The effect of an electric field on the ggr;hyphen;rayhyphen;induced reaction of CO formation from CO2and graphite was investigated. The experiment was carried out at room temperature under an exposure dose rate of 1.5times;105R/h using diodelike tubes with graphite and metal (tungsten or molybdenum) electrodes filled with CO2gas at 300 mm Hg. When a negative voltage was applied to the graphite to obtain a saturation current, the yield of CO was about 2.5 times as much as that in the absence of any field. However, on application of a positive field, the yield was not significantly different than the zero field case. TheGvalue for CO formation was found to be 0.62sim;1.01 in the absence of the field.The ionic reaction mechanismsCO2plus;plus;Cminus;lpar;graphite electroderpar;rarr;2COand/orCO2plus;plus;Cminus;lpar;graphite electroderpar;rarr;Clpar;graphiterpar;Oplus;COare proposed for the increased yield of CO in the case of negative voltage application to the graphite.
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