| Fe/ZrO2气胶超细粒子催化剂的XAFS研究 |
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| 引用本文： | 胡天斗,相宏伟,谢亚宁,黄达贤,陈贤能,靳亚兰,钟炳,彭少逸.Fe/ZrO2气胶超细粒子催化剂的XAFS研究[J].化学学报,1995,53(11):1082-1087. |
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| 作者姓名： | 胡天斗 相宏伟 谢亚宁 黄达贤 陈贤能 靳亚兰 钟炳 彭少逸 |
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| 作者单位： | 中国科学院高能物理所同步辐射室;中国科学院山西煤炭化学研究所 |
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| 摘 要： | 采用XAFS方法对Fe/ZrO2气凝胶超细粒子催化剂中Fe的近邻结构进行研究。随着催化剂粒减小, Fe/ZrO2远程结构逐渐无序, Fe最近邻Fe-O配位数不变, Fe-O键长略有下降, 次近邻Fe-O配 数和键长均减小, 对于高配位层, 配位数下降更快,Fe的配位环境的影响与催化剂活性和选择性的规律有较好的关联。
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| 关 键 词： | 催化剂 铁 Ｘ射线衍射分析 氧化锆 XAFS |
XAFS study of Fe/ZrO2 aerogel ultrafine particle catalysts |
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| HU TIANDOU,XIANG HONGWEI,XIE YANING,HUANG DAXIAN,CHEN XIANNENG,JIN YALAN,ZHONG BING,PENG SHAOYI.XAFS study of Fe/ZrO2 aerogel ultrafine particle catalysts[J].Acta Chimica Sinica,1995,53(11):1082-1087. |
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| Authors: | HU TIANDOU XIANG HONGWEI XIE YANING HUANG DAXIAN CHEN XIANNENG JIN YALAN ZHONG BING PENG SHAOYI |
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| Abstract: | A series of Fe/ZrO2 catalysts with different particle size has been prepared by the supercritical fluid drying and conventional impregnation methods. The neighboring coordinative environment of iron in these catalysts was investigated by XAFS. The results show that as the particle size of Fe/ZrO2 catalysts is decreased, their structure is disorder gradually, the coordination number of the firts Fe-O shell does not change and their Fe-O bond length has a litter shrink, The coordination number and bond length of the second Fe-O shell are decreased, and coordination number of higher coordination shell decreases very quickly. The correlation between the XAFS results and the activity and selectivity of these catalystst was obtained. |
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| Keywords: | CATALYST IRON X-RAY DIFFRACTION ANALYSIS ZIRCONIUM OXIDE |
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