Design of platinum group metal-free automotive three-way catalyst: MgMn2O4 and CuCo2O4 in tandem layout

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-04-21 DOI:10.1016/j.apcata.2025.120305

Keisuke Maruichi , Taichi Yamaguchi , Ryosuke Sakai , Kakuya Ueda , Akira Oda , Atsushi Satsuma

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Abstract

Platinum group metal (PGM)-free and Cr-free automotive three-way catalyst (TWC) was examined using two types of base-metal oxides for hydrocarbon preferential oxidation (HC-PROX) and NO reduction by CO in tandem configuration. MnOx-based binary mixed metal oxides (X1Mn2, X = Ba, Ca, Co, Cu, Fe, Mg, Ni, Zn, Zr) were investigated for the design of HC-PROX catalysts. Mg1Mn2 achieved both high propene oxidation activity and low CO oxidation activity, and the catalyst phase was determined as MgMn₂O₄ having the spinel structure. A tandem TWC composed of MgMn₂O₄ for HC-PROX and CuCo₂O₄ for NO-CO reaction showed comparable NO reduction activity and higher oxidation activity of propene and CO compared to Rh/ZrO₂ as a benchmark. In-situ FTIR study clarified that the suppression of CO oxidation over MgMn₂O₄ is caused by strongly adsorbed acetate and formate on the catalyst surface.

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MgMn2O4和CuCo2O4串联布局无铂族金属汽车三元催化剂的设计

使用两种类型的贱金属氧化物串联配置，研究了无铂族金属 (PGM) 和无铬的汽车三元催化剂 (TWC)，用于碳氢化合物优先氧化 (HC-PROX) 和一氧化碳还原氮氧化物。为设计 HC-PROX 催化剂，研究了基于氧化锰的二元混合金属氧化物（X1Mn2，X = Ba、Ca、Co、Cu、Fe、Mg、Ni、Zn、Zr）。Mg1Mn2 同时具有较高的丙烯氧化活性和较低的 CO 氧化活性，催化剂相被确定为具有尖晶石结构的 MgMn2O4。与作为基准的 Rh/ZrO2 相比，用于 HC-PROX 反应的 MgMn2O4 和用于 NO-CO 反应的 CuCo2O4 组成的串联 TWC 表现出相当的 NO 还原活性和更高的丙烯和 CO 氧化活性。原位傅立叶变换红外研究表明，MgMn2O4 抑制 CO 氧化的原因是催化剂表面强烈吸附了醋酸盐和甲酸盐。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.