Dehydrogenation of methylcyclohexane over Pt supported on Mg–Al mixed oxides catalyst:The effect of promoter Ir  

作　　者：Lei Miao Jing Yan Weiyan Wang Yanping Huang Wensong Li Yunquan Yang 

机构地区：[1]School of Chemical Engineering,Xiangtan University,Xiangtan 411105,China

出　　处：《Chinese Journal of Chemical Engineering》2020年第9期2337-2342,共6页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21676225 and 21776236);Natural Science Foundation of Hunan Province(2018JJ2384);Fund of Hunan Provincial Education Department(19A478);Collaborative Innovation Centre of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization;Engineering Research Centre of Chemical Process Simulation and Optimization of Ministry of Education。

摘　　要：To enhance the hydrogen release during hydrogen storage,several Pt-Ir supported on Mg-Al mixed oxide catalysts were prepared and then applied into the dehydrogenation of methylcyclohexane(MCH)in this study.The effects of iridium content,reduction temperature on the activity and stability of the catalysts were studied in detail.In the presence of Ir,metal particle size was decrea sed and electron transfer between Ir and Pt was observed.High reduction temperature increased the metallic Ir content but enlarged the particle size of active site s.During the dehydrogenation reaction on Pt-Ir bimetallic catalyst,MCH was efficiently converted into toluene and PtIr-5/Mg-Al-275 exhibited the highe st activity.After prolonging the residence time and raising the reaction temperature to 350℃the conversion and hydrogen evolution rate were increased to 99.9%and 578.7 mmol·(g Pt)^-1·min^-1,respectively.Moreover,no carbon deposition was observed in the spent catalyst,presenting a high anti-coking ability and good potential for industrial application.

关 键 词：DEHYDROGENATION METHYLCYCLOHEXANE Mg-Al mixed metal oxides Pt-Ir Stability 

分 类 号：O643.36[理学—物理化学]