Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第19卷    第8期    总第125期    2009年8月

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文章编号:1004-0609(2009)08-1505-06
Au/AC催化剂的制备及其催化性能
张  博1,张彭义1,徐九华2,李宏煦3,史  蕊3

(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。

 

关键词: 金催化剂;催化;臭氧;浸渍法

Preparation and catalytic activity of Au/AC catalyst
ZHANG Bo1, ZHANG Peng-yi1, XU Jiu-hua2, LI Hong-xu3, SHI Rui3

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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