L. S. Kibis, A. V. Zadesenets, T. Yu. Kardash, S. V. Korenev, O. A. Stonkus, E. M. Slavinskaya, O. Yu. Podyacheva, A. I. Boronin
{"title":"Rh-CeO2/MWCNT 复合催化剂的结构和催化特性","authors":"L. S. Kibis, A. V. Zadesenets, T. Yu. Kardash, S. V. Korenev, O. A. Stonkus, E. M. Slavinskaya, O. Yu. Podyacheva, A. I. Boronin","doi":"10.1134/S0022476624030077","DOIUrl":null,"url":null,"abstract":"<p>Composite catalysts consisting of Rh–CeO<sub><i>x</i></sub> structures supported on the surface of multi-walled carbon nanotubes (MWCNTs) are studied. For supported active components (Rh, Ce) the rhodium content is maintained constant on the MWCNT surface and the cerium concentration is varied in the range Rh<sub>at</sub>/Ce<sub>at</sub> = 0.085-0.34. The obtained samples are investigated by a combination of structural (X-ray diffraction, transmission electron microscopy (TEM)), spectral (X-ray photoelectron spectroscopy (XPS)), and kinetic (temperature-programmed reaction with CO (TPR-CO) and CO+O<sub>2</sub> (TPR-CO+O<sub>2</sub>)) techniques. Highly dispersed CeO<sub>2</sub> and RhO<sub><i>x</i></sub> particles are found to form in all samples studied. When the Rh<sub>at</sub>/Ce<sub>at</sub> ratio is changed, structures are formed that exhibit the catalytic activity in the CO oxidation reaction for different temperature ranges. At low Rh<sub>at</sub>/Ce<sub>at</sub> ratios (< 0.17) the CO conversion is observed at temperatures above 100 °C. When the Rh<sub>at</sub>/Ce<sub>at</sub> ratio increases, centers exhibiting the catalytic activity at temperatures below 0 °C are formed in Rh–CeO<sub>2</sub>/MWCNT catalysts. HR-TEM and TPR-CO studies of composite catalysts with a high Rh<sub>at</sub>/Ce<sub>at</sub> ratio reveal that structures based on dispersed oxidized rhodium particles modified by Ce<sup>3+</sup> ions can be active species.</p>","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Structural and Catalytic Properties of Rh–CeO2/MWCNT Composite Catalysts\",\"authors\":\"L. S. Kibis, A. V. Zadesenets, T. Yu. Kardash, S. V. Korenev, O. A. Stonkus, E. M. Slavinskaya, O. Yu. Podyacheva, A. I. Boronin\",\"doi\":\"10.1134/S0022476624030077\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Composite catalysts consisting of Rh–CeO<sub><i>x</i></sub> structures supported on the surface of multi-walled carbon nanotubes (MWCNTs) are studied. For supported active components (Rh, Ce) the rhodium content is maintained constant on the MWCNT surface and the cerium concentration is varied in the range Rh<sub>at</sub>/Ce<sub>at</sub> = 0.085-0.34. The obtained samples are investigated by a combination of structural (X-ray diffraction, transmission electron microscopy (TEM)), spectral (X-ray photoelectron spectroscopy (XPS)), and kinetic (temperature-programmed reaction with CO (TPR-CO) and CO+O<sub>2</sub> (TPR-CO+O<sub>2</sub>)) techniques. Highly dispersed CeO<sub>2</sub> and RhO<sub><i>x</i></sub> particles are found to form in all samples studied. When the Rh<sub>at</sub>/Ce<sub>at</sub> ratio is changed, structures are formed that exhibit the catalytic activity in the CO oxidation reaction for different temperature ranges. At low Rh<sub>at</sub>/Ce<sub>at</sub> ratios (< 0.17) the CO conversion is observed at temperatures above 100 °C. When the Rh<sub>at</sub>/Ce<sub>at</sub> ratio increases, centers exhibiting the catalytic activity at temperatures below 0 °C are formed in Rh–CeO<sub>2</sub>/MWCNT catalysts. HR-TEM and TPR-CO studies of composite catalysts with a high Rh<sub>at</sub>/Ce<sub>at</sub> ratio reveal that structures based on dispersed oxidized rhodium particles modified by Ce<sup>3+</sup> ions can be active species.</p>\",\"PeriodicalId\":1,\"journal\":{\"name\":\"Accounts of Chemical Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":16.4000,\"publicationDate\":\"2024-04-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Accounts of Chemical Research\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S0022476624030077\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1134/S0022476624030077","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Structural and Catalytic Properties of Rh–CeO2/MWCNT Composite Catalysts
Composite catalysts consisting of Rh–CeOx structures supported on the surface of multi-walled carbon nanotubes (MWCNTs) are studied. For supported active components (Rh, Ce) the rhodium content is maintained constant on the MWCNT surface and the cerium concentration is varied in the range Rhat/Ceat = 0.085-0.34. The obtained samples are investigated by a combination of structural (X-ray diffraction, transmission electron microscopy (TEM)), spectral (X-ray photoelectron spectroscopy (XPS)), and kinetic (temperature-programmed reaction with CO (TPR-CO) and CO+O2 (TPR-CO+O2)) techniques. Highly dispersed CeO2 and RhOx particles are found to form in all samples studied. When the Rhat/Ceat ratio is changed, structures are formed that exhibit the catalytic activity in the CO oxidation reaction for different temperature ranges. At low Rhat/Ceat ratios (< 0.17) the CO conversion is observed at temperatures above 100 °C. When the Rhat/Ceat ratio increases, centers exhibiting the catalytic activity at temperatures below 0 °C are formed in Rh–CeO2/MWCNT catalysts. HR-TEM and TPR-CO studies of composite catalysts with a high Rhat/Ceat ratio reveal that structures based on dispersed oxidized rhodium particles modified by Ce3+ ions can be active species.
期刊介绍：
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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