物理化学学报 >> 1995, Vol. 11 >> Issue (01): 38-45.doi: 10.3866/PKU.WHXB19950108

研究论文 上一篇    下一篇

气相存在下CO在Pd上非线性脱附动力学的研究

辛梅, 翟润生, 张林虎, 郭燮贤   

  1. 中国科学院大连化学物理研究所|催化基础国家重点实验室|大连 116023
  • 收稿日期:1993-12-20 修回日期:1994-03-08 发布日期:1995-01-15
  • 通讯作者: 辛梅

A Study on the Nonlinear Kinetics of CO Desorption under the Gas Ambience on Pd

Xin Mei, Zhai Run-Sheng, Zhang Lin-Hu, Guo Xie-Xian   

  1. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Academia Sinica,Dalian 116023
  • Received:1993-12-20 Revised:1994-03-08 Published:1995-01-15
  • Contact: Xin Mei

摘要:

利用同位素技术测定了预吸附在Pd表面上的CO在单一及混合同位素气氛下的脱附动力学.实验发现CO的脱附动力学是非线性的,在饱和表面上为一级加二级.在易位化学吸附模型和协同交换机理的基础上,对表面吸附物种的动态结构进行了深入分析讨论,并推导出了非线性脱附动力学的解析表达式.

关键词: 吸附, 脱附, 交换, 动力学

Abstract:

The kinetics of CO desorption on Pd(111) has been studied by using isotope switch method under the gas-phase pressures of single isotope and mixed ones. The experiments show that the desorption kinetics is non-linear and is first order plus second order on the saturated surface. Based on the delocalized chemisorptions model and gas-surface exchange mechanism, the analytic expressions for the desorption kinetics are derived and a dynamic reasoning of the non-linear kinetics has been described in detail.

Key words: Adsorption, Desorption, Exchange, Kinetics