Preparation and Research on Ultrafine Cerium-Manganese Aerogel by Supercritical Fluid Drying Technology
来源期刊：Journal of Rare Earths2006年第S2期
论文作者：欧阳俊波 张光德 余高奇 余秋兰 汪厚植
文章页码：119 - 123
摘 要：Using Ce2（CO3）3·6H2O and Mn（NO3）2 as raw material, the ultrafine Ce-Mn aerogel was prepared by sol-gel and supercritical fluid drying technology, and calcined the aerogel at 850 ℃ to obtain nanometer powder. The samples were characterized by means of FT-IR, XRD, TEM and TG-DTA. The effect of preparation methodology and temperature on crystalline state, appearance and size were examined, then through "NO+CO" reaction its catalytic activity was check. The results show as follows: （1） The method can get brown-tan, well-dispersed ultrafine powder which has better fluidity and seems very loose; the sample particles assume globosity and its pellet diameter is about 10 nm. （2） Ultrafine CeO2 and Mn2O3 can be got at 850 ℃ by calcination of Ce-Mn aerogel; however, because of powder sintering, the size of the grain increases to 20～30 nm. （3） The catalytic activity of Ce-Mn aerogel is limited for the reaction "NO+CO".
欧阳俊波，张光德，余高奇，余秋兰，汪厚植
摘 要：Using Ce2（CO3）3·6H2O and Mn（NO3）2 as raw material, the ultrafine Ce-Mn aerogel was prepared by sol-gel and supercritical fluid drying technology, and calcined the aerogel at 850 ℃ to obtain nanometer powder. The samples were characterized by means of FT-IR, XRD, TEM and TG-DTA. The effect of preparation methodology and temperature on crystalline state, appearance and size were examined, then through "NO+CO" reaction its catalytic activity was check. The results show as follows: （1） The method can get brown-tan, well-dispersed ultrafine powder which has better fluidity and seems very loose; the sample particles assume globosity and its pellet diameter is about 10 nm. （2） Ultrafine CeO2 and Mn2O3 can be got at 850 ℃ by calcination of Ce-Mn aerogel; however, because of powder sintering, the size of the grain increases to 20～30 nm. （3） The catalytic activity of Ce-Mn aerogel is limited for the reaction "NO+CO".
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