摘要
以TiO2为载体,采用浸渍法制备V-M/TiO2(M=Cu、Cr、Ce、Mn、Mo)双金属氧化物催化剂,考察其催化燃烧氯苯、二氯甲烷等含氯有机废气(CVOCs)的性能,并通过XRD、BET、H2-TPR和NH3-TPD对催化剂进行了表征.结果表明,V-Mo/TiO2催化剂比表面积最大,催化剂表面活性组分的高分散性和良好的酸性分布使得V-Mo/TiO2能够在260oC将氯苯完全转化为CO2和HCl.而V-Mn/TiO2则具有丰富的活性氧,可显著提高催化剂深度氧化二氯甲烷的能力,在380℃时二氯甲烷即可完全燃烧,并且反应对CO2有着很高的选择性.
A series of V-M/TiO2 （M=Cu、Cr、Ce、Mn、Mo）catalysts were prepared by impregnation method. The catalytic activity of chlorinated volatile organic compounds（CVOCs）, such as chlorobenzene（CB）、dichloromethane（DCM） over V-M/TiO2were investigated. The physical-chemical properties of the catalysts were also investigated by XRD、BET、H2-TPR and NH3-TPD. It was found that the V-Mo/TiO2 catalyst could completely combustion oxidation of chlorobenzene into CO2 and HCl at 260℃, which was related to the biggest BET surface and highly dispersed of surface acidity; Moreover, the V-Mn/TiO2 catalyst showed a high activity and good selectivity for catalytic combustion of dichloromethane （DCM）, with a 100%conversion obtained at 380℃. This performance was attributed to a large amount of active surface oxygen, which could enhance the ability of deep oxidation of dichloromethane.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2014年第9期2179-2185,共7页
China Environmental Science
基金
国家自然科学基金(21107096)
浙江省重大科技专项(2013C03021)
