Direct synthesis of W-SBA-15 catalysts and their catalytic performance for metathesis of ethylene and 2-butene to propylene

ZHAO Qinfeng; CHEN Shengli; GAO Jinsen; XU Chunming; LI Dongyu; ZHAO Zhen

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Direct synthesis of W-SBA-15 catalysts and their catalytic performance for metathesis of ethylene and 2-butene to propylene

更新时间：2025-12-10

- Direct synthesis of W-SBA-15 catalysts and their catalytic performance for metathesis of ethylene and 2-butene to propylene
- CIESC Journal Issue 1, Pages: 75-82(2009)
- 作者机构：
  
  中国石油大学（北京）重质油国家重点实验室
- 作者简介：
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- Online First：05 January 2009，
  
  Published：05 January 2009
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ZHAO Qinfeng, CHEN Shengli, GAO Jinsen, et al. Direct synthesis of W-SBA-15 catalysts and their catalytic performance for metathesis of ethylene and 2-butene to propylene[J]. CIESC Journal, 2009, (1): 75-82.
DOI：

ZHAO Qinfeng, CHEN Shengli, GAO Jinsen, et al. Direct synthesis of W-SBA-15 catalysts and their catalytic performance for metathesis of ethylene and 2-butene to propylene[J]. CIESC Journal, 2009, (1): 75-82. DOI：

摘要

以Na2WO4为钨源，以正硅酸乙酯为硅源，采用直接水热法合成了W-SBA-15介孔分子筛，并用XRD、N2吸附、HRTEM、UV-Vis DRS、NH3-TPD、H2-TPR等手段对合成的分子筛进行了表征。表征结果表明，当分子筛中硅钨摩尔比为44时，钨物种以高度分散的四面体和八面体形式存在于分子筛的骨架中，随着钨含量的增加，当硅钨比为30时，分子筛中出现了微量的骨架外钨物种，当硅钨摩尔比为20时，骨架外钨含量增多。W-SBA-15分子筛在乙烯与2-丁烯歧化制丙烯反应中表现出优异的催化性能，在反应温度300℃、压力3.0 MPa、质量空速6.4 h-1的实验条件下，反应24 h后丁烯的转化率和丙烯的选择性分别高于50%和96％，优于传统的负载型WO3/SiO2催化剂。硅钨摩尔比为44时的W-SBA-15具有最好的钨物种分散性和最佳的烯烃歧化性能。

Abstract

Tungsten substituted mesoporous molecular sieves W-SBA-15 catalysts with different Si/W ratios were directly synthesized under hydrothermal conditions by using Na2WO4 as tungsten precursor and tetraethyl orthosilicate(TEOS) as silica precursor.The prepared W-SBA-15 catalysts were characterized by means of XRD

HRTEM

UV-Vis DRS

NH3-TPD and H2-TPR.The characterization data indicated that amorphous tetrahedral and octahedral tungsten species were mainly incorporated into the framework of SBA-15 (Si/W mole ratio of 44)

and further increase of the amounts of tungsten species led to the appearance of WO3 in the channels of W-SBA-15 (Si/W mole ratio of 30 and 20).The metathesis catalytic performance of W-SBA-15 catalysts was better than that of the conventional WO3/SiO2 catalysts prepared by impregnation.Under the conditions of 300℃

3.0 MPa and 6.4 h-1

butene conversion was more than 50% with the propylene selectivity exceeding 96% during the 24 h continuous operation

using W-SBA-15 as the catalyst.The W-SBA-15 with the Si/W mole ratio of 44 exhibited the best dispersion of tungsten species inside the SBA-15 and the best catalytic performance of olefin metathesis among the W-SBA-15 catalysts.

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