Physicochemical Properties and NH3-SCR Performance of Supported CeO2–MnOx Mixed Oxides Catalysts

IF 0.6 4区化学 Q4 CHEMISTRY, APPLIED Russian Journal of Applied Chemistry Pub Date : 2024-06-28 DOI:10.1134/s1070427224020034

Seyed Mahdi Mousavi, Parvaneh Nakhostin Panahi, Aligholi Niaei

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Abstract

CeO₂–MnO_x mixed oxides supported on different carriers (ZSM-5, TiO₂, and SAPO-34) were prepared by the sol-gel combustion method and evaluated for the selective catalytic reduction of NO with NH₃. The physicochemical properties of the samples were determined by using XRD, TEM, N₂ adsorption (BET method), H₂-TPR, and NH₃-TPD. The Ce–Mn/TiO₂ exhibited a higher NO conversion than Ce–Mn/ZSM-5 in the 100-200°C temperature range, but the NO conversion of Ce–Mn/ZSM-5 increases with reaction temperature (being the N₂ selectivity close to 100%) whereas, for Ce–Mn/TiO₂, the N₂ selectivity extremely decreases. The reducibility and surface acidity of samples seems to explain the catalytic performance. Thus, although the reducibility of Ce–Mn/ZSM-5 and Ce–Mn/TiO₂ was similar, the large number of surface acid sites of Ce–Mn/ZSM-5 could be a plausible reason for its excellent SCR activity. In fact, the superior SCR activity of Ce–Mn/ZSM-5 (94% NO conversion and 95% N₂ selectivity at 300°C) is related to the presence of well-dispersed Ce–Mn mixed oxide nanoparticles, high reducibility, and a large number of surface acid sites.

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支撑型 CeO2-MnOx 混合氧化物催化剂的理化性质和 NH3-SCR 性能

摘要采用溶胶-凝胶燃烧法制备了支撑在不同载体（ZSM-5、TiO2 和 SAPO-34）上的 CeO2-MnOx 混合氧化物，并评估了其对 NO 与 NH3 的选择性催化还原作用。采用 XRD、TEM、N2 吸附（BET 法）、H2-TPR 和 NH3-TPD 测定了样品的理化性质。在 100-200°C 的温度范围内，Ce-Mn/TiO2 的氮氧化物转化率高于 Ce-Mn/ZSM-5，但 Ce-Mn/ZSM-5 的氮氧化物转化率随反应温度的升高而升高（即 N2 选择性接近 100%），而 Ce-Mn/TiO2 的 N2 选择性则极度降低。样品的还原性和表面酸度似乎可以解释催化性能。因此，虽然 Ce-Mn/ZSM-5 和 Ce-Mn/TiO2 的还原性相似，但 Ce-Mn/ZSM-5 具有大量的表面酸性位点，这可能是其具有出色的 SCR 活性的一个合理原因。事实上，Ce-Mn/ZSM-5 的优异 SCR 活性（300°C 时 94% 的 NO 转化率和 95% 的 N2 选择性）与分散良好的 Ce-Mn 混合氧化物纳米颗粒、高还原性和大量表面酸位点的存在有关。

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来源期刊

Russian Journal of Applied Chemistry 化学-应用化学

CiteScore

1.60

自引率

11.10%

发文量

审稿时长

2-4 weeks

期刊介绍： Russian Journal of Applied Chemistry (Zhurnal prikladnoi khimii) was founded in 1928. It covers all application problems of modern chemistry, including the structure of inorganic and organic compounds, kinetics and mechanisms of chemical reactions, problems of chemical processes and apparatus, borderline problems of chemistry, and applied research.