{"title":"Effect of Ageing Atmosphere on Three-way Catalytic Performance of Supported Rh Catalysts","authors":"Yasutaka Tomida, M. Haneda","doi":"10.1627/JPI.64.219","DOIUrl":null,"url":null,"abstract":"Deactivation of a mixture of Rh/Al 2 O 3 and CeO 2 _ ZrO 2 (CZ) by high-temperature ageing was clearly observed in three-way catalytic reactions under lean/rich perturbation conditions. The light-off temperature at which 50 % conversion was achieved was increased in the order of fresh ＜ stoichi. ≈ rich ＜ rich/lean ＜ lean ageing conditions. Rh dispersion and presence of isolated Rh sites, revealed from in-situ FT-IR spectroscopy following CO adsorption, were responsible for the high light-off activity. NO conversion in higher temperature regions under lean/rich perturbation conditions was influenced by the ageing atmosphere. H 2 -TPR measurements suggested the formation of Rh _ CZ interactions with different strengths depending on the atmosphere during high-tempera-ture ageing. The strength of the Rh _ CZ interaction was suspected to be important to achieve high NO conversion in higher temperature regions.","PeriodicalId":17362,"journal":{"name":"Journal of The Japan Petroleum Institute","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of The Japan Petroleum Institute","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1627/JPI.64.219","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
Deactivation of a mixture of Rh/Al 2 O 3 and CeO 2 _ ZrO 2 (CZ) by high-temperature ageing was clearly observed in three-way catalytic reactions under lean/rich perturbation conditions. The light-off temperature at which 50 % conversion was achieved was increased in the order of fresh ＜ stoichi. ≈ rich ＜ rich/lean ＜ lean ageing conditions. Rh dispersion and presence of isolated Rh sites, revealed from in-situ FT-IR spectroscopy following CO adsorption, were responsible for the high light-off activity. NO conversion in higher temperature regions under lean/rich perturbation conditions was influenced by the ageing atmosphere. H 2 -TPR measurements suggested the formation of Rh _ CZ interactions with different strengths depending on the atmosphere during high-tempera-ture ageing. The strength of the Rh _ CZ interaction was suspected to be important to achieve high NO conversion in higher temperature regions.
期刊介绍：
“Journal of the Japan Petroleum Institute”publishes articles on petroleum exploration, petroleum
refining, petrochemicals and relevant subjects (such as natural gas, coal and so on). Papers published in this journal are
also put out as the electronic journal editions on the web.
Topics may range from fundamentals to applications. The latter may deal with a variety of subjects, such as: case studies in the development of oil fields, design and operational data of industrial processes, performances of commercial products and others
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