嫁接法制备Ni/SBA-15催化剂的催化氯苯加氢脱氯

摘要

Mesoporous silica supported Ni catalysts were prepared using the grafting method via adsorption of Ni2+ on aminopropyl functionalized SBA-15 (denoted as Ni/SBA-15N). For comparison, supported Ni catalysts on unmodified SBA-15 were also prepared using the conventional impregnation method (denoted as Ni/SBA-15). At similar Ni loading, the Ni dispersion of Ni/SBA-15N was higher than that of Ni/SBA-15. XRD and TPR results show that nickel silicate is formed on the surface of aminopropyl functionalized SBA-15, while NiO is observed on the surface of SBA-15. For the gas phase catalytic hydrodechlorination of chlorobenzene, the Ni loading has minor effect on the catalytic activity of Ni/SBA-15, whereas increasing the Ni loading will result in the enhanced catalytic activity of Ni/SBA-15N.%SBA-15表面经嫁接方式引入氨基官能团,与Ni络合制备了SBA-15负载的Ni催化剂(Ni/SBA-15N).同时,采用传统的浸渍法制备了具有相似Ni负载量的催化剂(Ni/SBA-15).在负载量相近条件下,Ni/SBA-15N的Ni颗粒分散性均高于Ni/SBA-15.XRD和TPR结果表明,催化剂焙烧后,在氨化SBA-15表面,Ni以硅酸镍形式存在,而在SBA-15表面,Ni以NiO形式存在.Ni/SBA-15对氯苯催化加氢脱氯活性不随Ni负载量的变化而变化；而在Ni/SBA-15N中,Ni负载量增加,催化剂活性增加.