甲烷氧化偶联Na_2WO_4-Mn/SiO_2催化剂热效应的研究  

Thermal Effects during the Oxidative Coupling of Methane over Na_(2)WO_(4)-Mn/SiO_(2) Catalyst

作　　者：王嘉欣[1] 丑凌军[1] 张兵[1] 宋焕玲[1] 杨建[1] 赵军[1] 李树本[1] 

机构地区：[1]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室

出　　处：《分子催化》2006年第4期306-310,共5页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金面上项目(20373081)

摘　　要：采用固定床微型反应装置,研究了甲烷氧化偶联反应过程中Na2WO4-Mn/S iO2催化剂床层的热效应和催化性能的关系,考察了反应炉温、CH4/O2比和反应气体空速对催化剂床层热点分布的影响.研究结果表明,甲烷氧化偶联催化剂床层的热效应强烈依赖于反应条件.反应炉温越高,CH4/O2比越低,反应气体空速越大,催化剂床层的热点温度越高.结合催化性能和热效应关系的研究,为优化甲烷氧化偶联的反应操作提供了实验依据.The thermal effects of the oxidative coupling of methane have been investigated in a fixed-bed quartz reactor over Na2WO4- Mn/SiO2 catalyst. The exothermic reactions that occur during the oxidative coupling of methane result in relatively narrow hot spots on the catalyst bed. Under integral conditions, the temperature of the hot spots is related to the furnace temperature, CH4/O2 ratio, GHSV and catalyst activity. The peak temperature of hot spot increases with the increase of furnace temperature. With the decrease of CH4/O2 ratio, the peak temperature increases rapidly due to the high conversion of methane. Higher GHSV benefit the oxidation conversion of methane and the reactions in gas phase, thereby a considerable rise of peak temperature with the increase of GHSV has been observed.

关 键 词：甲烷氧化偶联 Na2WO4-Mn/SiO2催化剂 热效应 热点 

分 类 号：O643.32[理学—物理化学]