Methanol to propylene reaction over zeolite catalysts with different topologies

HU Si; GONG Yanjun; ZHANG Qing; ZHANG Junliang; ZHANG Yafei; YANG Feiying; DOU Tao

doi:10.3969/j.issn.0438-1157.2012.12.022

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Methanol to propylene reaction over zeolite catalysts with different topologies

更新时间：2025-12-10

- Methanol to propylene reaction over zeolite catalysts with different topologies
- CIESC Journal Issue 12, Pages: 3889-3896(2012)
- 作者机构：
  
  中国石油大学(北京)重质油加工国家重点实验室, CNPC催化重点实验室,北京,102249
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.12.022
  CLC： 643.3
- Online First：07 August 2012，
  
  Published：07 August 2012
- 稿件说明：
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HU Si, GONG Yanjun, ZHANG Qing, et al. Methanol to propylene reaction over zeolite catalysts with different topologies[J]. CIESC Journal, 2012, (12): 3889-3896.
DOI：

HU Si, GONG Yanjun, ZHANG Qing, et al. Methanol to propylene reaction over zeolite catalysts with different topologies[J]. CIESC Journal, 2012, (12): 3889-3896. DOI： 10.3969/j.issn.0438-1157.2012.12.022.

摘要

在常压、空速为1.5 h-1、反应温度为450℃条件下

考察了4种具有不同拓扑结构的分子筛(SAPO-34、ZSM-48、ZSM-5和beta)在甲醇转化制丙烯(MTP)反应中的催化性能

并对催化剂的积炭失活行为进行了研究。结果表明

从8元环到12元环

分子筛孔口尺寸越小

低碳烯烃(乙烯+丙烯)选择性越高

积炭失活速率也越快。孔道尺寸越大

丙烯/乙烯(P/E)比越高

但产物分布向C4以上组分偏移

丙烯选择性降低。10元环分子筛具有较高的丙烯选择性

但催化剂的积炭失活速率随孔道体系的不同有很大差异。一维直通孔道的ZSM-48容易积炭失活

而具有三维交叉孔结构的ZSM-5表现出了优异的抗积炭失活性能。不同结构分子筛在MTP反应中催化性能的差异主要归因于分子筛的过渡态择形和产物择形作用的不同。

Abstract

Conversion of methanol to propylene(MTP)was comparatively studied over four zeolites with different topologies

em.e.SAPO-34

ZSM-48

ZSM-5 and beta at atmospheric pressure

450℃ and WHSV=1.5 h-1.The correlations between product selectivity

catalyst stability and zeolite topology were investigated.Besides

coking behavior of the four zeolite catalysts during the reaction was also discussed.Among the studied catalysts

SAPO-34 with narrow 8-member ring openings showed the highest selectivity to light olefins(ethylene and propylene).However

it seems that the high density of acid site and the large cages of SAPO-34 resulted in an extremely fast coking deactivation.Beta zeolite with wide pore structure exhibited high propylene/ethylene(P/E)ratio

but the propylene selectivity was somewhat low due to the product distribution shifting towards heavier hydrocarbons.In contrast

ZSM-48 and ZSM-5 zeolite with 10-member ring openings gave higher propylene selectivity

but their deactivation rates were quite different.ZSM-48 zeolite with symmetrical straight channels underwent fast deactivation after a few hours on stream

while ZSM-5 zeolite with intersecting channel system presented superior resistance to coke deactivation.The significant difference in catalytic performance of the four zeolites could be mainly ascribed to the combined effect of shape selectivity for intermediates and products controlled by zeolites topology.

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