TY - JOUR
T1 - Enhancing ethylene selectivity in MTO reaction by incorporating metal species in the cavity of SAPO-34 catalysts
AU - Zhong, Jiawei
AU - Han, Jingfeng
AU - Wei, Yingxu
AU - Xu, Shutao
AU - Sun, Tantan
AU - Guo, Xinwen
AU - Song, Chunshan
AU - Liu, Zhongmin
N1 - Publisher Copyright:
"© 2018, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved. "
PY - 2018/11/1
Y1 - 2018/11/1
N2 - 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.
AB - 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.
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U2 - 10.1016/S1872-2067(18)63141-9
DO - 10.1016/S1872-2067(18)63141-9
M3 - Article
AN - SCOPUS:85053021102
SN - 0253-9837
VL - 39
SP - 1821
EP - 1831
JO - Cuihua Xuebao/Chinese Journal of Catalysis
JF - Cuihua Xuebao/Chinese Journal of Catalysis
IS - 11
ER -