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应用红外光谱技术研究了CO和NO及其混合气体在还原态CuO/γ-Al_2O_3上的吸附.XRD分析样品物相仅有Cu~0,但是,XPS和IR都证明样品表面上除Cu~0外,还有Cu~(2+)和Cu~+。CO以分子态的形式吸附在Cu~+和Cu~0上(低于173K,无NO存在时,CO可以吸附在Cu~(2+)上);NO以分子态吸附在Cu~(2+)上,在Cu~0上为离解吸附(173K以下,无CO存在时,NO可以吸附在Cu~+上)。CO吸附时,表面还生成HCO_3~-、CO_3~(2-)、HCOO~-,NO吸附时,除被氧化为NO3~-外,表面上还出现N_2O物种;高于室温时,CO和NO共吸附,表面上除生成HCO_3~-、CO_3~(2-)和N_2O外,还有NCO~-物种生成,讨沦了CO和NO反应的基本步骤。
The adsorption of CO and NO and their mixed gases on CuO / γ-Al 2 O 3 reduced was studied by FTIR spectroscopy. The XRD analysis showed that the phases of the samples were only Cu ~ 0. However, both XPS and IR proved that the addition of Cu ~ 0 In addition, there are Cu ~ (2+) and Cu ~ +. CO adsorbed on Cu ~ + and Cu ~ 0 in the molecular state (less than 173K, CO could be adsorbed on Cu ~ (2+) in the absence of NO) ) On Cu ~ 0 for the dissociative adsorption (173K or less, in the absence of CO, NO can be adsorbed on the Cu ~ +). When CO was adsorbed on the surface, HCO 3 -, CO 3 - (2 -) and HCOO - - were adsorbed on the surface, and N 2 O species appeared on the surface except for NO 3 -. When higher than room temperature, CO and NO In addition to the formation of HCO_3 ~ -, CO_3 ~ (2-) and N_2O on the surface, there are also NCO ~ - species formation, discussing the basic steps CO and NO reaction.