In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts |
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| Authors: | Chen-Bin Wang Chih-Wei Tang Hsin-Chi Tsai Ming-Chih Kuo Shu-Hua Chien |
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| Affiliation: | (1) Department of Applied Chemistry, Chung Cheng Institute of Technology, National Defense University, Tahsi, Taoyuan, Taiwan, 33509, Republic of China;(2) Institute of Chemistry, Academia Sinica, Taipei, Taiwan, 11529, Republic of China;(3) Department of Chemistry, National Taiwan University, Taipei, Taiwan, 10764, Republic of China |
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| Abstract: | Three types of supported cobalt catalysts (5% as metal Co loading on SiO2, Al2O3 and TiO2) were prepared by incipient wetness impregnation with aqueous Co(NO3)2·6H2O solution. Then, all catalysts were calcined in air at 400 °C (assigned as 5Co/Si C400, 5Co/Al C400 and 5Co/Ti C400). Their
catalytic activities towards the CO oxidation were studied in a continuous flow micro-reactor. Adsorption of carbon monoxide
(CO) and the co-adsorption of CO/O2 over cobalt oxide were further tested under in situ FT-IR. The results showed that both 5Co/Si C400 and 5Co/Al C400 had higher activity than 5Co/Ti C400. The T50 (50% conversion) for both 5Co/Si C400 and 5Co/Al C400 was reached at temperatures as low as ambient temperature. According
to the in situ FT-IR analysis, the variation in oxidation of CO was interpreted with different mechanisms, i.e., the reaction between adsorbed
CO and lattice oxygen of cobalt oxide, and part of CO2 formation via carbonates on 5Co/Si C400; both types of carbonates are formed on 5Co/Al C400 to promote the CO oxidation;
while both strong adsorption of CO on TiO2 and CO2 on cobalt oxide for 5Co/Ti C400 leads to affect the activity. |
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| Keywords: | cobalt oxide FT-IR CO oxidation adsorption |
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