Pt has been economically favored over Rh and Pd. However, Pt-based three-way catalysts (TWCs) have been studied less than Pd- and Rh-based TWCs; therefore, their properties have not yet been sufficiently evaluated, especially under conditions relevant to modern three-way catalysis operation, wherein deviations from stoichiometric conditions are often encountered. In this study, we examined the promotional effect of basic metal additives in Pt/M/Al₂O₃ (M = Ba, La, Sr) on the efficiency of three-way catalytic reactions. The catalytic activities of the Pt/M/Al₂O₃ catalysts for NO, CO, and total hydrocarbons were superior to those of Pt/Al₂O₃; moreover, Ba enhanced the catalytic activity of Pt-based catalysts more efficiently than La and Sr. The best-performing catalyst, Pt/Ba/Al₂O₃, was subjected to kinetic studies and various in situ/operando spectroscopic experiments, namely, X-ray absorption spectroscopy, infrared spectroscopy, and ambient-pressure X-ray photoelectron spectroscopy (AP-XPS), to investigate the role of Ba in the NO reduction reaction. The Pt⁰ species loaded on Ba/Al₂O₃ were more electron-rich than those loaded on Al₂O₃, thereby promoting NO dissociation into N and O atoms, as revealed by the AP-XPS results. Moreover, the efficient formation of intermediate surface NO_x species, including nitrites and nitrates, and their reactivities toward reductant gases, such as H₂ or CO, were critical for promoting the effect of Ba on the NO reduction reaction.

Pt 在经济上比 Rh 和 Pd 更受青睐。然而，Pt 基三元催化剂 (TWCs) 的研究少于 Pd 和 Rh 基 TWCs；因此，它们的性质尚未得到充分评估，特别是在与现代三元催化操作相关的条件下，其中经常遇到与化学计量条件的偏差。在本研究中，我们研究了 Pt/M/Al ₂ O ₃ (M = Ba, La, Sr) 中碱性金属添加剂对三元催化反应效率的促进作用。Pt/M/Al ₂ O ₃催化剂对NO、CO和总烃的催化活性优于Pt/Al ₂ O ₃; 此外，Ba 比 La 和 Sr 更有效地增强了 Pt 基催化剂的催化活性。性能最佳的催化剂 Pt/Ba/Al ₂ O ₃进行了动力学研究和各种原位/操作光谱实验，即， X 射线吸收光谱、红外光谱和环境压力 X 射线光电子能谱 (AP-XPS)，以研究 Ba 在 NO 还原反应中的作用。负载在 Ba/Al ₂ O ₃上的 Pt ^{0比负载在 Al} ₂ O ₃上的更富电子，从而促进 NO 解离为 N 和 O 原子，如 AP-XPS 结果所示。此外，中间表面NO _x物质（包括亚硝酸盐和硝酸盐）的有效形成及其对还原剂气体（如H ₂或CO）的反应性对于促进Ba对NO还原反应的影响至关重要。