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Recent Advances in Multifunctional Capsule Catalysts in Heterogeneous Catalysis
Xin-hua Gao,Qing-xiang Ma,Tian-sheng Zhao,Jun Bao,Noritatsu Tsubaki*
Author NameAffiliationE-mail
Xin-hua Gao State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry & Chemical Engineering, Ningxia University, Yinchuan 750021, China  
Qing-xiang Ma State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry & Chemical Engineering, Ningxia University, Yinchuan 750021, China  
Tian-sheng Zhao State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry & Chemical Engineering, Ningxia University, Yinchuan 750021, China  
Jun Bao National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China  
Noritatsu Tsubaki* Department of Applied Chemistry, School of Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan tsubaki@eng.u-toyama.ac.jp 
Abstract:
Capsule catalysts composed of pre-shaped core catalysts and layer zeolites have been widely used in the tandem reactions where multiple continuous reactions are combined into one process. They show excellent catalytic performance in heterogeneous catalysis, including the direct synthesis of middle isoparaffins or dimethyl ether from syngas, as compared to the conventional hybrid catalysts. The present review highlights the recent development in the design of capsule catalysts and their catalytic applications in heterogeneous catalysis. The capsule catalyst preparation methods are introduced in detail, such as hydrothermal synthesis method, dual-layer method, physically adhesive method and single crystal crystallization method. Furthermore, several new applications of capsule catalysts in heterogeneous catalytic processes are presented such as in the direct synthesis of liquefied petroleum gas from syngas, the direct synthesis of para-xylene from syngas and methane dehydroaromatization. In addition, the development in the design of multifunctional capsule catalysts is discussed, which makes the capsule catalyst not just a simple combination of two different catalysts, but has some special functions such as changing the surface hydrophobic or acid properties of the core catalysts. Finally, the future perspectives of the design and applications of capsule catalysts in heterogeneous catalysis are provided.
Key words:  Capsule catalyst  Tandem reaction  Zeolite  Heterogeneous catalysis
FundProject:The work was supported by the Key R & D plan (East-West Cooperation) of Ningxia and the First-rate Discipline Construction Project of Ningxia (NXYLXK2017A04).
多功能胶囊催化剂在多相催化中的应用研究进展
高新华,马清祥,赵天生,鲍骏,椿范立*
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DOI:10.1063/1674-0068/31/cjcp1805129
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