Direct synthesis of hydrogen peroxide over Pd nanoparticles embedded between HZSM-5 nanosheets layers

查看全文 作　　者：Guozhu [1]Liu;Hairui [1]Liang;Yajie [2]Tian;Bofeng [1]Zhang;Li [1]Wang

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;[2]College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475001,China

出　　处：《Chinese Journal of Chemical Engineering》索引2020年第28卷第10期,共10页

基　　金：Financial supports by the National Natural Science Foundation of China(21776210);Science and Technology Research Project of Henan Province(No.202102210048)。 摘　　要：Direct synthesis of hydrogen peroxide(DSHP)was studied over Pd loaded on HZSM-5 nanosheets(Pd/ZN).Pd nanoparticles with average size of ca.4.3 nm were introduced into the adjacent nanosheet layers(thickness of ca.2.9 nm)by impregnation method.Pd/ZN with theoretical Si/Al molar ratio of 25 showed the highest selectivity for H2O2 among the prepared catalysts,together with highest formation rate of H2O2(38.0 mmol·(g cat)^-1·h^-1),1.9 times than that of Pd supported on conventional HZSM-5 zeolite(Pd/CZ-50).Better catalytic performance of nanosheet catalysts was attributed to the promoted Pd dispersion which promoted H2 dissociation,more BrΦnsted acid sites and stronger metal-support interaction which inhibited the dissociation of O-O bond in H2O2.The embedded structure sufficiently protected the Pd nanoparticles by space confinement which restrained the Pd leaching,leading to a better catalytic stability with 90%activity retained after 3 cycles,which was almost 3 times than that of Pd/CZ-50(30.4%activity retained). 关键词：HZSM-5 nanosheets Palladium catalyst Silica/alumina molar ratio Metal-support interaction Direct synthesis of hydrogen peroxide

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Direct synthesis of hydrogen peroxide over Pd nanoparticles embedded between HZSM-5 nanosheets layers

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