纳米Cr2O3的制备、表征及催化性能

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ErgO3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％。

Preparation, Characterization and Catalytic Activity of Nanosized Chromium Oxide

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.