AMMONIA SYNTHESIS ON MAGNESIA SUPPORTED RUTHENIUM CATALYSTS WITH MESOPOROUS STRUCTURE
AMMONIA SYNTHESIS ON MAGNESIA SUPPORTED RUTHENIUM CATALYSTS WITH MESOPOROUS STRUCTURE
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DOI：
10.1016/j.catcom.2006.05.052
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发表时间：
2007-06
影响因子：
3.7
通讯作者：
Jun-ichi Iwamoto;M. Itoh;Y. Kajita;M. Saito;K. Machida
中科院分区：
文献类型：
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作者：
Jun-ichi Iwamoto;M. Itoh;Y. Kajita;M. Saito;K. Machida
采用溶胶-凝胶法制备了Ru/MgO介孔氨合成催化剂，同时分解Ru羰基配合物。催化性能主要通过氮吸附等温线、氢化学吸附、x射线衍射和透射电镜进行表征。对不同条件下制备的催化剂脱羰基化行为的详细观察表明，羰基配合物作为起泡剂在MgO载体上形成半径为1 ~ 9nm的介孔结构。随着钌羰基配合物浓度的增加，金属的比表面积和分散度均有增加的趋势。结果表明，该系列高表面积（290m2/g）的Ru/MgO催化剂（Ru: 7.1wt%）的氨生成率最高。
Mesoporous Ru/MgO catalysts for ammonia synthesis were prepared by sol–gel method with concurrently decomposing Ru carbonyl complex. The catalytic properties were characterized mainly by means of nitrogen adsorption isotherm, hydrogen chemisorption, X-ray diffraction, and transmission electron microscopy. The detailed observation of decarbonylation behavior on the catalysts prepared under various conditions revealed that the carbonyl complex acted as an effervescent reagent to form a mesoporous structure with radius of 1–9nm on MgO support. Furthermore, both specific surface area and metal dispersion tended to increase with increasing the Ru carbonyl complex concentration. The best ammonia formation rate was consequently observed on the Ru/MgO catalyst (Ru: 7.1wt%) with high surface area (290m2/g) of this series.