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化学学报
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化学学报 ›› 2004, Vol. 62 ›› Issue (3): 262-267. 上一篇    下一篇

研究论文

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

马宁, 乐英红, 华伟明, 高滋   

  1. 复旦大学化学系, 分子催化和功能材料重点实验室, 上海, 200433
  • 投稿日期:2003-03-28 修回日期:2003-11-10 发布日期:2014-01-26
  • 通讯作者: 高兹,E-mail:zigao@fudan.edu.cn E-mail:zigao@fudan.edu.cn
  • 基金资助:
    国家重点基础研究发展规划(No.G2000077507)和上海市重大基础研究(No.03DJ14004)资助项目.

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

MA Ning, YUE Ying-Hong, HUA Wei-Ming, GAO Zi   

  1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433
  • Received:2003-03-28 Revised:2003-11-10 Published:2014-01-26

PDF

519

被引次数

26

研究了以H2O2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MgFe2O4尖晶石相,苯甲醛产率达到20%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33.4%.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-Fe2O3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-Fe2O3微晶相的存在也可能是造成非化学计量比催化剂活性高的原因之一.

关键词: 苯乙烯选择氧化, 苯甲醛, Mg-Fe尖晶石复合氧化物

Selective oxidation of styrene to benzaldehyde with H2O2 as oxidant on Mg-Fe spinel complex oxide catalysts was studied. Non-stoichiometric Mg-Fe spinel complex oxides are more active than pure MgFe2O4 spinel for the reaction. The yield reaches 20% on the former catalysts. Substituting Al3+ for Fe3+ 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-Fe2O3 crystallites by XRD, TEM and TPR techniques. The existence of nano-sized α-Fe2O3 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.

Key words: selective oxidation of styrene, benzaldehyde, Mg-Fe spinel complex oxide