Ozensoy Emrah, Peden Charles H F, Szanyi János
Institute for Interfacial Catalysis, Pacific Northwest National Laboratory, P. O. Box 999, MSIN K8-93, Richland, Washington 99352, USA.
J Phys Chem B. 2005 Aug 25;109(33):15977-84. doi: 10.1021/jp052053e.
Interaction of NO2 with an ordered theta-Al2O3/NiAl(100) model catalyst surface was investigated using temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). The origin of the NO(x) uptake of the catalytic support (i.e., Al2O3) in a NO(x) storage catalyst is identified. Adsorbed NO2 is converted to strongly bound nitrites and nitrates that are stable on the model catalyst surface at temperatures as high as 300 and 650 K, respectively. The results show that alumina is not completely inert and may stabilize some form of NO(x) under certain catalytic conditions. The stability of the NO(x) formed by exposing the theta-Al2O3 model catalyst to NO2 adsorption increases in the order NO2 (physisorbed or N2O4) < NO2 (chemisorbed) < NO2- < NO3-.
使用程序升温脱附（TPD）和X射线光电子能谱（XPS）研究了NO₂与有序的θ-Al₂O₃/NiAl(100)模型催化剂表面的相互作用。确定了NOₓ储存催化剂中催化载体（即Al₂O₃）对NOₓ的吸附来源。吸附的NO₂分别转化为在高达300 K和650 K的温度下在模型催化剂表面稳定的强结合亚硝酸盐和硝酸盐。结果表明，氧化铝并非完全惰性，在某些催化条件下可能会稳定某种形式的NOₓ。通过将θ-Al₂O₃模型催化剂暴露于NO₂吸附而形成的NOₓ的稳定性按以下顺序增加：NO₂（物理吸附或N₂O₄）＜NO₂（化学吸附）＜NO₂⁻＜NO₃⁻。
