The Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry Ministry of Education, Shaanxi University of Science and Technology, Xi'an, People's Republic of China.
Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application, Chenzhou, People's Republic of China.
Environ Technol. 2024 Jan;45(2):306-314. doi: 10.1080/09593330.2022.2109994. Epub 2022 Aug 18.
A series of La-Ce-MnOx catalysts derived from the precipitation of acetate salt and ammonium carbonate were calcined at different temperatures and applied for the catalytic oxidation of soot from diesel exhausts. The structure states of the as-prepared catalysts and catalytic behaviour for soot oxidation were studied by many characterization techniques such as XRD, XANES, N adsorption-desorption, TPR, O-TPD, XPS and TGA. XANES results display most Mn species are Mn when the samples are calcined at 500 and 600°C. However, for MCLa-700 and MCLa-800 catalysts, the predominance valence is 3+ ions. The MCLa-500 and MCLa-600 catalysts possess higher concentrations of surface active oxygen evidenced by H-TPR and soot-TPR. Therefore, the combustion rate of soot over MCLa-600 catalyst is remarkably increased with the T, T and T at 318°C, 360°C and 388°C under NOx atmosphere respectively.
一系列 La-Ce-MnOx 催化剂是通过醋酸盐和碳酸铵的共沉淀制备的，并在不同温度下煅烧，用于催化氧化柴油机尾气中的烟尘。采用 XRD、XANES、N 吸附-脱附、TPR、O-TPD、XPS 和 TGA 等多种表征技术研究了催化剂的结构状态和催化氧化烟尘的性能。XANES 结果表明，当样品在 500 和 600°C 下煅烧时，大多数 Mn 物种为 Mn。然而，对于 MCLa-700 和 MCLa-800 催化剂，优势价态是 3+离子。MCLa-500 和 MCLa-600 催化剂具有更高浓度的表面活性氧，这一点可以通过 H-TPR 和烟尘 TPR 得到证明。因此，在 NOx 气氛下，MCLa-600 催化剂的烟尘燃烧速率在 318°C、360°C 和 388°C 时分别显著提高，T、T 和 T 分别为 318°C、360°C 和 388°C。
