Acta Phys. -Chim. Sin. ›› 1990, Vol. 6 ›› Issue (01): 32-38.doi: 10.3866/PKU.WHXB19900106

• ARTICLE • Previous Articles     Next Articles

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

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 ...