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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (5): 403-408. 上一篇    下一篇

研究论文

Ag/ZrO2催化剂上的1,2-丙二醇选择性气相氧化反应

沈江, 杜俊明, 黄静静, 杨新艳, 沈伟*, 徐华龙, 范康年   

  1. (复旦大学化学系和上海市分子催化与功能材料重点实验室 上海 200433)
  • 投稿日期:2005-08-06 修回日期:2006-01-23 发布日期:2007-03-14
  • 通讯作者: 沈伟

Gas-phase Selective Oxidation of 1,2-Propylene Glycol over Ag/ZrO2 Catalyst

SHEN Jiang; DU Jun-Ming; HUANG Jing-Jing; YANG Xin-Yan; SHEN Wei*; XU Hua-Long; FAN Kang-Nian   

  1. (Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433)
  • Received:2005-08-06 Revised:2006-01-23 Published:2007-03-14
  • Contact: SHEN Wei

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采用浸渍法制备了一系列Ag/ZrO2催化剂, 考察了Ag/ZrO2催化剂对1,2-丙二醇选择性氧化合成丙酮醛反应的催化性能. 实验结果表明: 在原料气配比为V(N2)∶V(O2)＝300∶19, n(O2)/n(alcohol)＝1.2, 反应物液时空速为3.2 g/(g•h), 反应温度为673 K时, 1,2-丙二醇选择性氧化合成丙酮醛反应的转化率为95.7%, 选择性为55.3%, 高于传统电解银催化剂. UV-Vis DRS和XPS的研究结果表明: 在Ag/ZrO2催化剂上存在大量的Ag＋和Agnδ＋有利于促进催化活性的提高.

关键词: 1,2-丙二醇, 丙酮醛, α-羟基丙酮, 银, 氧化锆, 电子态, 紫外可见漫反射

A series of Ag/ZrO2 catalysts were prepared by impregnation method. The catalytic performance for selective oxidation of 1,2-propylene glycol to methyl glyoxal was investigated. Under optimum reaction conditions [V(N2)∶V(O2)＝300∶19, n(O2)/n(alcohol)＝1.2, LHSV＝3.2 g/(g•h) and temperature＝673 K], the conversion of 1,2-propylene glycol got to 95.7%, and the selectivity to methyl glyoxal was 55.3%, being higher than that over conventional electrolytic silver catalyst. The UV-vis DRS and XPS results indicated that the existence of large amount of Ag＋ and Agnδ＋ in Ag/ZrO2 catalysts contributes to the enhancement of catalytic activity.

Key words: 1,2-propylene glycol, methyl glyoxal, α-hydroxyacetone, silver, zirconia, electronic state, UV-vis DRS