Abstract We synthesized W-substituted CeO2 (W-CeO2) with a fluorite structure by heating precipitates, prepared from Ce(NH4)2(NO3)6 and (NH4)6H2W12O40 aqueous solutions, at 700 °C in air. X-ray diffraction and X-ray fluorescence measurements confirmed successful W substitution into CeO2 with a fluorite structure. X-ray photoelectron spectroscopy revealed that the amount of Ce3+ in W-CeO2 was increased by W substitution. The lattice constant of the W-CeO2, as determined by Rietveld analysis, increased with increasing W content because of the greater Ce3+ content in CeO2. Fourier-transform infrared spectroscopy under a CO2-gas flow indicated that the proportion of hydrogen carbonate species on the surface of W-CeO2 with a W/Ce ratio of 1/6 was considerably larger than that of pure CeO2. The CO2 adsorption isotherms measured at 25 °C showed that W-CeO2 had a larger CO2 adsorption capacity than that of pure CeO2. Thus, the formation of hydrogen carbonate species improved the CO2 adsorption ability of the W-CeO2.

中文翻译：

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W取代CeO 2 粉体的合成及其CO 2 气氛下的CO 2 吸附

摘要 我们通过在空气中 700 °C 加热由 Ce(NH4)2(NO3)6 和 (NH4)6H2W12O40 水溶液制备的沉淀物，合成了具有萤石结构的 W 取代的 CeO2 (W-CeO2)。X 射线衍射和 X 射线荧光测量证实 W 成功取代了具有萤石结构的 CeO2。X 射线光电子能谱表明 W-CeO2 中 Ce3+ 的含量因 W 取代而增加。由 Rietveld 分析确定的 W-CeO2 的晶格常数随着 W 含量的增加而增加，因为 CeO2 中的 Ce3+ 含量更高。CO2 气流下的傅里叶变换红外光谱表明，W/Ce 比为 1/6 的 W-CeO2 表面碳酸氢盐物质的比例远大于纯 CeO2。在 25 °C 下测量的 CO2 吸附等温线表明，W-CeO2 比纯 CeO2 具有更大的 CO2 吸附容量。因此，碳酸氢盐物质的形成提高了 W-CeO2 的 CO2 吸附能力。