摘要
采用等体积浸渍法制备了含不同助剂的m 二硝基苯液相催化加氢催化剂Ni/SiO2,利用BET、XRD、TPR和活性评价等方法对催化剂的物化性质和催化性能进行了研究,考察了不同助剂对催化剂结构和反应性能的影响。试验结果表明,向NiO/SiO2催化剂中引入La2O3、K2O及Li2O助剂后提高了催化剂中镍物种的分散度及还原能力,改善了催化剂的反应性能,其中以La2O3和K2O双助剂的作用最为明显。
A series of nickel catalyst samples supported on silica and promoted with different promoters,were prepared by incipient impregnation and used for hydrogenation of m-dinitrobenzene to m-phenylenediamine.Based on the results of nitrogen adsorption-desorption,X-ray diffraction(XRD),temperature-programmed reduction (TPR) and activity evaluation,the physico-chemical properties and catalytic performance of the catayst were investigated.It was found that promoters of La_2O_3,K_2O and Li_2O could enhance the dispersity and the reduction ability of nickel species on the catalyst of Ni/SiO_2,and so they improved the catalytic performance of the catalysts,especially double promoters of La_2O_3 and K_2O.
出处
《化学工业与工程》
CAS
2005年第3期175-178,共4页
Chemical Industry and Engineering
关键词
m-二硝基苯
m-苯二胺
负载型镍基催化剂
等体积浸溃
助剂
m-dinitrobenzene
m-phenylenediamine
supported nickel-based catalyst
incipient impregnation
promoter
