Excellent Catalytic Activity of a Pd‐Promoted MnOx Catalyst for Purifying Automotive Exhaust Gases,ChemCatChem

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Excellent Catalytic Activity of a Pd‐Promoted MnOx Catalyst for Purifying Automotive Exhaust Gases
ChemCatChem ( IF 3.8 ) Pub Date : 2020-05-24 , DOI: 10.1002/cctc.201902385
Saburo Hosokawa _{1,

2} , Takuya Shibano ₂ , Hiroaki Koga ₁ , Masafuyu Matsui ₁ , Hiroyuki Asakura _{1,

2} , Kentaro Teramura _{1,

2} , Mitsutaka Okumura ₃ , Tsunehiro Tanaka _{1,

2}

Affiliation

Currently, there is a strong demand for new automotive catalysts with improved low‐temperature activity and reduced precious metal use. Such catalysts must undergo simultaneous CO/hydrocarbon oxidations and NO reduction. A Pd catalyst supported on Mn‐modified hexagonal YbFeO₃ (Pd/Mn‐YFO) exhibited extremely high activity at low temperature via a Mars‐van Krevelen (MvK) mechanism involving lattice oxygen and oxygen vacancy site in the catalyst support. NO reduction proceeded by high CO and C₃H₆ oxidation activity of Pd/Mn‐YFO, and the catalytic activity of 1.0 wt% Pd/Mn‐YFO was higher than that of 5.0 wt% Pd/Al₂O₃, despite the lower Pd loading. We clarified that the lattice oxygen in MnO_x, which existed on the surface of YFO, consumed by CO and C₃H₆ oxidation was recovered by NO to form N₂ via MvK‐type NO reduction, while the Pd species promoted NO adsorption and dissociation on MnO‐like species.

中文翻译：

Pd促进的MnOx催化剂具有优异的催化活性，可净化汽车尾气

当前，人们对具有改善的低温活性和减少的贵金属使用的新型汽车催化剂有强烈的需求。此类催化剂必须同时进行CO /烃氧化和NO还原。负载在Mn改性六角形YbFeO ₃（Pd / Mn-YFO）上的Pd催化剂在低温下通过Mars-van Krevelen（MvK）机理表现出极高的活性，该机理涉及晶格氧和催化剂载体中的氧空位。尽管Pd / Mn-YFO的高CO和C ₃ H ₆氧化活性导致NO还原，但尽管Pd / Mn-YFO的Pd / Mn-YFO的催化活性高于5.0 wt％的Pd / Al ₂ O ₃，但其催化活性却更高。降低钯含量。我们澄清了MnO _x中的晶格氧存在于YFO表面的，被CO和C ₃ H ₆氧化消耗的NO，通过MvK型NO还原而被NO回收形成N ₂，而Pd则促进了NO在MnO类物质上的吸附和解离。

更新日期：2020-05-24

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