Díaz-Verde Álvaro, Dos Santos Veiga Emerson Luiz, Beltrán-Mir Héctor, Illán-Gómez María José, Cordoncillo-Cordoncillo Eloísa
Carbon Materials and Environment Research Group, Inorganic Chemistry Department, Institute of Materials Science (IUMA), University of Alicante, Ctra San Vicente del Raspeig s/n, San Vicente dek Raspeig, 03690 Alicante, Spain.
Department of Inorganic and Organic Chemistry, University Jaume I, Av. Vicent Sos Baynat s/n, 12071 Castellón de la Plana, Spain.
Nanomaterials (Basel). 2025 Jan 10;15(2):103. doi: 10.3390/nano15020103.
In this work, a series of BaMnCuO samples (x: 1, 0.9, 0.8, and 0.7, BxMC) was synthesized, characterized, and used as catalysts for CO oxidation reaction. All formulations were active for CO oxidation in the tested conditions. A correlation between the electrical conductivity, obtained by impedance spectroscopy, and the reducibility of the samples, obtained by H-TPR, was observed. The BaMnCuO composition (B0.8MC) showed the best catalytic performance (comparable to that of the 1% Pt/AlO reference sample) during tests conducted under conditions similar to those found in the exhaust gases of current gasoline engines. The characterization data suggest the simultaneous presence of a high Mn(IV)/Mn(III) surface ratio, oxygen vacancies, and reduced copper species, these two latter being key properties for ensuring a high CO conversion percentage as both are active sites for CO oxidation. The reaction temperature and the reactant atmosphere composition seem to be the most important factors for achieving a good catalytic performance, as they strongly determine the location and stability of the reduced copper species.
在本工作中，合成了一系列BaMnCuO样品（x：1、0.9、0.8和0.7，即BxMC），对其进行了表征，并用作CO氧化反应的催化剂。所有配方在测试条件下对CO氧化均具有活性。观察到通过阻抗谱获得的电导率与通过H-TPR获得的样品的还原性之间存在相关性。在与当前汽油发动机废气中发现的条件相似的测试条件下，BaMnCuO组合物（B0.8MC）表现出最佳的催化性能（与1%Pt/AlO参考样品相当）。表征数据表明，同时存在高的Mn(IV)/Mn(III)表面比率、氧空位和还原态铜物种，后两者是确保高CO转化率的关键特性，因为它们都是CO氧化的活性位点。反应温度和反应物气氛组成似乎是实现良好催化性能的最重要因素，因为它们强烈地决定了还原态铜物种的位置和稳定性。
