Au/AC催化剂的制备及其催化性能  

Preparation and catalytic activity of Au/AC catalyst

作　　者：张博[1] 张彭义[1] 徐九华[2] 李宏煦[3] 史蕊[3] 

机构地区：[1]清华大学环境科学与工程系,北京100084 [2]北京科技大学土木与环境工程学院,北京100083 [3]北京科技大学冶金与生态工程学院,北京100083

出　　处：《中国有色金属学报》2009年第8期1505-1510,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50772058);国家重点实验室专项基金资助项目(08Y02ESPCT)

摘　　要：采用浸渍法制备改性活性炭负载金催化剂(Au/AC),并通过N2吸附-脱附、光电子能谱(XPS)对该催化剂进行表征,考察Au/AC催化剂在室温下对低浓度臭氧、甲苯以及二者共存时的催化分解性能。结果表明:Au/AC催化剂对臭氧具有优良的催化分解活性,在室温、空速76 000 h-1、相对湿度(45±5)%条件下,Au/AC对初始浓度为(55±5)mg/m3的臭氧在2 300 min时的去除率为91.3%;Au/AC对甲苯的去除未表现出明显的催化分解性能,而是以吸附作用为主;在臭氧和甲苯共存的条件下,Au/AC对臭氧的催化分解活性显著降低;与臭氧反应后,Au/AC的表面石墨碳含量显著降低,说明臭氧能够通过Au/AC催化其与活性炭的反应得以降解,且在反应前后,活性组分Au能够保持稳定的单质价态。The catalysts of Au supported on modified activated carbon were prepared by impregnation method and characterized by N2 adsorption-desorption and XPS. The catalytic activity of Au/AC for decomposition of ozone and toluene was evaluated. The results show that, under the condition of （55±5） mg/m^3 ozone in air, space velocity 76 000 h^-1, relative humidity （45±5）% and ambient temperature, the ozone removal ratio of the catalyst can be maintained at 91.3% within 2 300 min. And the activity of Au/AC catalyst is reduced when the toluene exists in the air. The graphitic carbon content of Au/AC decreases dramatically, which indicates that Au/AC can promote the reaction betweens the ozone and carbon. For the reason of competitive adsorption when ozone and toluene coexist, the activity of Au/AC declines obviously. However, Au maintains its stable state of metallic gold before and after the reaction.

关 键 词：金催化剂 催化 臭氧 浸渍法 

分 类 号：O643[理学—物理化学]