A series of cobalt-based catalysts with different supports have been prepared using impregnation method, and characterized by X-ray diffraction (XRD), laser Raman (LR), and infrared spectroscopy (IR). The catalytic activities for methane combustion were assessed in a micro-reactor. The ZrO2 and Al2O3 supports are themselves active in methane combustion, and ZrO2 supported cobalt catalyst was found to have the highest activity amongst the TiO2, Al2O3, MgO supported catalysts and bulk Co3O4. The Co content has a marked effect on the activity of the ZrO2 supported catalyst with 1.0 and 15 wt.% of Co having the lowest light-off temperature in methane combustion. In the MgO supported catalyst, Co oxide was highly dispersed over the MgOsupport surface or enters the lattice ofMgOto form a solid solution, whose activity for methane combustion is reasonable. The zirconia supported cobalt catalysts are very active and stable when calcination or reaction temperature is no more than 900◦C. Calcining the catalysts at temperatures above 900℃ for more than 1h decreases the catalyst activity. The deactivation of the catalyst probably results from the decrease of the surface area.

in a continuousflow microreactor. The Co content has a significant effect on the activity of the cobalt-magnesium oxide solid solution catalysts. The catalysts containing 5 and 10% Co have the lowest light-off temperature in methane combustion. In the preparation of cobalt-magnesium oxide solid solution catalysts, higher urea to metal ratio favors the formation of the catalysts with smaller crystal particles and leads to a better catalytic performance for methane combustion. Addition of lanthanum nitrate to the solution of Co and Mg nitrate depressed the formation of the cobaltmagnesium oxide solid solution and decreased the activity of the catalysts for methane combustion. The cobalt-magnesium oxide solid solution catalysts are very stable when the calcination or reaction temperature is no more than 900◦C. However, the catalytic activity decreases rapidly after high temperature (>1000℃) calcination, possibly due to sintering of the catalyst and thus decrease of the surface area.

制备了不同组分Na、W、Mn/SiO2催化剂，在ITD（Ion Trap Detector）装置上进行了催化剂表面CO恒温脉冲反应（CO-CTPR）。 研究结果表明，单组分Na、W、Mn/SiO2催化剂体相晶格氧向表面扩散的速度顺序为Mn/SiO2/Na/S iO2/W/SiO2；与CO反应的表面晶格氧数量的顺序为M n/SiO2/Na/SiO2≈W/SiO2。多组分Na、W、Mn/SiO2催化剂体相晶格氧向表面扩散的速度顺序为Na-W/SiO2/Na-Mn/SiO2/W-Mn/SiO2/Na-W-Mn/SiO2，且Na与W、Mn的结合对体相晶格氧向表面的扩散有促进作用；与CO反应的表面晶格氧数量的顺序为Na-W-Mn/SiO2/Na-Mn/SiO2/W-Mn/SiO2/Na-W/S iO2。

制备了多组分Na、W、Mn/SiO2催化剂，在ITD（Ion Trap Detector）装置上进行了催化剂表面晶格氧脱附前后的甲烷恒温脉冲反应（CH4-CTPR）。研究结果表明，Na-W/SiO2催化剂表面晶格氧，具有较高的CH4转化率和C2烃选择性，并对C2H6 的生成起着重要的作用；Na-M n/SiO2催化剂表面晶格氧，也具有较高的CH4转化率和C2烃选择性，但对C2H6 的形成有一定的诱导期；W-M n/SiO2催化剂表面晶格氧，对CH4的转化和CO2的生成具有很高初活性，但对C2烃的选择性较低；Na-W-M n/SiO2催化剂表面晶格氧，具有很高的CH4转化率和C2烃定向选择性，这是由于Na、W、M n各组分协同作用的结果

制备了单组分Na/、W/、Mn/SiO2催化剂，在ITD（Ion Trap Detector）装置上进行了催化剂表面晶格氧脱附前后的甲烷恒温脉冲反应（CH4-CTPR）。研究结果表明，Na/SiO2表面晶格氧具有一定的C2烃选择性，并能强烈抑制CO2的生成；w/SiO2表面晶格氧对C2烃的选择性较差，但对Cox具有高的选择性；Mn/SiO2表面的晶格氧对C2H4和CO具有高选择性，而较深部位的晶格氧则对C2H6和CO2具有高的选择性。