催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (6): 566-570.

• 研究论文 • 上一篇    下一篇

采用柠檬酸合成高分散铜催化剂用于选择氢解反应

Ming-Hoong LOOI, Shuk-Tong LEE, Sharifah Bee ABD-HAMID   

  1. 马来西亚大学研究生院组合技术和催化研究中心, 吉隆坡 50603, 马来西亚
  • 收稿日期:2008-06-25 出版日期:2008-06-25 发布日期:2012-04-28

Use of Citric Acid in Synthesizing a Highly Dispersed Copper Catalyst for Selective Hydrogenolysis

Ming-Hoong LOOI, Shuk-Tong LEE, Sharifah Bee ABD-HAMID   

  1. Combinatorial Technology and Catalysis Research Centre, Institute of Postgraduate Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
  • Received:2008-06-25 Online:2008-06-25 Published:2012-04-28

摘要： 采用柠檬酸和浸渍法制备了高分散的负载铜催化剂,并运用N2吸附, X射线衍射和程序升温还原技术对采用或不采用柠檬酸制备样品的过程进行了表征. 结果表明,浸渍后得到的催化剂前驱体是无定形的,通过焙烧很容易转化为晶相的CuO. 采用柠檬酸制得的催化剂上CuO颗粒大小均一,高度分散,在更低的温度下就可还原为Cu. 在月桂酸甲酯氢解为十二烷醇的反应中,其催化活性比未采用柠檬酸制得的样品高一个数量级.

关键词: 浸渍法, 高分散, 负载催化剂, 铜, 氢解

Abstract: A highly dispersed Cu catalyst supported on silica was prepared by an incipient wetness impregnation method with citric acid. The synthesis was studied by nitrogen physisorption, X-ray diffraction, and temperature programmed reduction by comparing with a reference prepared without citric acid. The catalyst precursor obtained after impregnation was X-ray amorphous. The precursor was readily transformed to crystalline CuO upon calcination. The CuO particles were of uniform size in a highly dispersed state and can be reduced to Cu at a lower temperature. The activity of the Cu catalyst obtained was an order of magnitude higher than that of the reference for the hydrogenolysis of methyl laurate to dodecanol.

Key words: incipient wetness impregnation, highly dispersed, copper, supported catalyst, citric acid, hydrogenolysis