由杂多钼酸盐前驱体制备的氧化钼催化剂催化CO_2存在下的异丁烷脱氢(英文)  

Conversion of Isobutane in Presence of Carbon Dioxide over Molybdenum Oxide Catalysts Obtained from Heteropolymolybdate Precursors

作　　者：Ahmed AOUISSI Daif ALDHAYAN Saad ALKAHTANI 

机构地区：[1]Chemistry Department,College of Science,King Saud University

出　　处：《催化学报》2012年第9期1474-1479,共6页

基　　金：the Deanship of Scientific Research at King Saud University for funding the work through the research group project No RGP-VPP-025

摘　　要：Molybdenum based oxide catalysts Mo-H,Mo-Fe,Mo-Ce,and Mo-Sn were prepared by calcining H3PMo12O40,Fe1.5 PMo 12O40,Ce1.5PMo12O40,and Sn1.5 PMo12O40 heteropolyanion precursors at700℃,respectively.The prepared oxides have been characterized and tested for the dehydrogenation of isobutane(IB)to isobutene in the presence of CO2.The effects of temperature,time on stream,and CO2 /IB ratio were investigated.It was found that α-and-MoO3 phases were present in all catalysts.Catalytic tests showed that increasing the reaction temperature increased both the conversion and isobutene selectivity,whereas increasing the CO2 /IB molar ratio increased the conversion but decreased the selectivity for isobutene.Iron was found to be an effective additive element for the enhancement of catalytic activity compared with Ce and Sn.Molybdenum based oxide catalysts Mo-H,Mo-Fe,Mo-Ce,and Mo-Sn were prepared by calcining H3PMo12O40,Fe1.5 PMo 12O40,Ce1.5PMo12O40,and Sn1.5 PMo12O40 heteropolyanion precursors at700℃,respectively.The prepared oxides have been characterized and tested for the dehydrogenation of isobutane（IB）to isobutene in the presence of CO2.The effects of temperature,time on stream,and CO2 /IB ratio were investigated.It was found that α-and-MoO3 phases were present in all catalysts.Catalytic tests showed that increasing the reaction temperature increased both the conversion and isobutene selectivity,whereas increasing the CO2 /IB molar ratio increased the conversion but decreased the selectivity for isobutene.Iron was found to be an effective additive element for the enhancement of catalytic activity compared with Ce and Sn.

关 键 词：ISOBUTANE ISOBUTENE HETEROPOLY compound mixed oxide carbon dioxide 

分 类 号：O643.32[理学—物理化学]