CeO2 负载NiCo 双金属催化苯酚液相加氢  

CeO2 Supported NiCo Bimetal Catalyzes Liquid Phase Hydrogenation of Phenol

作　　者：鲁金芝 马占伟[1] 魏雪梅 张勤生[1] 胡斌[1] LU Jin-zhi;MA Zhan-wei;WEI Xue-mei;ZHANG Qin-sheng;HU Bin(State Key Laboratory for Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049

出　　处：《分子催化》2020年第1期36-44,I0002,共10页Journal of Molecular Catalysis(China)

基　　金：This research was financially supported by the CAS“Light of West China”Program。

摘　　要：采用湿化学浸渍法制备了CeO2纳米棒负载的CoNi双金属催化剂,并研究了其在150℃,3 MPa H2下对苯酚加氢成环己醇反应的催化活性,发现具有合适NiCo质量比的NiCo/r-CeO2催化剂显示出比单金属催化剂高的催化活性.通过TEM和XRD证明了NiCo合金的形成和高分散性,H2-TPR和CO2-TPD揭示了合金中钴和镍之间的电子相互作用导致金属与载体之间的相互作用力发生变化,XPS也表明NiCo合金中Ni和Co的电子态也发生了变化.结合表征结果和双金属催化剂催化苯酚加氢反应的活性,表明添加Co可以调节活性部位的表面性能,进而影响NiCo双金属催化剂在苯酚加氢反应中的催化活性.CeO2 nanorods-supported CoNi bimetallic catalysts was prepared by a simple wet chemical impregnation method,and the catalytic activity was tested by the hydrogenation of phenol to cyclohexanol at 150℃under 3 MPa H2.It was found that Ni-Co/r-CeO2(Ni∶Co=1∶1)catalysts showed higher activity than monometallic catalysts.The formation and dispersion of the NiCo alloy is demonstrated by Transmission electron microscopy(TEM)and X-ray powder diffraction(XRD).Temperature programmed reduction of H2(H2-TPR)and temperature programmed desorption of CO2(CO2-TPD)revealed the electronic interaction between the cobalt and nickel in the alloy,which causes the interaction force between the metal and the carrier to change.The formation of NiCo alloy changes the electronic states of Ni and Co was also revealed by X-ray photoelectron spectroscopy(XPS).Combined with the characterization results and phenol conversion,it is shown that the addition of Co modulates the surface properties of the active sites,which in turn affects the catalytic activity of metallic NiCo in the phenol hydrogenation reaction.

关 键 词：钴 镍 双金属 苯酚加氢 电子效应 

分 类 号：O643.36[理学—物理化学]