Mo/HZSM-5上甲烷脱氢聚合制苯反应  

Dehydro-oligomerization of methane over Mo/HZSM-5 catalyst

作　　者：谭平连[1] 徐竹生[2] 张涛[2] 

机构地区：[1]中南工业大学化学化工学院,湖南长沙410083 [2]中科院大连化物所,辽宁大连116023

出　　处：《中南工业大学学报》2000年第2期131-133,共3页Journal of Central South University of Technology(Natural Science)

基　　金：国家自然科学基金资助项目! ( 2 95 73 13 7)

摘　　要：考察了氧气气氛下 ,活化前后分别用H2 处理 0 5h对Mo/HZSM 5催化剂反应活性的影响 .结果表明 :活化后用H2 处理后催化活性显著降低 .甲烷添加O2 ,CO2 后 ,于 70 0℃时进行氧化反应 ,无苯生成 ;75 0℃时甲烷与O2 反应在进行氧化反应的同时 ,有偶联反应发生 .反应温度的提高使甲烷转化率与苯的选择性均有提高 ,但催化剂稳定性下降 ,可能归结为积炭增加和钼组分的挥发流失 .The results show that activity of the catalyst reduces remarkably after pretreatment in flowing hydrogen. The methane conversion decreased from 7.06% to 4.43%. The methane conversion and the benzene selectivity increase with the increase of reaction temperature from 923 to 1 023 K, while the stability of Mo/HZSM 5 catalyst decreases because of the faster carbon deposition velocity as well as easier volatility of species of molybdenum. The reaction of methane with oxygen produced CO, CO 2 and H 2O at 973 K. When the reaction temperature reached 1 023 K, ethylene and ethane appeared, together with CO, CO 2 and H 2O. It shows that methane oxidative coupling reaction occured. The reaction of methane with carbon dioxide produced CO and H 2O, no benzene or other aromatics produced. [

关 键 词：甲烷 MO/HZSM-5催化剂 苯 脱氢聚合 氧气 实验 

分 类 号：O625.11[理学—有机化学] O643.322[理学—化学]