CO2气氛下MCF负载氧化钒催化剂上乙苯脱氢反应(英文)  

Ethylbenzene Dehydrogenation in the Presence of CO_2 over MCF-Supported Vanadium Oxide Catalysts

作　　者：李春光[1] 缪长喜[2] 聂颖颖[1] 乐英红[1] 顾松园[2] 杨为民[2] 华伟明[1] 高滋[1] 

机构地区：[1]复旦大学化学系,上海市分子催化和功能材料重点实验室,上海200433 [2]中国石油化工股份有限公司上海石油化工研究院,上海201208

出　　处：《催化学报》2010年第8期993-998,共6页

基　　金：Supported by the National Basic Research Program of China (973 Program,2006CB806103);the National Natural Science Foundation of China (20773027,20633030);the Shanghai Research Institute of Petrochemical Technology,and the Science and Technology Commission of Shanghai Municipality (08DZ2270500)

摘　　要：以介孔氧化硅泡沫MCF为载体合成了一系列负载型氧化钒催化剂(V含量为2%～10%).采用N2吸附、X射线衍射和H2程序升温还原对V/MCF催化剂的结构和织构性质进行了表征,并评价了催化剂在CO2气氛下的乙苯脱氢性能.V/MCF催化剂具有较高的乙苯脱氢活性,其中V含量为6%的催化剂具有最高的反应活性.V/MCF催化剂的乙苯脱氢活性显著高于V/MCM-41,这是由于前者具有较高的可还原性以及较好的扩散性能.CO2气氛下的乙苯转化率明显高于N2气氛下的,这归因于CO2与乙苯发生氧化脱氢,并通过逆水煤气变换反应在线除去脱氢反应生成的氢.A series of vanadia catalysts supported on mesocellular silica foam （MCF） with a V content ranging from 2% to 10% were studied with respect to their performance in the dehydrogenation of ethylbenzene （EB） to styrene in the presence of CO2.The structural and textural characterization of these catalysts was done using N2 adsorption,X-ray diffraction,and temperature-programmed reduction.These catalysts were found to be effective for the dehydrogenation reaction and the 6%V/MCF catalyst showed the highest activity.The MCF-supported vanadia catalysts exhibited far higher activity than their conventional V/MCM-41 counterparts,which can be attributed to the higher reducibility and better diffusion of reactants and products in the former catalysts.A higher conversion was obtained during EB dehydrogenation with CO2 than with N2.This is due to the oxidative dehydrogenation of EB with the help of oxygen that originates from CO2 as well as the coupling of EB simple dehydrogenation with the reverse water-gas shift reaction.

关 键 词：氧化钒 介孔氧化硅泡沫 负载型催化剂 乙苯脱氢 苯乙烯 二氧化碳 

分 类 号：TQ203.2[化学工程—有机化工]