CoCr_2O_4/SiO_2催化剂上二氯甲烷催化氧化  

Catalytic combustion of dichloromethane over CoCr_2O_4/SiO_2 catalysts

作　　者：张婷婷 陈家喜 李艳明 鲁继青[1] 

机构地区：[1]浙江师范大学物理化学研究所,浙江金华321004 [2]浙江师范大学图文信息中心,浙江金华321004

出　　处：《工业催化》2017年第12期32-37,共6页Industrial Catalysis

基　　金：国家自然科学基金委项目(21173195)

摘　　要：采用浸渍法制备了不同CoCr_2O_4负载量x CoCr_2O_4/SiO_2催化剂(x=5%、10%、20%和30%),考察其对二氯甲烷催化燃烧性能的影响。结果表明,催化剂的整体活性顺序为:30CoCr_2O_4/SiO_2>20CoCr_2O_4/SiO_2>10CoCr_2O_4/SiO_2>5CoCr_2O_4/SiO_2,但按照活性组分CoCr_2O_4质量归一化后本征活性顺序为:10CoCr_2O_4/SiO_2≈5CoCr_2O_4/SiO_2>20CoCr_2O_4/SiO_2>30CoCr_2O_4/SiO_2。表征结果发现催化剂本征活性与可还原性能和表面酸性存在密切关系。10CoCr_2O_4/SiO_2和5CoCr_2O_4/SiO_2具有较高的表面酸性和耗氢量,因此具有较高的本征活性。Supported xCoCr_2O_4/SiO_2 catalysts with different contents of CoCr_2O_4( x = 5%,10%,20% and 30%) were prepared by impregnation method and tested for catalytic combustion of dichloromethane.The results showed that the overall activities of the catalysts followed the order of 30CoCr_2O_4/SiO_2>20CoCr_2O_4/SiO_2> 10CoCr_2O_4/SiO_2> 5CoCr_2O_4/SiO_2,but the intrinsic activities based on the CoCr_2O_4 mass normalized content followed the order of 10CoCr_2O_4/SiO_2≈5CoCr_2O_4/SiO_2> 20CoCr_2O_4/SiO_2>30CoCr_2O_4/SiO_2.Characterization results revealed that the intrinsic activity of the catalysts was closely related to its reducibility and surface acidity.Compared with the other two catalysts,the 10CoCr_2O_4/SiO_2 and 5CoCr_2O_4/SiO_2 had higher surface acidity and higher surface Cr ion density,therefore have higher intrinsic activity.

关 键 词：催化化学 CoCr2O4 二氯甲烷 催化氧化 表面酸性 可还原性 

分 类 号：O643.32[理学—物理化学] TQ222.214[理学—化学]