催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (3): 213-217.

• 研究论文 • 上一篇    下一篇

蛋壳型Pd/a-Al2O3催化剂的制备及活性

刘秀芳, 计扬, 李伟, 肖文德   

  1. 华东理工大学联合化学反应工程研究所, 上海 200237
  • 收稿日期:2009-03-25 出版日期:2009-03-25 发布日期:2012-12-19

Preparation and Catalytic Activity of Egg-Shelled Catalyst Pd/a-Al2O3

LIU Xiufang, JI Yang, LI Wei, XIAO Wende*   

  1. UNILAB, Research Centre of Chemical Reaction Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2009-03-25 Online:2009-03-25 Published:2012-12-19

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摘要： 采用浸渍法制备了蛋壳型Pd/?-Al2O3催化剂, 并用于CO和亚硝酸甲酯气相合成草酸二甲酯反应, 考察了活性层厚度对催化剂活性的影响. 采用偏光显微镜和电感耦合等离子光谱技术对催化剂进行了表征. 结果表明, 调节前驱体溶液的pH值可以控制活性组分在载体上的分布, 从而得到不同钯层厚度的催化剂. 这种活性组分位于催化剂外表面的蛋壳型催化剂可以提高活性组分的利用, 使亚硝酸甲酯的转化率较高. 另外考察了活性组分Pd负载量对催化剂浸渍深度和活性的影响, 确定了催化剂活性组分的适宜负载量为0.10%, 浸渍深度为16 um.

关键词: 蛋壳型催化剂, 钯, 氧化铝, 亚硝酸甲酯, 草酸二甲酯

Abstract: Egg-shelled Pd/α-Al2O3 catalysts with different active layers were prepared by impregnation. The catalytic activity for the synthesis of dimethyl oxalate from CO and methyl nitrite was investigated. The catalyst pellets were characterized by polarized optical microscopy. For obtaining high methyl nitrite conversion and dimethyl oxalate yield, the active component of palladium should be placed in a thin layer at the external surface of the pellet.

Key words: egg-shelled catalyst, palladium, alumina, methyl nitrite, dimethyl oxalate