不同方法制备碳载金催化剂对臭氧的催化分解  

Catalytic Activity of Au Supported on Activated Carbon Catalyst Preparing with Different Methods for Ozone Decomposition

作　　者：张博[1] 徐九华[1] 李宏煦[2] 史蕊[2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《有色金属》2011年第1期105-108,共4页Nonferrous Metals

基　　金：国家自然科学基金资助项目(50772058)

摘　　要：采用浸渍法和溶胶负载法制备以改性活性碳为载体以纳米金为活性组分的催化剂,通过BET,SEM和XPS表征制备方法对催化剂比表面积、孔隙结构、表面形貌及表面元素组成的影响,测试催化剂在室温下对低浓度臭氧的催化分解性能。结果显示,在室温,相对湿度为45±5%,空速为96000h-1,臭氧初始浓度为50mg/m3,气体与催化剂的接触时间为0.04 s的条件下,在1200m in时采用浸渍法制备的催化剂对臭氧的分解率为85%,而溶胶负载法制备的催化剂此时对臭氧的分解效率仍在94%以上。采用溶胶负载法制备的催化剂纳米金颗粒粒径更小、更均匀,在催化剂表面的覆盖率更大是其催化活性更高的主要原因。The catalysts of nano-particle Au supported by modified activated carbon are prepared with the methods of impregnation and sol-immobilized,and characterized by BET,SEM and XPS to consider the influence of preparation method to its specific surface area,pore structure,surface topography and composition.The catalytic activity for low-level ozone decomposition at ambient temperature of the catalysts is evaluated.The results show that under the condition of 50mg/m3 ozone in air,space velocity 96000 h-1,relative humidity 45±5%,contact time 0.04s and ambient temperature,the ozone removal ratio with the catalyst prepared by impregnation method is at 85% within 1200min,however,the ozone removal ratio with the catalyst by sol-immobilized method could be maintained above 94%.This is due to the reason that the supported gold nanoparticles in the catalyst prepared with sol-immobilized method are much smaller and more uniformly dispersed on the activated carbon,exhibit the higher fraction of coverage.

关 键 词：环境工程 臭氧分解 载金催化剂 浸渍法 溶胶负载法 

分 类 号：X515[环境科学与工程—环境工程]