纳米金催化剂的制备及其对肉桂醛选择性加氢的催化性能  

Preparation of nano Au-supported carbon catalysts and their catalytic performance for selective hydrogenation of cinnamicaldehyde

作　　者：伊秀娟 曾利辉[1,2] 郝郑平 

机构地区：[1]应用表面与胶体化学教育部重点实验室,陕西师范大学化学化工学院,陕西西安710119 [2]西安凯立新材料股份有限公司,陕西西安710201 [3]中国科学院生态环境研究中心,北京100085

出　　处：《工业催化》2016年第3期48-53,共6页Industrial Catalysis

摘　　要：以多壁碳纳米管和椰壳活性炭为载体,分别采用溶胶固载法和等体积浸渍法制备负载型纳米金催化剂。采用N_2吸附-脱附、XRD、TEM和XPS等对碳载体和纳米金催化剂样品进行表征,并研究纳米金催化剂在肉桂醛选择性加氢反应中的催化性能。结果表明,HNO_3-H_2SO_4预处理可以增加碳载体表面的含氧基团和含氮基团,在肉桂醛加氢反应中,溶胶固载法得到的更小尺寸的纳米金催化剂对C=C双键加氢选择性高,等体积浸渍法制备的纳米金催化剂对C=O双键加氢选择性高,椰壳活性炭为载体催化剂的C=C加氢催化活性优于多壁碳纳米管。Nano Au catalysts supported on multi-wall carbon nanotubes（ MWCNTs） and coconut activated carbon（ CAC） were prepared by the sol-gel immobilization technology（ SIT） and the impregnation method（ IMP）,respectively. Carbon supports and nano Au catalysts were characterized by N2 adsorptiondesorption,XRD,TEM and XPS techniques. The catalytic performance of the catalysts for the selective hydrogenation of cinnamaldehyde was evaluated. The results showed that the concentrations of the oxygencontaining groups and nitrogen-containing groups on the surface of carbon supports were increased after pretreating with HNO3-H2SO4 mixed acids. The selectivity of the C=C and/or C=O bonds hydrogenated products in the selective hydrogenation of cinnamaldehyde was significantly affected by the carbon materials and the catalyst preparation methods. The catalyst prepared by the SIT method favored the selective hydrogenation of C=C bonds while the catalyst synthesized by the IMP method tended to the selective hydrogenation of C=O bonds. Moreover,Au/CAC catalyst exhibited clearly better catalytic performance than Au / MWCNTs catalyst for the selective hydrogenation of C=C bonds in the selective hydrogenation of cinnamaldehyde.

关 键 词：催化化学 多壁碳纳米管 椰壳活性炭 纳米金 肉桂醛 加氢 

分 类 号：O643.36[理学—物理化学] TQ426.6[理学—化学]