乙酸在SmOx/Rh(100)模型表面上的吸附和分解

 用高分辨电子能量损失谱（HREELS）和热脱附谱（TDS）研究了\r\n乙酸在SmOx／Rh（100）模型表面上的吸附与分解．结果表明：低温下\r\n吸附乙酸时，SmOx的加入明显促进了乙酸分子中O－H键的断裂，从而有\r\n利于乙酸根的形成；升高表面温度，SmOx的存在促进了乙酸根中C－C键\r\n的断裂，有利于乙酸根的进一步分解．120K时，乙酸在SmOx／Rh（100\r\n）上主要以乙酸根的形式存在．225K时，乙酸根即可发生以生成CO为主\r\n的脱羧反应．在417和477K观察到受表面脱羧反应控制的CO2和H2的脱附\r\n峰．对反应的机理进行了讨论．

Adsorption and Decomposition of Acetic Acid on SmO x/Rh(100) Model Surface

The adsorption and decomposition of acetic acid on SmO x /Rh(100) model surface were investigated with high resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). The presence of SmO x weakened O H bond in acetic acid molecules and therefore facilitated the formation of adsorbed acetate at 120 K. Increasing the temperature, the addition of SmO x promoted further the decomposition of adsorbed acetate by weakening C C bond. Upon adsorption on SmO x /Rh(100) surface at 120 K, most acetic acid molecules produced adsorbed acetate species via O H bond cleavage. When the sample was heated to about 225 K, the decarboxylation of acetate occurs and CO is the main product. The CO 2 and H 2 peaks were also observed at 417 K and 477 K, which could be attributed to reaction limited products. The reaction mechanism was also discussed in this paper.