SBA-15负载钒氧化物催化剂上甲烷选择氧化反应  

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

作　　者：汪晓星[1] 林宝敏[1] 杨薇[1] 郭倩[1] 张庆红[1] 王野[1] 

机构地区：[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

出　　处：《化学学报》2004年第18期1738-1744,共7页Acta Chimica Sinica

基　　金：国家自然科学基金 (Nos.2 0 0 2 1 0 0 2 ;2 0 2 730 54);国家重点基础研究发展规划项目 (No .G1 9990 2 2 4 0 8);教育部留学回国启动基金资助项目

摘　　要：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V2 O5,VO(C2 O4)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、UV Raman和H2 TPR表征结果表明 ,负载量低于 3wt%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 .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, N-2 physical adsorption, Raman spectroscopy and H-2-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.

关 键 词：甲烷 选择氧化反应 SBA-15负载钒氧化物催化剂 甲醛 

分 类 号：O643.3[理学—物理化学]