钴锰氧化物的表征分析及其催化氧化甲苯的性能对比研究

Characterization and Analysis of CoMn Metal Oxides and Comparative Study on Catalytic Oxidation of Toluene

为研究钴锰氧化物对甲苯的催化降解效果,通过XPS,H_(2)-TPR,O_(2)-TPD等对制备的单金属氧化物CO_(3)O_(4),Mn_(3)O_(4)及以水滑石为前驱体的多金属氧化物CoAl-MMO,CoMnAl-MMO等催化剂的微结构、组成和氧化还原性能进行了表征分析。研究结果表明:钴锰氧化物催化氧化甲苯的活性顺序依次为CoMnAl-MMO≈Mn_(3)O_(4)>CoAl-MMO>Co_(3)0_(4);Co_(3)和Mn^(3+)/Mn^(4+)有利于钴锰氧化物催化氧化甲苯;钴锰的协同作用加速了氧化还原过程中的电子转移。多金属掺杂有利于表面氧空穴的产生,加快氧物种在催化剂的内部及表面的流动传输,使其具备更强的氧化还原活性。

To study the catalytic degradation effect of cobalt manganese oxide on toluene,the morphology,structure and redox performance of single metal oxides(includes CO_(3)O_(4) and Mn_(3)O_(4)),and MMO(includes CoAl-MMO and CoMnAl-MMO derived from layered double hydroxides)were characterized by XPS,H_(2)-TPR,O_(2)-TPD,et al.The results show that the catalytic activity for toluene degradation follows the trend of CoMnAl-MMO≈Mn_(3)O_(4)>CoAl-MMO>CO_(3)O_(4);Co^(3+)and Mn^3(+)/Mn^(4+) favor the toluene degradation.The synergistic effect of cobalt and manganese accelerates the electron transfer in the redox process.In addition,polymetallic doping is beneficial to the formation of surface oxygen holes,accelerate the flow of oxygen species in the interior and surface of the catalyst,and make it have stronger redox activity.