作　　者： ; ; ; ; ; ; ;

机构地区： 华南理工大学轻工与食品学院制浆造纸工程国家重点实验室

出　　处： 《催化学报》 2008年第8期753-757,共5页

摘　　要： 利用溶胶-凝胶法制备了钙钛矿型复合氧化物LaFeO3,利用X射线衍射、扫描电子显微镜、X射线光电子能谱和N2吸附等表征手段考察了所制备样品的结构、形貌、表面物种和比表面积,并将其作为催化剂用于木质素湿法氧化合成芳香醛的反应中.结果表明,该催化剂具有较高的活性和稳定性.在适当的反应条件下,LaFeO3催化剂能显著提高木质素的转化率以及各芳香醛的产率,紫丁香醛的产率提高幅度大于香草醛和对羟基苯甲醛,紫丁香醛的最大产率是无催化剂反应时的1.85倍.催化剂连续使用5次后仍能保持较高的活性,且体相结构没有发生明显的变化. The perovskite-type oxide LaFeO3 catalyst was prepared by the sol-gel method. The structure, shape, particle size, surface species, and specific surface area of the catalyst were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and N2 adsorption. The catalyst was used for wet oxidation of lignin to aromatic aldehydes and showed high activity and stability. Compared with a non- catalytic process, lignin conversion and yield of each aromatic aldehyde increased significantly, among which the yield of syringaldehyde was the highest. The maximum yield of syringaldehyde was 1.85 times that of the noncatalytic process. The activity and perovskite-type structure of the LaFeO3 catalyst almost remained unchanged after five successive operations.

关 键 词： 钙钛矿氧化物 木质素 催化湿法氧化 芳香醛 重复使用性

领　　域： [理学] [理学]