Citation: Jiawei Zhong, Jingfeng Han, Yingxu Wei, Shutao Xu, Tantan Sun, Xinwen Guo, Chunshan Song, Zhongmin Liu. Enhancing ethylene selectivity in MTO reaction by incorporating metal species in the cavity of SAPO-34 catalysts[J]. Chinese Journal of Catalysis, ;2018, 39(11): 1821-1831. doi: 10.1016/S1872-2067(18)63141-9 shu

Enhancing ethylene selectivity in MTO reaction by incorporating metal species in the cavity of SAPO-34 catalysts

Jiawei Zhong ^a,b,d, ,
Jingfeng Han ^b ,
Yingxu Wei ^b ,
Shutao Xu ^b ,
Tantan Sun ^b ,
Xinwen Guo ^a ,
Chunshan Song ^a,c ,
Zhongmin Liu ^b

a State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;
b National Engineering Laboratory for Methanol to Olefins, State Energy Low Carbon Catalysis and Engineering R & D Center, Dalian National Laboratory for Clean Energy, iChEM(Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
c EMS Energy Institute, Departments of Energy and Mineral Engineering, and of Chemical Engineering, Pennsylvania State University, University Park, PA 16802, USA;
d University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 8 June 2018
Revised Date: 23 July 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (21603223, 91745109, 91545104, 21473182), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (2014165), and the Key Research Program of Frontier Sciences, CAS (QYZDY-SSW-JSC024).

The SAPO-34 catalysts were modified with metal cations by different processes (conventional ion exchange (CIE), template-assisted ion incorporation (TⅡ) and alcoholic ion exchange (AIE)), systematically characterized by XRD, XRF, N₂ adsorption-desorption, UV-VIS, H₂-TPR, EPR, SEM, EDX, XPS, NH₃-TPD, ¹H NMR and IGA, and applied in MTO reaction. The metal cations incorporation introduces extra diffusion hindrance by metallic species located in the cavity of SAPO-34. In particular, the Zn cations-modified SAPO-34 catalysts exhibit core-shell like structure, with Si-rich and Zn-rich sublayer near the external surface, which favors the coke deposition at the beginning of MTO reaction, exerts marked impact on the diffusion of the generated products with relatively large molecular size (e.g. propylene), and significantly increases the selectivity to ethylene and the ratio of ethylene to propene in the MTO reaction.
- Methanol to olefin (MTO),
- Product selectivity,
- Metal modification,
- Diffusion hindrance,
- Core-shell like
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