Distribution of active silver species of Ag/TS-1 catalyst on direct gas-phase epoxidation of propylene

WANG Ruipu; GUO Xinwen; WANG Xiangsheng; WANG Chuanfu; HAO Jingquan

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Distribution of active silver species of Ag/TS-1 catalyst on direct gas-phase epoxidation of propylene

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- Distribution of active silver species of Ag/TS-1 catalyst on direct gas-phase epoxidation of propylene
- CIESC Journal Issue 8, Pages: 1484-1491(2005)
- 作者机构：
  
  大连理工大学精细化工国家重点实验室, 催化化学与工程系,辽宁,大连,116012
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 August 2005，
  
  Published：25 August 2005
- 稿件说明：
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WANG Ruipu, GUO Xinwen, WANG Xiangsheng, et al. Distribution of active silver species of Ag/TS-1 catalyst on direct gas-phase epoxidation of propylene[J]. CIESC Journal, 2005, (8): 1484-1491.
DOI：

WANG Ruipu, GUO Xinwen, WANG Xiangsheng, et al. Distribution of active silver species of Ag/TS-1 catalyst on direct gas-phase epoxidation of propylene[J]. CIESC Journal, 2005, (8): 1484-1491. DOI：

摘要

在常压固定床、石英反应器中，以丙烯直接气相氧化反应为探针，考察了硅烷化处理及TS-1中模板剂对Ag/TS-1催化性能的影响.同时，采用UV-Vis、ICP和TEM等手段对其进行了表征.结果表明：在丙烯直接气相氧化过程中，载体TS-1硅烷化后所制备的Ag/TS-1的催化性能增强.通过硅烷化处理负载2%SiO2，制备的Ag/TS-1的丙烯转化率可达2.1%，环氧丙烷选择性98.4%.用TS-1原粉（含有模板剂）所制备的Ag/TS-1不具有环氧化性能.分子筛内外表面的银物种均具有环氧化性能，但内表面的银物种在丙烯气相氧化过程中起决定性的作用.

Abstract

The effects of silylation treatment and the template of TS-1 on the catalytic properties of Ag/TS-1 were investigated in a fixed bed

quartz reactor at ambient pressure

using the gas-phase epoxidation of propylene with hydrogen and oxygen as a probe. Moreover

the catalysts were characterized by UV-Vis

ICP and TEM.The results showed that

during the direct gas-phase epoxidation of propylene

the catalytic properties of Ag/TS-1 could be improved when TS-1 was silylanized.When 2%SiO2 was loaded on TS-1

2.1% propylene conversion with 98.4% selectivity to propylene oxide (PO) was obtained over Ag/TS-1. The Ag/TS-1 did not show any catalytic selectivity to PO

when the TS-1 powder (with template) was used as the support. Both inner and outer silver species of Ag/TS-1 showed catalytic properties

however

the inner ones were the key active species in the gas-phase epoxidation of propylene.

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