化学学报 ›› 2004, Vol. 62 ›› Issue (18): 1738-1744. 上一篇    下一篇

研究论文

SBA-15负载钒氧化物催化剂上甲烷选择氧化反应

汪晓星, 林宝敏, 杨薇, 郭倩, 张庆红, 王野   

  1. 厦门大学化学系固体表面物理化学国家重点实验室, 厦门, 361005
  • 投稿日期:2004-04-01 修回日期:2004-08-09 发布日期:2014-02-17
  • 通讯作者: 王野,E-mail:yewang@jingxian.xmu.edu.cn;Fax:0592-2183047. E-mail:yewang@jingxian.xmu.edu.cn
  • 基金资助:
    国家自然科学基金(Nos.20021002,20273054)、国家重点基础研究发展规划项目(No.G1999022408)和教育部留学回国启动基金资助项目.

SBA-15 Supported Vanadium Oxide Catalyst for Selective Oxidation of Methane

WANG Xiao-Xing, LIN Bao-Min, YANG Wei, GUO Qian, ZHANG Qing-Hong, WANG Ye   

  1. State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005
  • Received:2004-04-01 Revised:2004-08-09 Published:2014-02-17

对SBA-15负载的钒、钼、钨氧化物催化的甲烷选择氧化反应性能进行了比较,发现VOx/SBA-15催化剂优于MoOx/SBA-15和WOx/SBA-15催化剂.针对钒氧化物催化剂,考察了不同钒源、不同载体以及少量P元素的添加对催化性能的影响,结果表明以SBA-15为载体的催化剂的性能好于MCM-41和Cab-O-Sil为载体的催化剂;与V2O5,VO(C2O4)相比,NH4VO3是制备性能良好的VOx/SBA-15的钒源;在VOx/SBA-15中,添加少量P元素后,HCHO的选择性有一定程度的提高.XRD,N2物理吸附、UN-Raman和H2-TPR表征结果表明,负载量低于3 wt%时,钒组分可能主要以高分散的单核的VOx物种存在,我们推测该物种对甲烷选择氧化制甲醛起关键作用.

关键词: SBA-15, 钒氧化物, 甲烷选择氧化, 甲醛

The VOx/SBA-15 has been found to be a better catalyst for the selective oxidation of methane to formaldehyde than SBA-15-supported Mo and W oxides. The influences of catalyst support and vanadium source on catalytic performances have been studied. The results show that SBA-15 is a better support than MCM-41 and Cab-O-Sil, and the catalyst with NH4VO3 as the precursor exhibits higher performances. The addition of phosphorus has been found to enhance slightly the selectivity to HCHO. Characterizations by XRD, N2 physical adsorption, Raman spectroscopy and H2-TPR suggest that the supported VOx species with loading amounts lower than 3 wt% be highly dispersed (probably as monomer) and contribute to the selective oxidation of methane to formaldehyde.

Key words: SBA-15, vanadium oxide, selective oxidation of methane, formaldehyde