中文摘要：

采用共沉淀法在不同焙烧温度下制备一系列尖晶石型CoCr_2O_4催化剂并测试其对CH_2Cl_2催化燃烧性能.制备的催化剂都具有高的反应活性,并发现其性能受到表面酸性和氧化还原性的协同作用.经600℃焙烧的CoCr_2O_4-6催化剂因其具有较高的表面酸量（0.46 mmol·gcat^-1）和较高表面吸附氧浓度（O_（ads）/O_（lat）=0.55）,因此活性最佳,其T_（50）为201℃,T_（90）为278℃.由XRD等结构表征可知该催化剂含CoCr_2O_4和Cr_2O_3两相,但CoCr_2O_4尖晶石是该催化剂的主要活性组分.

英文摘要：

A series of spinel type CoCr_2O_4 catalysts calcined at different temperatures were prepared by a co-precipitation method and tested for catalytic combustion of dichloromethane（ CH_2Cl_2）. These catalysts were active for this reaction. Detailed quantitative analyses revealed that the catalytic behavior was synergistically governed by surface acidity and redox ability of the catalyst. The best performance was obtained on a catalyst calcined at 600 ℃（CoCr_2O_4-6）,with a T_（50） of 201 ℃ and a T_（90） of 278 ℃,which was mainly due to the higher surface acidity（0. 46 mmol·gcat^-1）and the higher concentration of surface absorbed oxygen（ O_（ads）/ O_（lat）= 0. 55）. These catalysts contained a mixture of CoCr_2O_4 and Cr_2O_3,but the spinel CoCr_2O_4 was responsible for the observed activity of the catalyst.