Mg-Fe尖晶石复合氧化物对苯乙烯选择氧化反应的催化性能  

Selective Oxidation of Styrene on Mg-Fe Spinel Complex Oxide Catalysts

作　　者：马宁[1] 乐英红[1] 华伟明[1] 高滋[1] 

机构地区：[1]复旦大学化学系分子催化和功能材料重点实验室

出　　处：《化学学报》2004年第3期262-267,共6页Acta Chimica Sinica

基　　金：国家重点基础研究发展规划 (No .G2 0 0 0 0 7750 7);上海市重大基础研究 (No .0 3DJ1 4 0 0 4 )资助项目

摘　　要：研究了以H2 O2 为氧化剂时Mg Fe尖晶石复合氧化物催化剂对苯乙烯选择氧化制苯甲醛反应的催化性能 .结果表明 ,非化学计量比的Mg Fe尖晶石复合氧化物催化剂的活性优于纯MgFe2 O4尖晶石相 ,苯甲醛产率达到 2 0 %左右 .在非化学计量比的Mg Fe尖晶石复合氧化物中掺入适量的Al3 + 后 ,可进一步提高催化活性 ,苯甲醛最高产率达到 3 3 .4% .催化剂表征数据揭示 ,非化学计量比的Mg Fe和Mg Fe Al复合氧化物催化剂是由纳米尺度的铁酸盐尖晶石和α Fe2 O3 微晶相构成的 .除了非化学计量比尖晶石具有较多的缺陷结构外 ,α Fe2 O3Selective oxidation of styrene to benzaldehyde with H 2O 2 as oxidant on Mg-Fe spinel complex oxide catalysts was studied. Non-stoichiometric Mg-Fe spinel complex oxides are more active than pure MgFe 2O 4 spinel for the reaction. The yield reaches 20% on the former catalysts. Substituting Al 3+ for Fe 3+ in the non-stoichiometric Mg-Fe spinel complex oxide, the activity of the catalyst enhances and the highest yield is 33.4%. It is revealed that the non-stoichiometric Mg-Fe and Mg-Fe-Al spinel complex oxide catalysts are composed of nano-sized ferrite spinel and α-Fe 2O 3 crystallites by XRD, TEM and TPR techniques. The existence of nano-sized α-Fe 2O 3 crystallites in the non-stoichiometric Mg-Fe spinel complex oxide catalysts is also responsible for the enhanced catalytic activity besides the defect structure in them.

关 键 词：镁-铁尖晶石复合氧化物 苯乙烯 选择氧化 催化性能 苯甲醛 过氧化氢 

分 类 号：O643.3[理学—物理化学]