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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±2.7kmol~(-1),v_(1d)=10~(13.5±0.9)S~(-1) E_2d=74.4±0.8kJ 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。
In this paper, the adsorption and desorption kinetics of NO on Pd (poly) surface have been investigated by thermal desorption spectroscopy (TDS) and molecular beam relaxation spectroscopy (MBRS). The relaxation of molecular beam at different surface temperatures and different modulation frequencies The experimental results need to be explained by three different models (simple, cohesion coefficient and coverage, and the desorption and detachment model of the branching process) .Furthermore, fitting the experimental data to characterize the kinetic parameters of two different adsorption states Were: E 1d = 104.2 ± 2.7kmol -1, v 1d = 10 ~ 13.5 ± 0.9 S -1 E 2d = 74.4 ± 0.8kJ mol -1, v ~ (2d) = 10 ~ (10.3 ± 0.2) S ~ (-1) Finally, the mechanism of the abnormal state (the second adsorption state) is studied and discussed. The results show that the oxygen generated by the partial decomposition of NO is adsorbed on the surface, s reason.