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本文采用程序升温脱附(TPD)法研究了CO在Cu/ZnO/Al_2O_3型低变催化剂上的脱附动力学。结果表明,在350℃以内,该催化剂对CO显示出一种能量分布的活泼部位,主要由催化剂中的Cu所提供。以T_f法结合脱附速率等温线法进行了TPD谱图的定量解析,求出了脱附动力学参数,建立了脱附速率方程。并发现Cu/ZnO/Al_2O_3型低变催化剂对CO的总有效表面虽为非均匀的,但该催化剂在350℃以内对CO显示的活泼部位所提供的有效表面却具有均匀表面的能量特征。由分析脱附级数,可推测出CO的吸附以缔合式吸附为主。
In this paper, the desorption kinetics of CO on Cu / ZnO / Al_2O_3 catalysts was investigated by temperature programmed desorption (TPD). The results show that at 350 ℃, the catalyst shows an active site for the energy distribution of CO, which is mainly provided by the Cu in the catalyst. The Td method and the desorption rate isotherm method were used to quantitatively analyze the TPD spectra. The desorption kinetics parameters were obtained and the desorption rate equation was established. It is found that the Cu / ZnO / Al 2 O 3 low-shift catalyst has a uniform surface energy distribution but the active surface provided by the CO-active sites within 350 ℃ is nonuniform. From the analysis of desorption series, it can be inferred that the adsorption of CO is dominated by associated adsorption.