铁/介孔碳球的制备及其催化氧化苯乙烯生成苯甲醛  

Iron/mesoporous carbon spheres preparation and its application in catalytic oxidation of styrene to benzaldehyde

作　　者：孙琪[1] 李念哲 

机构地区：[1]辽宁师范大学化学化工学院,辽宁大连116029

出　　处：《辽宁师范大学学报（自然科学版）》2017年第4期490-495,共6页Journal of Liaoning Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(21173110)

摘　　要：在葡萄糖中加入丙烯酸,水热合成碳化得到富含羧基和介孔的"荔枝状"单分散碳球,与硝酸铁溶液交换Fe3+后得到Fe/C(A)催化剂.考察了该催化剂的丙烯酸加入量、硝酸铁溶液浓度、离子交换温度和交换时间等制备条件.并用最优催化剂考察了苯乙烯氧化反应的反应温度、催化剂用量、过氧化氢与苯乙烯体积比、溶剂、反应时间等对反应的影响.利用XRD、SEM、BET、TG-DTA、FT-IR和XPS等表征手段考察了Fe/C(A)催化剂表面形貌、表面基团,证实了Fe^(3+)在催化剂表面高度分散并且与羧基发生了化学作用.Fe作为催化剂Fe/C(A)的主要活性位,可以催化过氧化氢分解出自由基,进而氧化苯乙烯生成苯甲醛.自由基抑制剂证实了该反应遵循自由基过程.Litchi-like monodisperse carbon spheres from hydrothermal synthesis of D-glucose and acrylic acid which are rich in carboxyl and mesoporous exchanged Fe-（3＋）with ferric nitrate solution in order to get Fe/C（A）.The dosage of acrylic acid,the concentration of ferric nitrate solution,exchange temperature and time were observed,and the dosage of catalyst,the volume ratio of hydrogen peroxide to styrene,the type of solvent,temperature and time were investigated using the optimal catalyst.The mechanism of free radical was proved to exist in the oxidation reaction.The surface morphology and functional groups of Fe/C（A）indicated that Fe-（3＋）was highly dispersed on the surface of the catalyst and reacted with carboxyl by using XRD,SEM,BET,TG-DTA,and FT-IR characterization.Fe as the main active site catalyzed hydrogen peroxide to decompose free radicals which oxidated styrene to benzaldehyde.

关 键 词：介孔碳球 铁离子 苯甲醛 苯乙烯 过氧化氢 

分 类 号：O643.322[理学—物理化学]