Department of Energy Conversion and Storage, Technical University of Denmark, DK-4000 Roskilde, Denmark.
J Phys Chem A. 2012 Mar 15;116(10):2497-505. doi: 10.1021/jp300608d. Epub 2012 Mar 7.
In the present work diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy is applied to study the adsorption of NO(x) at 300-500 °C in different atmospheres on gadolinium-doped ceria (CGO), an important material in electrodes investigated for electrochemical NO(x) removal. Furthermore, the effect on the NO(x) adsorption when adding K(2)O or BaO to the CGO is investigated. The DRIFT study shows mainly the presence of nitrate species at 500 °C, whereas at lower temperature a diversity of adsorbed NO(x) species exists on the CGO. The presence of O(2) is shown to have a strong effect on the adsorption of NO, but no effect on the adsorption of NO(2). Addition of K(2)O and BaO dramatically affects the NO(x) adsorption and the results also show that the adsorbed NO(x) species are mobile and capable of changing adsorption state in the investigated temperature range.
在本工作中，采用漫反射红外变换（DRIFT）光谱法研究了在 300-500°C 不同气氛下，NO(x)在掺钆氧化铈（CGO）上的吸附，CGO 是用于电化学去除 NO(x)的电极中研究的重要材料。此外，还研究了在 CGO 中添加 K(2)O 或 BaO 对 NO(x)吸附的影响。DRIFT 研究表明，在 500°C 时主要存在硝酸盐物种，而在较低温度下，CGO 上存在多种吸附的 NO(x)物种。结果表明，O(2)的存在对 NO 的吸附有很强的影响，但对 NO(2)的吸附没有影响。添加 K(2)O 和 BaO 会显著影响 NO(x)的吸附，结果还表明，吸附的 NO(x)物种是可移动的，并能够在研究的温度范围内改变吸附状态。
