Optimized synthesis method for K/Co3O4 catalyst towards direct decomposition of N2O
Optimized synthesis method for K/Co3O4 catalyst towards direct decomposition of N2O
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DOI：
10.1007/s10853-010-4818-4
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发表时间：
2011-02
影响因子：
4.5
通讯作者：
Hiroaki Yoshino;C. Ohnishi;S. Hosokawa;K. Wada;M. Inoue
中科院分区：
文献类型：
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作者：
Hiroaki Yoshino;C. Ohnishi;S. Hosokawa;K. Wada;M. Inoue
通过将钾源浸渍在商用碳酸钴和均相沉淀法、甘氨酸燃烧法、逐渐氧化法和水热法合成的前驱体上制备了掺钾co3o4催化剂。考察了这些催化剂在有氧和无水蒸气条件下直接分解氧化亚氮的活性。用不同的钾盐浸渍在商品碳酸钴上，考察了钾源对催化剂活性的影响。用KOH水溶液浸渍在商用碳酸钴上制备的催化剂活性最高。采用粉末x射线衍射、n2吸附、扫描电镜、H2程序升温还原、O2程序升温解吸、x射线光电子能谱等方法对制备的催化剂进行了分析。这些结果表明，晶体尺寸和还原性能是影响氧化亚氮在氧气存在下直接分解催化剂活性的关键因素。
The potassium-doped Co3O4catalysts were prepared by impregnation of potassium sources on commercial cobalt carbonate and on the precursors synthesized by homogeneous precipitation, combustion with glycine, gradual oxidation, and hydrothermal methods. The activities of these catalysts for the direct decomposition of nitrous oxide in the presence of oxygen with or without water vapor were examined. The effects of potassium sources on the catalyst activity were also examined by impregnation of various potassium salts on commercial cobalt carbonate. The catalyst prepared by impregnation of an aqueous solution of KOH on commercial cobalt carbonate showed the highest activity. The catalysts prepared by various methods were analyzed by powder X-ray diffraction, N2adsorption, scanning electron microscope, temperature-programmed reduction with H2, temperature-programmed desorption of O2, and X-ray photoelectron spectroscopy. These results suggest that crystallite size and reduction property are key factors for the activity of the catalyst for the direct decomposition of nitrous oxide in the presence of oxygen.