整体式CuMn_(2)/Cord上挥发性有机物C_(6)H_(6)催化燃烧实验研究

The Experimental Research of Catalytic Combustion for Volatile Organic Benzene Over Monolithic CuMn_(2)/Cord Catalysts

本文在蜂窝状堇青石(Cord)载体上多次浸渍制备了CuMn2/Cord整体式催化剂,通过改变活性组分负载量和后处理方式来考察催化剂对C6H6的催化性能,并重点研究了C6H6在不同催化剂上反应活性和动力学特性,结果表明:经无水乙醇后处理的催化剂表面晶体分散均匀度相比水洗更好,相同条件下可为C6H6提供更多的反应活性位;浓度为750 mg·Nm^-3的C6H6气流以4000 h^-1的空速分别在六种催化剂和堇青石(Cord)载体中的催化反应特性表明:发现三次负载醇洗>二次负载醇洗=三次负载水洗>一次负载醇洗>二次负载水洗>一次负载水洗>堇青石(Cord);所制备的催化剂对C6H6催化燃烧的活化能为40~60 kJ·mol^-1,通过Sm准则数判定,反应温度区间被200℃、250℃分为动力控制、过渡区和扩散区。

In this paper,CuMn2/Cord monolithic catalysts were prepared on honeycomb cordierite carrier by multiple impregnation.On the one hand,the catalytic performances were studied via altering active ingredients of loading and post-processing method.On the other hand,the activity and kinetic characteristics for benzene on various catalysts were also studied.According to the experimental results,ethanol post-processing is better than washing in the preparation of catalyst,which forms more reactive active sites and enhances benzene conversion rate under the same conditions.In addition,the benzene with a concentration of 750 mg-Nm^-3 over six different kinds of catalyst and cordierite carrier were respectively carried out in the space velocity of 4000 h^-1,which shows that the conversion rates of benzene over six catalysts follows the following rules:three times the loading with alcohol washed> twice loading with alcohol washed=three times loading with water washed> once loading with alcohol washed> twice loading of water washed> cordierite carrier.Finally,the activation energy of the catalytic combustion for benzene is 40~60 kJ·mol^-1 through calculation.And judging by the Sm number,the catalytic reaction temperature range is divided into dynamic control,transition zone and diffusion zone by 200℃ and 250℃.