Pt-Sn/Al2O3蜂窝催化剂催化氧化C6烃  

Catalytic oxidation of C6 hydrocarbons on Pt-Sn/Al2O3 honeycomb catalysts

作　　者：刘昳帆 龙高远 韩高瑞 沈奕昕 赵伟荣[1] LIU Yi-Fan;LONG Gao-Yuan;HAN Gao-Rui;SHEN Yi-xin;ZHAO Wei-Rong(College of Environmental&Resource Sciences,Zhejiang University,Hangzhou 310058,China;Jiangsu Angel Exhaust Gas Purification Co.,Ltd.,Yixing 214200,China;Zhejiang Hengrong Environmental Protection Technology Co.,Ltd.,Lishui 323000,China)

机构地区：[1]浙江大学环境与资源学院,浙江杭州310058 [2]江苏安琪尔废气净化有限公司,江苏宜兴214200 [3]浙江恒荣环保科技有限公司,浙江丽水323000

出　　处：《中国环境科学》2020年第4期1437-1443,共7页China Environmental Science

基　　金：国家自然科学基金资助项目(51778564)。

摘　　要：采用等体积分浸法制备Pt-Sn/Al2O3蜂窝催化剂(Pt含量仅为0.06wt%).运用X射线衍射(XRD)、透射电镜(TEM)等技术对催化剂理化性质进行表征,并选取4种代表性C6烃(苯、环己酮、环己烷和正己烷)对催化剂性能进行评价.活性评价试验中,Pt/Sn比为3/1催化效果最佳.此时4种C6烃转化率达到90%的温度(T(90))较Pt催化剂均降低约20℃,其原因在于Sn可将Pt分割为较小的团簇提高Pt分散度.寿命评价试验以环己烷为例同Pt-Sn蜂窝催化剂连续运行720h,催化活性无明显变化,其原因在于,Sn可有效抑制其粒径增长;Pt3Sn合金降低表面对C6烃的吸附,减少催化剂表面积炭.The Pt-Sn/Al2O3 honeycomb catalysts were prepared by incipient wetness sequence impregnation procedure(the content of Pt is only 0.06wt%),which were characterized by XRD,TEM and so on.The performances of catalysts were evaluated by selecting four representative C6 hydrocarbons(benzene,cyclohexanone,cyclohexane and n-hexane).The optimal Pt/Sn ratio was 3/1(w/w)in evaluating the catalytic activities,where the T90 of four C6 hydrocarbons decreased by about 20℃ compared with the Pt catalyst.Sn improved dispersion of Pt by dividing Pt into smaller clusters.The conversion of cyclohexane over Pt/Sn=3/1catalyst displayed no significant change after 720h of continuous run,in that Sn inhibited size growth effectively and Pt3Sn alloy structure weakened the adsorption of C6 hydrocarbons to reduce surface coke deposition.

关 键 词：PT C6烃 VOCS 密度泛函理论 Pt3Sn合金 

分 类 号：X511[环境科学与工程—环境工程]