【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。更多还原

【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.更多还原