活性炭负载钴纳米催化剂的制备与表征

Preparation and Characterization of Active Carbon Supported Cobalt Nanoparticle Catalyst

采用高温液相还原法,以无水氯化钴为金属前驱体、三乙基硼氢化锂为还原剂、表面活性剂三苯基磷(TPP)和油酸(OA)为保护剂,制备了一系列粒径不同的钴纳米颗粒,并将其负载到活性炭(AC)上,得到活性炭负载的不同粒径的金属钴纳米催化剂。结果表明,通过调节两种表面活性剂的摩尔比可有效控制钴纳米颗粒的粒径;同期负载优于非同期负载;多种载体负载的催化剂以活性炭负载效果最佳,钴纳米颗粒粒径分布窄且分散性好。采用电子透射显微镜(TEM)、N2吸附-脱附和X-射线粉末衍射(XRD)对催化剂进行了表征。

Using anhydrous cobalt chloride as cobalt precursor,C6H16 BLi as reducing agent,surfactant oleic acid（OA） and triphenylphosphine（TPP） as protective agent,Co nanoparticles was synthesized at high temperature by liquid phase reduction method.The Co nanoparticles were supported on active carbon（AC） to get the catalyst Co/AC.The results showed that by adjusting the molar ratio of OA to TPP,the size of Co nanoparticles and Co/AC could be controlled.The synchronized supporting method was better than the unsynchronized supporting method.Comparing with SiO2 and SBA-15 supported Co nanoparticle catalysts,the catalyst Co/AC displayed the best Co nanoparticle distribution and the narrowest dispersion.The prepared Co nanoparticles and Co/AC were characterized by transmission electron microscopy（TEM）,nitrogen adsorption-desorption,and X-ray powder diffraction（XRD）.