助剂对加氢催化剂Ni/SiO_2结构和反应性能的影响

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。

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	陶然
	陈吉祥
	张继炎

关键词： m二硝基苯 m苯二胺负载型镍基催化剂等体积浸渍助剂

Abstract： 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.

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Received 2005-05-15; published 2005-05-15

引用本文:

陶然,陈吉祥,张继炎.助剂对加氢催化剂Ni/SiO_2结构和反应性能的影响[J]. 化学工业与工程, 2005,22(3): 175-178

TAO Ran,CHEN Ji-xiang,ZHANG Ji-yan .Effects of Promoters on Structure and Properties of Ni/SiO_2 Catalysts for Hydrogenation[J]. Chemcial Industry and Engineering, 2005,22(3): 175-178