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KMID : 1059519880320010022
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Journal of the Korean Chemical Society
1988 Volume.32 No. 1 p.22 ~ p.29
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Decomposition of Methanol-Water on MⅡ/ Cu / ZnO system
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Lee Young-Sook
Han Chong-Soo
Cho Min-Soo
Lee Kye-Soo
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Abstract
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The reaction of methanol-water mixture to CO2 and H2 on alkaline earth metal-copper-zinc oxide has been studied in the temperature range of 150 ∼ 300℃. Generally the addition of the alkaline earth metal to Cu/ZnO resulted in an enhancement of selectivity for CO2 formation and a reduction of catalytic activity. Measurable activities were found from 150℃, 200℃, and 250℃ on Mg/Cu/ZnO, Ca/Cu/ZnO, and Ba/Cu/ZnO respectively. However, the highest selectivity for CO2 formation was observed in Ba/Cu/ZnO catalyst at 250℃. The effect of alkaline earth metal or ZnO on the reactivity was investigated using temperature programmed desorption of CO2 or temperature programmed reduction with H2 over catalysts respectively. It was found that CO2 interacts more strongly in the sequence of MgO < CaO < BaO and ZnO decereases the reduction temperature of CuO. From the results, it was suggested that ZnO activates H2 in the redox process of Cu component and alkaline earth metals adsorbs CO2 in the catalytic process.
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