パラジウム上のCO酸化における律速過程の切り替えと脱離ダイナミクスの変化

抄録

The working site providing oxygen ad-atoms reactive towards CO was examined on Pd (110) and Pd (100) from the angular and velocity distributions of desorbing CO₂. The distributions were measured with cross correlation time-of-flight techniques. On Pd (110), abrupt changes were found in both the distributions around a critical CO pressure where the rate-limiting step switched over, indicating that CO₂ formation sites shifted to O₂ dissociation places. On the other hands, no changes were observed on Pd (100), suggesting no shift of CO₂ sites with oxygen coverage.