| 纳米Cr2O3的制备、表征及催化性能 |
| Preparation, Characterization and Catalytic Activity of Nanosized Chromium Oxide |
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| 摘要: 首次采用溶胶-凝胶法与共沸蒸馏法耦合技术制备了纳米Cr2O3粉体,并运用BET、TEM、XRD、FT-IR、XPS及H2-TPR对其进行表征,同时采用CO2氧化乙烷脱氢制乙烯反应作为探针反应,考察了纳米Cr2O3的催化性能.首次发现纳米Cr2O3的FT-IR谱出现了蓝移现象,并且630cm-1附近的伸缩振动峰强度增强.初步探讨了纳米氧化物的IR蓝移和红移的原因,指出晶型是影响纳米氧化物红外光谱特征的重要因素.实验结果表明纳米Cr2O3上乙烷和CO2转化率均明显高于常规Cr2O3催化剂;在700℃下,乙烷转化率高达77.1%,而乙烯产率达到了58.98%. |
| 关键词: 纳米Cr2O3 表征 红外光谱 催化性能 |
| 基金项目: 国家863计划资助项目(No.2001AA07010) |
| Abstract: In this paper, the nanosized Cr2O3 were prepared by Sol-Gel method coupling with azeotropic distillation method. The obtained nano-powders were characterized by BET, XRD, TEM, FT-IR, XPS and H2-TPR techniques. FT-IR patterns revealed that the infrared absorption peaks of Cr-O bond in Cr2O3 nano-powders blue shift and the intensity of the absorption of Cr-O bond (651.8cm-1) increases. The mechanism of red shift and blue shift in nano-powders of oxides was discussed, and it was concluded that the crystal structure of nano-powders of oxides influences their infrared spectra. The catalytic performance of nano-Cr2O3 catalyst for oxidative dehydrogenation of ethane with CO2 was compared with that of normal Cr2O3 catalyst. The nano-Cr2O3 catalyst exhibits much higher ethane conversion and higher ethylene yield than those of normal Cr2O3 catalyst. At 973K, nano-Cr2O3 catalyst shows 77.1% ethane conversion and 58.98% ethylene yield for the oxidative dehydrogenation of ethane with carbon dioxide to ethylene. |
| Keywords: nano Cr2O3 characterization FT-IR catalytic activity |
| 投稿时间：2003-01-23 修订日期：2003-05-16 |
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| 邓双,李会泉,张懿.纳米Cr2O3的制备、表征及催化性能[J].无机化学学报,2003,19(8):825-830. |
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