含锌尖晶石型ZnM_2O_4(M=Cr,Al,Fe)催化剂上二氯甲烷高效催化燃烧

采用溶胶凝胶法制备出一系列的含锌尖晶石型ZnM_2O_4(M=Cr,Al,Fe)催化剂并测试其对二氯甲烷催化燃烧性能,并对催化剂进行了XRD,H_2-TPR,NH_3-TPD和XPS等表征.制备出的催化剂都具有较高的反应活性,其中ZnCr_2O_4尖晶石活性最佳,其T50为277℃.表征结果表明,催化剂的性能受到表面酸性和氧化还原性的协同作用.ZnCr_2O_4尖晶石催化剂具有较小的中等酸强度的表面酸性和最佳的低温还原性能,因此反应性能最佳.

Zinc Spinel Type ZnM2O4 (M = Cr, Al, Fe) Catalysts for Dichloromethane Combustion

Abstract: A series of zinc spinel type ZnM2O4 (M = Cr, Al, Fe) catalysts were prepared by a sol-gel method, which were characterized by XRD, H2-TPR, NH3 -TPD and XPS.techniques and tested for catalytic combustion performance of dichloromethylene. It was found that the prepared catalysts were active for the reaction, with the ZnCr2O4 oxide possessing the highest activity. The characterization results showed that the catalytic performance of the catalyst was governed synergistically by surface acidity and reducibility. The ZnCr2O4 spinel catalyst had low surface acidity of moderate acid strengthand the best low temperature reducibility, and therefore the best performance.