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

Abstract:

: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.

journal_name

R Soc Open Sci

authors

Wang L,Qi J,Jiao H,An L,Guan C,Yong X,Jin Z,Zhang A,Liu D

doi

10.1098/rsos.190218

subject

Has Abstract

pub_date

2019-09-04 00:00:00

pages

190218

issue

9

issn

2054-5703

pii

rsos190218

journal_volume

6

pub_type

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