应用Pd/CeO_2-ZrO_2-MnO_x储氧材料降低卷烟烟气中CO的研究

Research on the removal of carbon monoxide in cigarette smoke by oxygen-storage material Pd/CeO_2-ZrO_2-MnO_x

采用浸渍法制备Pd/CeO_2-ZrO_2-MnOx储氧材料催化剂,并运用扫描电镜和热重-差热技术对催化剂进行表征。考察了Pd/CeO_2-ZrO_2-MnO_x催化剂中MnO_x含量、催化剂用量以及催化剂添加位置对卷烟主流烟气中CO去除率的影响,并且初步探究了Pd/CeO_2-ZrO_2-MnO_x催化剂降低CO的催化机理。结果表明:(1)随着MnOx含量的增加,催化剂降低CO的能力逐步增加,最佳量为15%(wt,质量分数,下同);(2)催化剂用量对降低CO没有明显的影响,最终确定催化剂用量为30mg;(3)将1%Pd/CeO_2-ZrO_2(摩尔比1∶1)-MnOx(15%)的催化剂添加到烟支前端,CO的去除率最好,可以达到29.62%。

Pd/CeO2-ZrO2-MnOx oxygewstorage material catalysts were prepared by impregnation method. The cata lysts were characterized by SEM and TG-DSC. The effects of MnOx content in catalysts, the quantity and the added location of Pd/CeO2-ZrO2-MnOx catalysts on the removal efficiency of carbon monoxide in cigarette mainstream smoke were investi- gated. And the catalytic mechanism for carbon monoxide degradation by catalyst was researched. The results showed that： （1） the ability to reduce carbon oxide increased with increasing MnO, content, the optimum amount was 15 wt % ; （2） There was no significant effect on reducing carbon monoxide with the catalyst amount, the optimum amount was 30mg; （3） when l wt% Pd/CeO2-ZrO2 （molar ratio 1：1） MnOx （15wt%） were added to cigarette end, the removal efficiency of carbon mon- oxide was the best,and it was 29.62%.