Dilute Methane Catalytic Combustion Over Cobalt-based Monolith Catalysts

A series of cobalt-based catalysts with different supports have been preparedusing impregnation method, and characterized by BET,XRD and H2-TPR。Thecatalytic activities for methane combustion were assessed in a micro-reactor。 The results show that OSM is kind of good support for methane catalyticcombustion catalysts。YSZ-Al2O3+OSM supported cobalt monolith catalysts wasfound to have the highest activity amongst Ce0.25Zr0.50Mn0.25O2 (oxygen storagematerials),YSZ-Al2O3 (Y2O3 and ZrO2 stabilized alumina),YSZ-Al2O3 +OSMsupported catalysts。 The methane combustion activity of the YSZ-Al2O3+OSMsupported cobalt catalyst is first increased, passes through a maximum and thendecreases with increasing the content of cobalt from 1wt% to 20wt%, the maximumactivity was observed for the catalyst with 10wt% of cobalt。The methanecombustion activity of the Co/YSZ-Al2O3+Co/OSM is first increased, passesthrough a maximum and then decreases with increasing the content of Co/OSM , themaximum activity was observed for the catalyst with 50wt% of Co/OSM。However, aged at high temperature, maximum activity of the Co/YSZ-Al2O3 after the+Co/OSM was observed for the catalyst with 75wt% of Co/OSM。The content ofMn in OSM was found to have a profound influence on activity of Co/OSMcatalyst。 XRD revealed cobalt were high disperse on YSZ-Al2O3,a further promotion ofdisperse is observed with the introduction of Co/OSM into Co/YSZ-Al2O3。H2-TPR 5四川大学硕士学位论文revealed that higher the content of OSM in support,higher the reductive of catalysts。The reductive of the Co/YSZ-Al2O3 +Co/OSM increase with increasing thecontent of Co/OSM。 The combustion conditon of dilute methane is more close to the factthan dense methane's。...