(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)
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。
关键字: 金催化剂；催化；臭氧；浸渍法
（1. Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084,China;
2. School of Civil and Environmental Engineering, University of Science and Technology Beijing,
Beijing 100083, China;
3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing,
Beijing 100083,China）
Abstract: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/m3 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.
Key words: gold catalyst; catalysis; ozone; impregnation
