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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (15): 1537-1542. 上一篇    下一篇

研究论文

ZrxCe1－xO2催化剂催化湿式氧化乙酸的活性研究

王建兵*, 祝万鹏, 杨少霞, 周云瑞   

  1. (清华大学环境科学与工程系 北京 100084)
  • 投稿日期:2005-11-25 修回日期:2006-03-14 发布日期:2006-08-14
  • 通讯作者: 王建兵

Study on Catalytic Wet Air Oxidation of Acetic Acid by ZrxCe1－xO2 Catalyst

WANG Jian-Bing*, ZHU Wan-Peng, YANG Shao-Xia, ZHOU Yun-Rui   

  1. (Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084)
  • Received:2005-11-25 Revised:2006-03-14 Published:2006-08-14
  • Contact: WANG Jian-Bing

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采用共沉淀法制备了ZrxCe1－xO2催化剂, 利用BET, XRD和XPS对其进行了表征, 并研究了催化剂催化湿式氧化乙酸的活性. 结果表明: Zr和Ce摩尔比为1∶9的催化剂催化湿式氧化乙酸时具有最好的活性, 当乙酸溶液的初始化学需氧量(COD)为5000 mg/L, 反应温度为230 ℃, 压力为5 MPa时, 120 min后, COD的去除率为76% . 催化剂具有良好的活性是因为在CeO2中加入Zr能够增大催化剂的比表面积和表面缺陷氧的含量, 并最终加快了HO2•自由基的产生, 从而提高了催化剂的活性.

关键词: 催化湿式氧化, 乙酸, ZrxCe1－xO2催化剂, 废水处理

A series of ZrxCe1－xO2 catalysts were prepared by co-precipitation. They were characterized by BET, XRD and XPS. The catalytic wet air oxidation of acetic acid was carried out with these catalysts. It showed that the ZrxCe1－xO2 catalyst with 1∶9 atomic ratio of zirconium to cerium demonstrated the best activity. At initial chemical oxygen demand (COD) of 5000 mg/L, reaction temperature of 230 ℃ and the pressure of 5 MPa, the removal efficiency of COD was 76% after 120 min. The good activity of this catalyst could be due to adding zirconium into CeO2 which could increase surface area and concentration of surface defect oxygen of the catalyst. This finally accelerated the formation of HO2• radical and improved the activity of catalyst.

Key words: catalytic wet air oxidation, acetic acid, ZrxCe1－xO2 catalyst, wastewater treatment