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Zhang P, Wang X, Yi X, Ou Q, Xia C, Peng X, Zhang X, Zheng A, Luo Y, Shu X. Modulating the Microenvironment of Silanols in Pure-Silicon Zeolites for Boosting Vapor-phase Beckmann Rearrangement of Cyclohexanone Oxime. ACS APPLIED MATERIALS & INTERFACES 2023; 15:40478-40487. [PMID: 37591494 DOI: 10.1021/acsami.3c07016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/19/2023]
Abstract
Vapor-phase Beckmann rearrangement of cyclohexanone oxime (CHO) to ε-caprolactam (CPL) is still difficult to commercialize at the industrial scale due to its relatively low catalytic activity and poor lifetime. Herein, we synthesized a series of pure-silicon zeolites (including MFI, MEL, and -SVR) with three-dimensional 10-member-ring topolgies, diverse silanol status, and hierarchical porosity to investigate the synergistic effects of inner diffusivity and reactivity. S-1 zeolite of MFI-type topology with plentiful silanol nests exhibits a more preferable catalytic performance in terms of CHO conversion (99.7%) and CPL selectivity (89.7%), much higher than those of MEL- and -SVR-type zeolites mainly due to their diverse silanol distribution. With the construction of hierarchical porosity, S-1-P shows improved CPL selectivity of 94.1% owing to the enhanced diffusivity to shorten the retention time of the reactant and product molecules. The reaction mechanism and network have been further revealed by density functional theory (DFT) calculations and experimental designs, which indicate that silanol nests are major active sites due to their suitable interaction with CHO rather than terminal silanols. Particularly, the microenvironments of silanols can be modulated by alcohol solvents, ascribed to their different charge transfer and steric hindrance. Consequently, S-1-P shows superior CPL selectivity of 97.3% in ethonal solvents, which have higher adsorb energy of -0.627 eV with silanol nests than other alcohols. The present study not only provides a fundamental guide for the design of zeolite catalysts but also provides a reference for modulating the microenvironment of active sites according to the catalytic mechanism.
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Affiliation(s)
- Peng Zhang
- State Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, P.R. China
| | | | - Xianfeng Yi
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, P.R. China
| | - Qi Ou
- DP Technology, Beijing 100080, P.R. China
| | - Changjiu Xia
- State Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, P.R. China
| | - Xinxin Peng
- State Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, P.R. China
| | - Xiaoxin Zhang
- State Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, P.R. China
| | - Anmin Zheng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, P.R. China
| | - Yibin Luo
- State Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, P.R. China
| | - Xingtian Shu
- State Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, P.R. China
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Zhang S, Zhang X, Dong L, Zhu S, Yuan Y, Xu L. In situ synthesis of Pt nanoparticles encapsulated in Silicalite-1 zeolite via a steam-assisted dry-gel conversion method. CrystEngComm 2022. [DOI: 10.1039/d1ce01718g] [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
In this work, Pt nanoparticles (NPs) were directly encapsulated into MFI-type zeolite (Pt@S-1) via a steam-assisted dry-gel conversion method. The synthesis process included the disaggregation of Pt immobilized SiO2-SH spheres...
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Xu L, Yuan Y, Zhang J, Zhang Y, Zhang X, Chen L, Xu L. In situ fabrication of core–shell-structured Beta@Silicalite-1 catalysts by a novel steam-assisted crystallization strategy. CrystEngComm 2020. [DOI: 10.1039/c9ce01624d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A green and efficient steam-assisted crystallization (SAC) strategy was employed to synthesize a core–shell zeolite with different frameworks between the core and shell, Beta@Silicalite-1.
