Roles of NOx and the supported RuO2 in accelerating soot oxidation over RuO2/CeO2–ZrO2

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-01-28 DOI:10.1016/j.apcata.2025.120144

Hitoshi Kubo , Yusuke Ohshima , Shunsuke Kato , Noriyuki Saitoh , Noriko Yoshizawa , Osamu Nakagoe , Shuji Tanabe

{"title":"Roles of NOx and the supported RuO2 in accelerating soot oxidation over RuO2/CeO2–ZrO2","authors":"Hitoshi Kubo , Yusuke Ohshima , Shunsuke Kato , Noriyuki Saitoh , Noriko Yoshizawa , Osamu Nakagoe , Shuji Tanabe","doi":"10.1016/j.apcata.2025.120144","DOIUrl":null,"url":null,"abstract":"<div><div>RuO2/CeO2–ZrO2 (Ru/CZ) shows high activity for soot oxidation in a NO2/O2 flow. The soot oxidation occurred at the soot-Ru/CZ interface and at the soot surface. It was shown that RuO2 increases the Ce3 +/Ce in CZ surface, and that dissociates the adsorbed O2 and supplies O atoms to CZ support. Adsorbed-NO3 (ad-NO3) contributed more than gaseous NO2 to soot oxidation. The investigation of activation energy and outlet NOx gas suggested that ad-NO3 ignited soot, and then CZ lattice oxygen and reactive oxygen species derived from CZ support mainly oxidized soot. Although the molar ratio of ad-NO3/soot was only 1 %, ad-NO3 accelerated soot oxidation. This was implied to be because ad-NO3 oxidizes soot through the redox cycle between ad-NO2 and ad-NO3 by CZ lattice oxygen. Soot oxidation over Ru/CZ is believed to be accelerated by the synergistic effect of the O2 dissociation by RuO2 and the ignition of soot by ad-NO3.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"693 ","pages":"Article 120144"},"PeriodicalIF":4.7000,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Catalysis A: General","FirstCategoryId":"1","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0926860X25000456","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

RuO₂/CeO₂–ZrO₂ (Ru/CZ) shows high activity for soot oxidation in a NO₂/O₂ flow. The soot oxidation occurred at the soot-Ru/CZ interface and at the soot surface. It was shown that RuO₂ increases the Ce^3 +/Ce in CZ surface, and that dissociates the adsorbed O₂ and supplies O atoms to CZ support. Adsorbed-NO₃ (ad-NO₃) contributed more than gaseous NO₂ to soot oxidation. The investigation of activation energy and outlet NO_x gas suggested that ad-NO₃ ignited soot, and then CZ lattice oxygen and reactive oxygen species derived from CZ support mainly oxidized soot. Although the molar ratio of ad-NO₃/soot was only 1 %, ad-NO₃ accelerated soot oxidation. This was implied to be because ad-NO₃ oxidizes soot through the redox cycle between ad-NO₂ and ad-NO₃ by CZ lattice oxygen. Soot oxidation over Ru/CZ is believed to be accelerated by the synergistic effect of the O₂ dissociation by RuO₂ and the ignition of soot by ad-NO₃.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

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.