(1. 清華大學(xué) 環(huán)境科學(xué)與工程系，北京 100084；
2. 北京科技大學(xué) 土木與環(huán)境工程學(xué)院，北京 100083；
3. 北京科技大學(xué) 冶金與生態(tài)工程學(xué)院，北京 100083)
摘 要: 采用浸漬法制備改性活性炭負(fù)載金催化劑(Au/AC)，并通過N2吸附−脫附、光電子能譜(XPS)對該催化劑進(jìn)行表征，考察Au/AC催化劑在室溫下對低濃度臭氧、甲苯以及二者共存時(shí)的催化分解性能。結(jié)果表明：Au/AC催化劑對臭氧具有優(yōu)良的催化分解活性，在室溫、空速76 000 h−1、相對濕度(45±5)%條件下，Au/AC對初始濃度為(55±5) mg/m3 的臭氧在2 300 min時(shí)的去除率為91.3%；Au/AC對甲苯的去除未表現(xiàn)出明顯的催化分解性能，而是以吸附作用為主；在臭氧和甲苯共存的條件下，Au/AC對臭氧的催化分解活性顯著降低；與臭氧反應(yīng)后，Au/AC的表面石墨碳含量顯著降低，說明臭氧能夠通過Au/AC催化其與活性炭的反應(yīng)得以降解，且在反應(yīng)前后，活性組分Au能夠保持穩(wěn)定的單質(zhì)價(jià)態(tài)。
關(guān)鍵字: 金催化劑；催化；臭氧；浸漬法
（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
