The guiding role of pre-coking on the coke deposition over ZSM-5 in methanol to propylene | Zendy

Lin Wang | Zendy; Jing Qi | Zendy; Jiao Hongqiao | Zendy; Liangcheng An | Zendy; Guan Chong | Zendy; Yong Xiaojing | Zendy; Zhengwei Jin | Zendy; Angui Zhang | Zendy; Dianhua Liu | Zendy

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The guiding role of pre-coking on the coke deposition over ZSM-5 in methanol to propylene

Author(s) -

Lin Wang,

Jing Qi,

Jiao Hongqiao,

Liangcheng An,

Guan Chong,

Yong Xiaojing,

Zhengwei Jin,

Angui Zhang,

Dianhua Liu

Publication year - 2019

Publication title -

royal society open science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.84

H-Index - 51

ISSN - 2054-5703

DOI - 10.1098/rsos.190218

Subject(s) - coke , thermogravimetric analysis , methanol , selectivity , zsm 5 , chemical engineering , chemistry , deposition (geology) , organic chemistry , materials science , catalysis , zeolite , paleontology , sediment , engineering , biology

Deposition of carbonaceous compounds was used to improve the propylene selectivity of ZSM-5 by deactivating some acid sites meanwhile maintaining the high activity for methanol conversion. The carbonaceous species of pre-coked samples before and after MTP reactions were investigated by elementary analysis and thermogravimetric analysis (TGA). The results showed that pre-coke formed at low temperature (250°C) was unstable and easy to transform into polyaromatics species at the high reacting temperature, while combining 5% pre-coking process with 95% steam treatment at high temperature (480°C) was effective in inhibiting the formation of coke deposits and presented a significant improvement in the propylene selectivity.

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