物理化学学报 >> 1989, Vol. 5 >> Issue (06): 699-704.doi: 10.3866/PKU.WHXB19890611

研究论文 上一篇    下一篇

在Mo-Bi-Ce/SiO2催化剂上甲醇氧化制甲醛的Redox机理及其动力学

俞启全; 金韵; 张钒; 郭沁林; 桂琳琳   

  1. 北京大学化学系; 北京大学物理化学研究所

  • 收稿日期:1988-05-11 修回日期:1989-05-08 发布日期:1989-12-15
  • 通讯作者: 俞启全

THE REDOX MECHANISM AND KINETICS OF OXIDATION OF METHANOL OVER Mo-Bi-Ce/SiO2 CATALYST

Yu Qiquan; Jin Yun; Zhang Fan; Guo Qinlin; Gui Linlin   

  1. Department of Chemistry; Peking University; Institute of Physical Chemistry; Peking University
  • Received:1988-05-11 Revised:1989-05-08 Published:1989-12-15
  • Contact: Yu Qiquan

摘要: 用外循环无梯度反应器研究了甲醇氧化制甲醛的动力学。动力学实验结果用二步骤Redox模型描述。动力学方程中的参数用线性最小二乘法估计。甲醇的反应级数m和氧的反应级数n与温度有关, m与n的和接近于1, 反应级数的变化可用Redox机理动力学解释。不同处理催化剂的XPS分析结果证实, 反应按Redox机理进行。

Abstract: The kinetics of oxidation of methanol to formaldehyde on Mo-Bi-Ce/SiO_2 catalyst has been investigated in an external recirculation gradientless reactor. The kinetic data can be described by a two-stage redox model. The parameters of the kinetic equation were estimated by the linear least square method. The m-order with respect to methanol and n-order with respect to oxygen depended on the reaction temperature and m+n=1 (the sum of m and n is close to 1). The change of reaction order was interpreted by the kinetics of redox mechanism. XPS results which come from different treated catalysts verify the redox mechanism mentioned above.