CAJ | 학술논문

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.
이개공양화규포말MCF위재체합성료일계렬부재형양화범최화제(V함량위2%～10%).채용N2흡부、X사선연사화H2정서승온환원대V/MCF최화제적결구화직구성질진행료표정,병평개료최화제재CO2기분하적을분탈경성능.V/MCF최화제구유교고적을분탈경활성,기중V함량위6%적최화제구유최고적반응활성.V/MCF최화제적을분탈경활성현저고우V/MCM-41,저시유우전자구유교고적가환원성이급교호적확산성능.CO2기분하적을분전화솔명현고우N2기분하적,저귀인우CO2여을분발생양화탈경,병통과역수매기변환반응재선제거탈경반응생성적경.
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.