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Affiliation(s)
- Lanjian Xu
- National Laboratory for Clean Energy
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian 116023
- People's Republic of China
| | - Yangyang Yuan
- National Laboratory for Clean Energy
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian 116023
- People's Republic of China
| | - Jie Zhang
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
- People's Republic of China
| | - Yanfei Zhang
- National Laboratory for Clean Energy
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian 116023
- People's Republic of China
| | - Xiaomin Zhang
- National Laboratory for Clean Energy
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian 116023
- People's Republic of China
| | - Lei Chen
- National Laboratory for Clean Energy
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian 116023
- People's Republic of China
| | - Lei Xu
- National Laboratory for Clean Energy
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian 116023
- People's Republic of China
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Weissenberger T, Leonhardt R, Zubiri BA, Pitínová-Štekrová M, Sheppard TL, Reiprich B, Bauer J, Dotzel R, Kahnt M, Schropp A, Schroer CG, Grunwaldt JD, Casci JL, Čejka J, Spiecker E, Schwieger W. Synthesis and Characterisation of Hierarchically Structured Titanium Silicalite-1 Zeolites with Large Intracrystalline Macropores. Chemistry 2019; 25:14430-14440. [PMID: 31478582 DOI: 10.1002/chem.201903287] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 09/02/2019] [Indexed: 12/30/2022]
Abstract
The successful synthesis of hierarchically structured titanium silicalite-1 (TS-1) with large intracrystalline macropores by steam-assisted crystallisation of mesoporous silica particles is reported. The macropore topology was imaged in 3D by using electron tomography and synchrotron radiation-based ptychographic X-ray computed tomography, revealing interconnected macropores within the crystals accounting for about 30 % of the particle volume. The study of the macropore formation mechanism revealed that the mesoporous silica particles act as a sacrificial macropore template during the synthesis. Silicon-to-titanium ratio of the macroporous TS-1 samples was successfully tuned from 100 to 44. The hierarchically structured TS-1 exhibited high activity in the liquid phase epoxidation of 2-octene with hydrogen peroxide. The hierarchically structured TS-1 surpassed a conventional nano-sized TS-1 sample in terms of alkene conversion and showed comparable selectivity to the epoxide. The flexible synthesis route described here can be used to prepare hierarchical zeolites with improved mass transport properties for other selective oxidation reactions.
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Affiliation(s)
- Tobias Weissenberger
- Institute of Chemical Reaction Engineering, University of Erlangen-Nuremberg, Egerlandstr. 3, 91058, Erlangen, Germany
| | - Rainer Leonhardt
- Institute of Chemical Reaction Engineering, University of Erlangen-Nuremberg, Egerlandstr. 3, 91058, Erlangen, Germany
| | - Benjamin Apeleo Zubiri
- Institute of Micro- and Nanostructure Research (IMN) &, Center for Nanoanalysis and Electron Microscopy (CENEM), University of Erlangen-Nuremberg, Cauerstr. 6, 91058, Erlangen, Germany
| | - Martina Pitínová-Štekrová
- J. Heyrovsky Institute of Physical Chemistry, Czech Academy of Sciences, Dolejškova 2155/3, 18223, Prague 8, Czech Republic
| | - Thomas L Sheppard
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.,Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstr. 20, 76131, Karlsruhe, Germany
| | - Bastian Reiprich
- Institute of Chemical Reaction Engineering, University of Erlangen-Nuremberg, Egerlandstr. 3, 91058, Erlangen, Germany
| | - Jürgen Bauer
- Johnson Matthey Catalysts (Germany) GmbH, Bahnhofstr. 43, 96257, Redwitz, Germany
| | - Ralf Dotzel
- Johnson Matthey Catalysts (Germany) GmbH, Bahnhofstr. 43, 96257, Redwitz, Germany
| | - Maik Kahnt
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany.,Department Physik, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - Andreas Schropp
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - Christian G Schroer
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany.,Department Physik, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - Jan-Dierk Grunwaldt
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.,Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstr. 20, 76131, Karlsruhe, Germany
| | - John L Casci
- Johnson Matthey Technology Centre, PO Box 1, Belasis Avenue, Billingham, TS23 1LB, UK
| | - Jiří Čejka
- Department of Physical and Macromolecular Chemistry, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Erdmann Spiecker
- Institute of Micro- and Nanostructure Research (IMN) &, Center for Nanoanalysis and Electron Microscopy (CENEM), University of Erlangen-Nuremberg, Cauerstr. 6, 91058, Erlangen, Germany
| | - Wilhelm Schwieger
- Institute of Chemical Reaction Engineering, University of Erlangen-Nuremberg, Egerlandstr. 3, 91058, Erlangen, Germany
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