物理化学学报 >> 1990, Vol. 6 >> Issue (01): 32-38.doi: 10.3866/PKU.WHXB19900106

研究论文 上一篇    下一篇

NO在Pd表面吸附与脱附动力学的研究

席光康;宝建中;邵淑敏;李胜林   

  1. 南开大学电子科学系
  • 收稿日期:1988-05-17 修回日期:1989-01-21 发布日期:1990-02-15
  • 通讯作者: 席光康

Investigation of Adsorption-Desorption Kinetics of NO on Pd Surface

Xi Guang-Kang;Bao Jian-Zhong;Shao Shu-Min;Li Sheng-Lin   

  1. Department of Electron Science,Nankai University,Tianjin
  • Received:1988-05-17 Revised:1989-01-21 Published:1990-02-15
  • Contact: Xi Guang-Kang

摘要: 本文用热脱附谱(TDS)与分子束张弛谱(MBRS)方法对NO在Pd(poly)表面上吸附与脱附动力学进行了研究. 对不同表面温度及不同调制频率下分子束张弛谱的实验结果需用三种不同的模型(简单的、粘着系数与复盖度有关的及分支过程的吸脱附模型)来解释.与实验数据拟合所得表征两种不同吸附态的动力学参数为:
E_(1d)=104.2±2.7 kmol~(-1), v_(1d)=10~(13.5±0.9)S~(-1)
E_2d=74.4±0.8 kJ mol~(-1), v~(2d)=10~(10.3±0.2)S~(-1)
最后对非常态(第二吸附态)的机制进行了研究与讨论, 研究表明NO部分分解产生的氧吸附在表面是引起非常态的原因。

Abstract: The interactions between NO and transition metal surfaces have received consi-derable attention because of the practical importance for NO removal in industrial and automotive catalytic converters. Adsorption-desorption kinetics of NO on Pd(poly) has been studied with Thermal Desorption Spectrum(TDS)and Molecular Beam Relaxation Spectrometry (MBRS) methods. There are three different models (simple, coverage dependence of sticking coefficient and branch process adsorption-desorption models) for explaining experimental results of MBRS in different surface temperature ranges and different modulation frequencies. Best fits to the kinetic parameters characteri-zing the two adsorbed states are as follows:
E_(1d)=104.2±2.7 kmol~(-1), v_(1d)=10~(13.5±0.9)S~(-1)
E_2d=74.4±0.8 kJ mol~(-1), v~(2d)=10~(10.3±0.2)S~(-1)
Finally, the mechanism of unsual adsorbed state ...