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Dehydrogenation of light alkanes over oxidized diamond-supported catalysts in the presence of carbon dioxide |
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| Authors: | Kiyoharu Nakagawa Chiaki Kajita Na-oki Ikenaga Mikka Nishitani-Gamo Toshihiro Ando and Toshimitsu Suzuki |
| Affiliation: | a Department of Chemical Engineering, Faculty of Engineering and High Technology Research Center, Kansai University, 3-3-35 Yamate, Suita, Osaka 564-8680, Japan b Japan Science and Technology Corporation (JST) and National Institute for Materials Science (NIMS), 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan c Department of Applied Chemistry, Faculty of Engineering, Toyo University, 2100, Kujirai, Kawagoe, Saitama 350-8585, Japan d Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology Corporation (JST) and National Institute for Materials Science (NIMS), 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan |
| Abstract: | Oxidized diamond demonstrated excellent support for the dehydrogenation of light alkanes to alkenes in the presence of CO2. Oxidized diamond-supported Cr2O3 and V2O5 catalysts exhibited comparatively higher catalytic activities in the dehydrogenation of lower alkanes in the presence of CO2. In the dehydrogenation of propane, the oxidized diamond-supported Cr2O3 and V2O5 catalysts in the presence of CO2 afforded nearly twofold higher activities than that in the absence of CO2. The activity of the oxidized diamond-supported V2O5 catalyst in the dehydrogenation of propane increased with increasing reaction temperatures. Furthermore, in the dehydrogenation of n-butane and iso-butane, a promoting effect of CO2 on butane conversion and butenes yields was observed over the oxidized diamond-supported Cr2O3 and V2O5 catalysts, though the promotion effect was small. UV-Vis analyses of the fresh and the reacted catalysts in the presence and absence of CO2 revealed that CO2 kept the surface V2O5 and Cr2O3 in a state of oxidation slightly higher than that in the absence of CO2. |
| Keywords: | Diamond Carbon dioxide Propane Propylene Dehydrogenation Chromium oxide Vanadium oxide |
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