化学学报 ›› 2004, Vol. 62 ›› Issue (23): 2297-2302. 上一篇    下一篇

研究论文

高硫化氢合成气制甲硫醇新型钼基催化剂研究

王琪, 陈爱平, 谢春芳, 郑泉兴, 方维平, 袁友珠, 张鸿斌, 杨意泉   

  1. 厦门大学化学系, 物理化学研究所, 固体表面物理化学国家重点实验室, 厦门, 361005
  • 投稿日期:2004-04-05 修回日期:2004-06-03 发布日期:2014-02-17
  • 通讯作者: 杨意泉,E-mail:yyiquan@xmu.edu.cn;Fax:0592-2183047. E-mail:yyiquan@xmu.edu.cn
  • 基金资助:
    国家自然科学基金(No.20173043)资助项目.

Novel Mo-based Catalysts for Methanethiol Synthesis from High H2S-containing Syngas

WANG Qi, CHEN Ai-Ping, XIE Chun-Fang, ZHENG Quan-Xing, FANG Wei-Ping, YUAN You-Zhu, ZHANG Hong-Bin, YANG Yi-Quan   

  1. Department of Chemistry, Institute of Physical Chemistry, Key Laboratory for Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005
  • Received:2004-04-05 Revised:2004-06-03 Published:2014-02-17

研究了一系列负载型钼基催化剂催化含高硫化氢合成气制甲硫醇的性能,用XPS和ESR对其进行表征.活性测试显示,钾促进的钼基催化剂催化的反应产物中甲硫醇成为主导产物.几种钼基催化剂合成甲硫醇的活性大小顺序:K2MoO4/CoO/SiO2>K2MoO4/SiO2>MoO3/K2CO3/SiO2>K2MoS4/SiO2>MoS2/K2CO3/SiO2.ESR表征显示,反应后的催化剂可以检测到"oxo-Mo(V) "和"thio-Mo(V)"物种.XPS表征显示反应后催化剂中的Mo包含着Mo4+,Mo5+和Mo6+,S包含着S2-,(S-S)2-和S6+三种价态.添加CoO后,"oxo-Mo(V)"含量减少,而"thio-Mo(V)"含量增加,(S-S)2-物种的生成得到抑制,S2-物种的量增多.(Mo4++Mo5+)/Mo6+峰强度比为0.75以及S2-/(S-S)2-接近1有利于甲硫醇的生成.本文提出甲硫醇的合成与"Mo-S-K"相关联的反应机理.

关键词: 甲硫醇, 高硫化氢合成气, 钼基催化剂

A series of supported Mo-based catalysts for methanethiol synthesis from high H2S-containing syngas were investigated by kinetics and XPS, ESR characterization.The activity evaluating results show that upon the potassium-promoted Mo-based catalysts, the methanethiol will become dominant product of the reaction, and the activity sequence of several Mo-based catalysts for the reaction is as follows: K2MoO4/CoO/SiO2K2MoO4/SiO2MoO3/K2CO3/SiO2K2MoS4/SiO2MoS2/K3CO3/SiO2.In the ESR characterization of the catalysts used the resonant signals of "oxo-Mo(V)" and "thio-Mo(V)" can be detected.The XPS characterization indicates that mixed valence Mo species Mo4+, Mo5+ and Mo6+ and three kinds of S species S2-, (S—S)2- and S6+ exist in the catalysts.As a promoter CoO was introduced into Mo-based catalysts.It was observed that the addition of CoO leads to decrease of the amount of "oxo-Mo(V)" in the catalysts, but increase of the amount of "thio-Mo(V)", which may be connected with "Mo-S-K" phase or "Co-Mo-S-K" phase, meanwhile CoO in the catalyst was found to enhance the formation of S2-, but inhibit the formation of (S—S)2-.It was found also that the methanethiol synthesis is favored if the peak intensity ratios of (Mo4++Mo5+)/Mo6+ and S2-/(S—S)2- are kept at about 0.75 and 1 level respectively.A possible mechanism about the relationship of CH3SH formation with "Mo-S-K" phase was proposed.

Key words: methanethiol, H2S-containing syngas, Mo-based catalyst