Cleaning Liquid Fuels , Beijing 101400 , People's Republic of China
| | - Bin Zhang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry , Chinese Academy of Sciences , Taiyuan 030001 , People's Republic of China
| | - Yong Qin
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry , Chinese Academy of Sciences , Taiyuan 030001 , People's Republic of China
| | - Chunfang Huo
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry , Chinese Academy of Sciences , Taiyuan 030001 , People's Republic of China
- National Energy Research Center for Clean Fuels , Synfuels China Co., Ltd. , Beijing 101400 , People's Republic of China
| | - Lihua Huang
- National Energy Research Center for Clean Fuels , Synfuels China Co., Ltd. , Beijing 101400 , People's Republic of China
| | - Xiaodong Wen
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry , Chinese Academy of Sciences , Taiyuan 030001 , People's Republic of China
- National Energy Research Center for Clean Fuels , Synfuels China Co., Ltd. , Beijing 101400 , People's Republic of China
| | - Yong Yang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry , Chinese Academy of Sciences , Taiyuan 030001 , People's Republic of China
- National Energy Research Center for Clean Fuels , Synfuels China Co., Ltd. , Beijing 101400 , People's Republic of China
| | - Yongwang Li
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry , Chinese Academy of Sciences , Taiyuan 030001 , People's Republic of China
- National Energy Research Center for Clean Fuels , Synfuels China Co., Ltd. , Beijing 101400 , People's Republic of China
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Zhou W, Liu J, Lin L, Zhang X, He N, Liu C, Guo H. Enhanced Dehydrogenative Aromatization of Propane by Incorporating Fe and Pt into the Zn/HZSM-5 Catalyst. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b03865] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wei Zhou
- State Key Laboratory of Fine Chemicals & School of Chemical Engineering, Dalian University of Technology, Dalian 116012, P. R. China
| | - Jiaxu Liu
- State Key Laboratory of Fine Chemicals & School of Chemical Engineering, Dalian University of Technology, Dalian 116012, P. R. China
| | - Long Lin
- State Key Laboratory of Fine Chemicals & School of Chemical Engineering, Dalian University of Technology, Dalian 116012, P. R. China
| | - Xiaotong Zhang
- State Key Laboratory of Fine Chemicals & School of Chemical Engineering, Dalian University of Technology, Dalian 116012, P. R. China
| | - Ning He
- State Key Laboratory of Fine Chemicals & School of Chemical Engineering, Dalian University of Technology, Dalian 116012, P. R. China
| | - Chunyan Liu
- State Key Laboratory of Fine Chemicals & School of Chemical Engineering, Dalian University of Technology, Dalian 116012, P. R. China
| | - Hongchen Guo
- State Key Laboratory of Fine Chemicals & School of Chemical Engineering, Dalian University of Technology, Dalian 116012, P. R. China
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Feng Li, Liang J, Wang K, Cao B, Song H. Fe-Promoted Pt-Fe/Al2O3 Catalyst Prepared by Microemulsion Technique for m-Chloronitrobenzene Hydrogenation. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2018. [DOI: 10.1134/s0036024418070117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ma Z, Hu H, Sun Z, Fang W, Zhang J, Yang L, Zhang Y, Wang L. Acidic Zeolite L as a Highly Efficient Catalyst for Dehydration of Fructose to 5-Hydroxymethylfurfural in Ionic Liquid. CHEMSUSCHEM 2017; 10:1669-1674. [PMID: 28272798 DOI: 10.1002/cssc.201700239] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 03/06/2017] [Indexed: 06/06/2023]
Abstract
Zeolite L was synthesized by the hydrothermal method and post-treated by NH4 exchange to adjust its acidity. The samples were systematic characterized by various techniques including XRD, X-ray fluorescence spectroscopy, N2 adsorption-desorption, scanning electron microscopy, pyridine IR spectroscopy, and NH3 temperature-programmed desorption. The results demonstrated that the NH4 -exchange post-treatment increased the surface area, micropore volume, and acidity of zeolite L. The catalytic performance of the samples was tested in the dehydration of fructose to 5-hydroxymethylfurfural (HMF) in ionic liquid (1-butyl-3-methylimidazolium bromide, [bmim]Br). 99.1 % yield of HMF was obtained when the KL-80 °C-1 h sample (KL zeolite treated with 1 m NH4 NO3 solution at 80 °C for 1 h) was used. The high efficiency could be attributed to the appropriate acid properties of the catalyst. The zeolite catalyst could be reused four times without significant decrease in activity.
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Affiliation(s)
- Zhongsen Ma
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China
| | - Hualei Hu
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China
| | - Zhongqiang Sun
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China
| | - Wenting Fang
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China
| | - Jian Zhang
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China
| | - Longfei Yang
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China
| | - Yajie Zhang
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China
| | - Lei Wang
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China
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El-Molla SA, Mahmoud HR. Effect of compacting, recycling and Ag+ ion-doping on the physicochemical and catalytic properties of FeMgO nanoparticles. POWDER TECHNOL 2014. [DOI: 10.1016/j.powtec.2013.12.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Visser T, Nijhuis TA, van der Eerden AMJ, Jenken K, Ji Y, Bras W, Nikitenko S, Ikeda Y, Lepage M, Weckhuysen BM. Promotion effects in the oxidation of CO over zeolite-supported Pt nanoparticles. J Phys Chem B 2007; 109:3822-31. [PMID: 16851431 DOI: 10.1021/jp044767f] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Well-defined Pt-nanoparticles with an average diameter of 1 nm supported on a series of zeolite Y samples containing different monovalent (H+, Na+, K+, Rb+, and Cs+) and divalent (Mg2+, Ca2+, Sr2+, and Ba2+) cations have been used as model systems to investigate the effect of promotor elements in the oxidation of CO in excess oxygen. Time-resolved infrared spectroscopy measurements allowed us to study the temperature-programmed desorption of CO from supported Pt nanoparticles to monitor the electronic changes in the local environment of adsorbed CO. It was found that the red shift of the linear Pt-coordinated CO vibration compared to that of gas-phase CO increases with an increasing cation radius-to-charge ratio. In addition, a systematic shift from linear (L) to bridge (B) bonded CO was observed for decreasing Lewis acidity, as expressed by the Kamlet-Taft parameter alpha. A decreasing alpha results in an increasing electron charge on the framework oxygen atoms and therefore an increasing electron charge on the supported Pt nanoparticles. This observation was confirmed with X-ray absorption spectroscopy, and the intensity of the experimental Pt atomic XAFS correlates with the Lewis acidity of the cation introduced. Furthermore, it was found that the CO coverage increases with increasing electron density on the Pt nanoparticles. This increasing electron density was found to result in an increased CO oxidation activity; i.e., the T(50%) for CO oxidation decreases with decreasing alpha. In other words, basic promotors facilitate the chemisorption of CO on the Pt particles. The most promoted CO oxidation catalyst is a Pt/K-Y sample, which has a T(50%) of 390 K and a L:B intensity ratio of 2.7. The obtained results provide guidelines to design improved CO oxidation catalysts.
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Affiliation(s)
- Tom Visser
- Department of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, Sorbonnelaan 16, 3584 CA Utrecht, The Netherlands
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Promotion effects in the oxidation of CO over zeolite-supported Pt nanoparticles. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s0167-2991(05)80470-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Magnetic properties and oxidation state of iron in bimetallic Pt-Fe/KL zeolite catalysts. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1381-1169(02)00522-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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