Photodeposited palladium on nanocrystalline CeZrO_4-δ support was evaluated for CO oxidation, as a function of particle size and pre-treatment. All the catalysts were well characterized by XRD, SEM, EDX, TEM, CO chemisorption and Raman spectroscopy. It was observed that change in photodeposition time alters the average crystallite size of Pd, and the same was confirmed by CO chemisorption. 7 nm average crystallite size of Pd exhibited excellent catalytic activity for CO oxidation. In order to understand the effect of support and metal-support interaction, 1 wt% Pd was deposited deliberately onto reduced and oxidized CeZrO_4-δ support. The reduced support with anionic vacancies and more Ce³⁺ species exhibited an improvement in CO oxidation at onset temperature. Detailed analysis shows that Pd-deposition occurs preferentially at oxygen-vacancy sites and subsequent metal-support interaction influences the catalysis.

对纳米晶CeZrO4 _-δ载体上的光沉积钯进行了CO氧化评估，该氧化与粒径和预处理有关。通过XRD，SEM，EDX，TEM，CO化学吸附和拉曼光谱对所有催化剂进行了很好的表征。观察到光沉积时间的变化改变了Pd的平均微晶尺寸，并且通过CO化学吸附也证实了这一点。Pd的平均微晶尺寸为7 nm，对CO氧化表现出出色的催化活性。为了理解载体和金属-载体相互作用的影响，故意将1 wt％的Pd沉积在还原和氧化的CeZrO4 _-δ载体上。阴离子空位和更多的Ce ³⁺减少了支持物种在起始温度下表现出CO氧化的改善。详细分析表明，Pd沉积优先发生在氧空位处，随后的金属与载体之间的相互作用会影响催化作用。