Although Pt/CoO is an active catalyst for CO oxidation, its low thermal stability may impede its application. The thermal stability and catalytic performance of Pt/CoO were considerably enhanced by FeO doping. FeO doping stabilized the mesostructured material during the high-temperature treatment, and the FeO-doped samples retained a larger specific surface area. The characterization results revealed that FeO doping inhibited catalyst crystallization and decomposition and the growth of catalyst grains during high-temperature calcination. The FeO doping reduced the Co-O bond strength in the surface CoO lattice, increased the Co ratio, and generated highly active surface oxygen species. FeO doping also facilitates CO desorption, which improves CO adsorption and oxidation. SO and NO impede CO oxidation on Pt/FeO/CoO. This negative impact was caused by the inert species formed when SO or NO reacted with O on the catalyst, such as SO, HSO, or nitrate species, which covered the active sites.

中文翻译：

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Fe2O3 掺杂对 Pt/Co3O4 催化剂 CO 氧化的影响：热稳定性和催化活性的提高


尽管Pt/CoO是CO氧化的活性催化剂，但其较低的热稳定性可能阻碍其应用。 FeO 掺杂显着增强了 Pt/CoO 的热稳定性和催化性能。 FeO掺杂使介观结构材料在高温处理过程中保持稳定，并且FeO掺杂样品保留了更大的比表面积。表征结果表明，FeO掺杂抑制了高温煅烧过程中催化剂的结晶分解和催化剂晶粒的生长。 FeO掺杂降低了表面CoO晶格中的Co-O键强度，提高了Co比，并产生了高活性的表面氧物种。 FeO 掺杂还促进 CO 解吸，从而改善 CO 吸附和氧化。 SO 和 NO 阻碍 Pt/FeO/CoO 上的 CO 氧化。这种负面影响是由 SO 或 NO 与催化剂上的 O 反应时形成的惰性物质（例如 SO、HSO 或硝酸盐物质）引起的，这些惰性物质覆盖了活性位点。