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Tian Y, Duan H, Zhang B, Gong S, Lu Z, Dai L, Qiao C, Liu G, Zhao Y. Template Guiding for the Encapsulation of Uniformly Subnanometric Platinum Clusters in Beta‐Zeolites Enabling High Catalytic Activity and Stability. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202108059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yajie Tian
- Henan Province Engineering Research Centre of Catalytic Reaction College of Chemistry and Chemical Engineering Henan University Jinming Road Kaifeng 475004 China
- Key Lab for Special Functional Materials of Ministry of Education School of Materials Science and Engineering Henan University Jinming Road Kaifeng 475004 China
| | - Haonan Duan
- Henan Province Engineering Research Centre of Catalytic Reaction College of Chemistry and Chemical Engineering Henan University Jinming Road Kaifeng 475004 China
| | - Bofeng Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Weijin Road 92 Tianjin 300072 China
| | - Siyuan Gong
- Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Weijin Road 92 Tianjin 300072 China
| | - Zongjing Lu
- Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Weijin Road 92 Tianjin 300072 China
| | - Lei Dai
- Key Lab for Special Functional Materials of Ministry of Education School of Materials Science and Engineering Henan University Jinming Road Kaifeng 475004 China
| | - Congzhen Qiao
- Henan Province Engineering Research Centre of Catalytic Reaction College of Chemistry and Chemical Engineering Henan University Jinming Road Kaifeng 475004 China
| | - Guozhu Liu
- Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Weijin Road 92 Tianjin 300072 China
| | - Yong Zhao
- Key Lab for Special Functional Materials of Ministry of Education School of Materials Science and Engineering Henan University Jinming Road Kaifeng 475004 China
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Tian Y, Duan H, Zhang B, Gong S, Lu Z, Dai L, Qiao C, Liu G, Zhao Y. Template Guiding for the Encapsulation of Uniformly Subnanometric Platinum Clusters in Beta-Zeolites Enabling High Catalytic Activity and Stability. Angew Chem Int Ed Engl 2021; 60:21713-21717. [PMID: 34350671 DOI: 10.1002/anie.202108059] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Indexed: 11/08/2022]
Abstract
Subnanometric metal clusters have attracted extensive attention because of their unique properties as heterogeneous catalysts. However, it is challenging to obtain uniformly distributed metal clusters under synthesis and reaction conditions. Herein, we report a template-guidance protocol to synthesize subnanometric metal clusters uniformly encapsulated in beta-zeolite, with the metal ions anchored to the internal channels of the zeolite template via electrostatic interactions. Pt metal clusters with a narrow size range of 0.89 to 1.22 nm have been obtained on the intersectional sites of beta-zeolite (Pt@beta) with a broad range of Si/Al molar ratios (15-200). The uniformly distributed Pt clusters in Pt@H-beta are subject to strong electron withdrawal by the zeolite, which promotes transfer of active hydrogen, providing excellent activity and stability in hydrodeoxygenation reactions. A general strategy is thus proposed for the encapsulation of subnanometric metal clusters in zeolites with high thermal stability.
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Affiliation(s)
- Yajie Tian
- Henan Province Engineering Research Centre of Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Jinming Road, Kaifeng, 475004, China.,Key Lab for Special Functional Materials of Ministry of Education, School of Materials Science and Engineering, Henan University, Jinming Road, Kaifeng, 475004, China
| | - Haonan Duan
- Henan Province Engineering Research Centre of Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Jinming Road, Kaifeng, 475004, China
| | - Bofeng Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Siyuan Gong
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Zongjing Lu
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Lei Dai
- Key Lab for Special Functional Materials of Ministry of Education, School of Materials Science and Engineering, Henan University, Jinming Road, Kaifeng, 475004, China
| | - Congzhen Qiao
- Henan Province Engineering Research Centre of Catalytic Reaction, College of Chemistry and Chemical Engineering, Henan University, Jinming Road, Kaifeng, 475004, China
| | - Guozhu Liu
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Yong Zhao
- Key Lab for Special Functional Materials of Ministry of Education, School of Materials Science and Engineering, Henan University, Jinming Road, Kaifeng, 475004, China
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Quasielastic Neutron Scattering and Molecular Dynamics Simulation Study on the Molecular Behaviour of Catechol in Zeolite Beta. Top Catal 2020. [DOI: 10.1007/s11244-020-01400-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractThe dynamics of catechol in zeolite Beta was studied using quesielastic neutron scattering (QENS) experiments and molecular dynamics simulations at 393 K, to understand the behaviour of phenolic monomers relevant in the catalytic conversion of lignin via metal nanoparticles supported on zeolites. Compared to previous work studying phenol, both methods observe that the presence of the second OH group in catechol can hinder mobility significantly, as explained by stronger hydrogen-bonding interactions between catechol and the Brønsted sites of the zeolite. The instrumental timescale of the QENS experiment allows us to probe rotational motion, and the catechol motions are best fit to an isotropic rotation model with a $$D^{rot}$$
D
rot
of 2.9 × 10$$^{10}$$
10
s$$^{-1}$$
-
1
. While this $$D^{rot}$$
D
rot
is within error of that measured for phenol, the fraction of molecules immobile on the instrumental timescale is found to be significantly higher for catechol. The MD simulations also exhibit this increased in ‘immobility’, showing that the long-range translational diffusion coefficients of catechol are lower than phenol by a factor of 7 in acidic zeolite Beta, and a factor of $$\sim$$
∼
3 in the siliceous material, further illustrating the significance of Brønsted site H-bonding. Upon reproducing QENS observables from our simulations to probe rotational motions, a combination of two isotropic rotations was found to fit the MD-calculated EISF; one corresponds to the free rotation of catechol in the pore system of the zeolite, while the second rotation is used to approximate a restricted and rapid “rattling”, consistent with molecules anchored to the acid sites through their OH groups, the motion of which is too rapid to be observed by experiment.
