Abstract
The oxidative dehydrogenation of ethane into ethylene by carbon dioxide over an unsupported Cr 2O 3 and several supported Cr 2O 3 catalysts on metal oxides such as Al 2O 3, SiO 2, TiO 2, and ZrO 2 was investigated and the effect of support on the catalytic activity was studied. The unsupported Cr 2O 3 shows medium catalytic activity in this reaction; the support will exert a quite different effect on catalytic behavior. The catalytic activity varies with the nature of supports. Cr 2O 3/SiO 2 catalysts exhibit an excellent performance in this reaction. Cr 2O 3 loading also affects the catalytic activity; 8 wt.% Cr 2O 3/SiO 2 catalysts can produce 55.5% ethylene yield at 61% ethane conversion at 650°C. Characterization indicates that the distribution of chromium oxide on supports and surface chromium species structure are influenced by the nature of supports. The acidity/basicity and redox property of catalysts determines the catalytic activity in the dehydrogenation of ethane by carbon dioxide.
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