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KMID : 1059519930370020183
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Journal of the Korean Chemical Society
1993 Volume.37 No. 2 p.183 ~ p.190
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A Study of Carbon Monoxide Oxidation on ZnO Single Crystal Surface
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Jun Jin
Han Chong-Soo
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Abstract
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The properties of oxidation reactions of carbon monoxide on ZnO (1010) were studied at the temperature range of 298∼573 K by measuring the capacitance and conductance in the insulating layer of two contacting crystal faces which vary with ZnO-gas interaction mechanisms. Exposure of the sample to CO resulted in an increase in the layer depth at 298∼373 K, while it decreased above 473 K. But the variation of the layer depth was very small in all measurements. When CO was admitted to the sample previously treated with O2 at the same temperature, we observed the different features compared with the case of CO adsorption. From these results we discussed the mechanisms of CO oxidation in connection with the adsorbed oxygen species at each temperature.
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KEYWORD
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