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Influence of Topology and Brønsted Acid Site Presence on Methanol Diffusion in Zeolites Beta and MFI. Catalysts 2020. [DOI: 10.3390/catal10111342] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Detailed insight into molecular diffusion in zeolite frameworks is crucial for the analysis of the factors governing their catalytic performance in methanol-to-hydrocarbons (MTH) reactions. In this work, we present a molecular dynamics study of the diffusion of methanol in all-silica and acidic zeolite MFI and Beta frameworks over the range of temperatures 373–473 K. Owing to the difference in pore dimensions, methanol diffusion is more hindered in H-MFI, with diffusion coefficients that do not exceed 10 × 10−10 m2s−1. In comparison, H-Beta shows diffusivities that are one to two orders of magnitude larger. Consequently, the activation energy of translational diffusion can reach 16 kJ·mol−1 in H-MFI, depending on the molecular loading, against a value for H-Beta that remains between 6 and 8 kJ·mol−1. The analysis of the radial distribution functions and the residence time at the Brønsted acid sites shows a greater probability for methylation of the framework in the MFI structure compared to zeolite Beta, with the latter displaying a higher prevalence for methanol clustering. These results contribute to the understanding of the differences in catalytic performance of zeolites with varying micropore dimensions in MTH reactions.
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O'Malley AJ, García Sakai V, Dimitratos N, Jones W, Catlow C, Parker SF. Octane isomer dynamics in H-ZSM-5 as a function of Si/Al ratio: a quasi-elastic neutron scattering study. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2020; 378:20200063. [PMID: 32623986 PMCID: PMC7422888 DOI: 10.1098/rsta.2020.0063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/20/2020] [Indexed: 06/11/2023]
Abstract
Dynamical behaviour of n-octane and 2,5-dimethylhexane in H-ZSM-5 zeolite catalysts of differing Si/Al ratios (15 and 140) was probed using quasi-elastic neutron scattering, to understand molecular shape and Brønsted acid site density effects on the behaviour of common species in the fluid catalytic cracking (FCC) process, where H-ZSM-5 is an additive catalyst. Between 300 and 400 K, n-octane displayed uniaxial rotation around its long axis. However, the population of mobile molecules was larger in H-ZSM-5(140), suggesting that the lower acid site concentration allows for more molecules to undergo rotation. The rotational diffusion coefficients were higher in H-ZSM-5(140), reflecting this increase in freedom. 2,5-dimethylhexane showed qualitative differences in behaviour to n-octane, with no full molecule rotation, probably due to steric hindrance in the constrictive channels. However, methyl group rotation in the static 2,5-dimethylhexane molecules was observed, with lower mobile fractions in H-ZSM-5(15), suggesting that this rotation is less hindered when fewer Brønsted sites are present. This was further illustrated by the lower activation barrier calculated for methyl rotation in H-ZSM-5(140). We highlight the significant immobilizing effect of isomeric branching in this important industrial catalyst and show how compositional changes of the zeolite can affect a range of dynamical behaviours of common FCC species upon adsorption. This article is part of a discussion meeting issue 'Science to enable the circular economy'.
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Affiliation(s)
- Alexander J. O'Malley
- Centre for Sustainable and Circular Technologies, Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK
- UK Catalysis Hub, Research Complex at Harwell, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, UK
| | - Victoria García Sakai
- ISIS Pulsed Neutron and Muon Facility, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, UK
| | - Nikolaos Dimitratos
- Dipartimento di Chimica Industriale e dei Materiali, ALMA MATER STUDIORUM, Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
| | - Wilm Jones
- UK Catalysis Hub, Research Complex at Harwell, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, UK
- Department of Chemistry, University College London, 20 Gordon St., London WC1 HOAJ, UK
| | - C. Richard A. Catlow
- UK Catalysis Hub, Research Complex at Harwell, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, UK
- Cardiff Catalysis Department, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK
- Department of Chemistry, University College London, 20 Gordon St., London WC1 HOAJ, UK
| | - Stewart F. Parker
- UK Catalysis Hub, Research Complex at Harwell, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, UK
- ISIS Pulsed Neutron and Muon Facility, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, UK
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