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Promoted NOₓ adsorption under wet conditions: Mechanistic insights into Pd redispersion in hydrothermally aged Pd/CHA

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-09-03 DOI:10.1016/j.apcata.2025.120539

Takeshi Ohtsu , Nao Tsunoji , Akira Oda , Atsushi Satsuma

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引用次数: 0

Abstract

Passive NO_x adsorbers (PNA) have been developed to adsorb NO_x from low-temperature (less than 200°C) diesel exhaust streams containing water vapor. When H₂O is present during NO_x adsorption, H₂O adsorbs on PNA, and this inhibits NO_x adsorption. However, this study shows H₂O-assisted NO_x adsorption on Pd/CHA. This phenomenon was observed in Pd/CHA that had been hydrothermally aged at 600℃ and 750℃. Also, the H₂O-assisted mechanism results from the co-adsorption of NO and H₂O under wet conditions. In situ FT-IR spectroscopy and FT-EXAFS analysis reveal that hydration of Pd cations enhances NO_x adsorption under wet conditions and induces redispersion of Pd cations from PdO_x. This phenomenon increases the number of Pd cations, which are NO_x adsorption sites, thereby increasing NO_x adsorption. These findings establish a new design of PNA catalysts applicable to H₂O-rich exhaust gases.

查看原文本刊更多论文

湿条件下促进NOₓ吸附：水热老化Pd/CHA中Pd再分散的机理

被动氮氧化物吸附剂（PNA）已被开发用于从含有水蒸气的低温（低于200°C）柴油排气流中吸附氮氧化物。当在NOx吸附过程中存在H2O时，H2O吸附在PNA上，这抑制了NOx的吸附。然而，本研究表明，Pd/CHA对NOx的吸附是由h2o辅助的。在600℃和750℃进行水热时效的Pd/CHA中观察到这种现象。同时，湿态条件下NO和H2O的共同吸附也产生了H2O辅助机理。原位FT-IR光谱和FT-EXAFS分析表明，Pd阳离子的水化增强了湿条件下对NOx的吸附，并诱导Pd阳离子从PdOx中再分散。这种现象增加了作为NOx吸附位点的Pd阳离子的数量，从而增加了NOx的吸附。这些发现建立了一种适用于富氢废气的新型PNA催化剂设计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Catalysis A: General

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.

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