V_2O_5/γ-Al_2O_3和V_2O_5/SiO_2负载型催化剂对异丁烷的催化脱氢性能  

Catalytic Behavior of V_2O_5/γ-Al_2O_3 and V_2O_5/SiO_2 in Dehydrogenation of Isobutane to Isobutene

作　　者：马红超[1] 付颍寰[1] 王振旅[1] 朱万春[1] 吴通好[1] 王国甲[1] 

机构地区：[1]吉林大学化学学院,长春130023

出　　处：《应用化学》2004年第12期1221-1224,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然基金资助项目 ( 2 9873 0 19)

摘　　要：用浸渍法制备了V2 O5/γ Al2 O3 和V2 O5/SiO2 负载型催化剂 ,应用H2 TPR、NH3 TPD、ESR等物理化学技术对其作了表征 ,比较了它们在 5 80℃时对异丁烷脱氢反应的催化性能。结果表明 ,V2 O5/γ Al2 O3 催化剂的脱氢活性较好 ,异丁烷转化率为 35 4 % ,这与γ Al2 O3 表面钒物种易还原 (还原温度为 5 4 2℃ )和分散状态好有关 ;而V2 O5/SiO2 催化剂显示出 96 %的高异丁烯选择性则与SiO2V 2O 5/γ-Al 2O 3 and V 2O 5/SiO 2 catalysts were prepared by the impregnation method and characte- rized by H 2-TPR, NH 3-TPD and ESR. Their catalytic activities were compared in the dehydrogenation of isobutane to isobutene at 580 ℃. The results show that V 2O 5/γ-Al 2O 3 exhibits higher activity than V 2O 5/SiO 2, resulting in 35.4% conversion rate, which is correlated with that vanadium oxide is better dispersed and more easily reduced on γ-Al 2O 3(reduction temperature 542 ℃) than on SiO 2, whereas V 2O 5/SiO 2 exhibits higher selectivity of isobutene higher than V 2O 5/γ-Al 2O 3 due to weaker acidity of the SiO 2 surface than that of the γ-Al 2O 3 surface.

关 键 词：V2O5/γ-Al2O3 V2O5/SiO2  异丁烷  脱氢 

分 类 号：O643.2[理学—物理化学]