O.S. Alekseev , T. Beutel , E.A. Paukshtis , Yu.A. Ryndin , V.A. Likholobov , H. Knözinger
{"title":"氧化铌促进的Rh/SiO2催化剂上CO的化学吸附和反应性的FTIR研究","authors":"O.S. Alekseev , T. Beutel , E.A. Paukshtis , Yu.A. Ryndin , V.A. Likholobov , H. Knözinger","doi":"10.1016/0304-5102(94)00072-7","DOIUrl":null,"url":null,"abstract":"<div><p>(Rh + Nb)/SiO<sub>2</sub> catalysts were obtained by anchoring of nanometer size Rh particles on surface low-valent Nb<sup><em>n</em> +</sup> ions. These materials exhibit the following specific features compared to Rh/SiO<sub>2</sub>: a low Rh surface coverage by chemisorbed hydrogen and carbon oxide; a high-frequency shift of linear CO absorption band and appearance of two absorption bands of a C- and O-bonded CO at 1704 and 1652 cm<sup>−1</sup>. On exposure to H<sub>2</sub>, the stability of surface carbonyls increases in the sequence: Rh-CO-Nb<sup><em>n</em> +</sup> < Rh-CO ≤ Rh<sub>2</sub>(CO) < Rh<sup>+</sup>(CO)<sub>2</sub>. The possible role of C- and O-bonded CO complexes in the conversion of syngas on supported rhodium catalysts promoted by transition element oxides is discussed.</p></div>","PeriodicalId":16567,"journal":{"name":"分子催化","volume":"92 2","pages":"Pages 217-233"},"PeriodicalIF":0.0000,"publicationDate":"1994-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0304-5102(94)00072-7","citationCount":"10","resultStr":"{\"title\":\"FTIR studies of CO chemisorption and reactivity on Rh/SiO2 catalysts promoted by niobium oxide\",\"authors\":\"O.S. Alekseev , T. Beutel , E.A. Paukshtis , Yu.A. Ryndin , V.A. Likholobov , H. Knözinger\",\"doi\":\"10.1016/0304-5102(94)00072-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>(Rh + Nb)/SiO<sub>2</sub> catalysts were obtained by anchoring of nanometer size Rh particles on surface low-valent Nb<sup><em>n</em> +</sup> ions. These materials exhibit the following specific features compared to Rh/SiO<sub>2</sub>: a low Rh surface coverage by chemisorbed hydrogen and carbon oxide; a high-frequency shift of linear CO absorption band and appearance of two absorption bands of a C- and O-bonded CO at 1704 and 1652 cm<sup>−1</sup>. On exposure to H<sub>2</sub>, the stability of surface carbonyls increases in the sequence: Rh-CO-Nb<sup><em>n</em> +</sup> < Rh-CO ≤ Rh<sub>2</sub>(CO) < Rh<sup>+</sup>(CO)<sub>2</sub>. The possible role of C- and O-bonded CO complexes in the conversion of syngas on supported rhodium catalysts promoted by transition element oxides is discussed.</p></div>\",\"PeriodicalId\":16567,\"journal\":{\"name\":\"分子催化\",\"volume\":\"92 2\",\"pages\":\"Pages 217-233\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1994-08-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0304-5102(94)00072-7\",\"citationCount\":\"10\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"分子催化\",\"FirstCategoryId\":\"1089\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0304510294000727\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"Chemical Engineering\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"分子催化","FirstCategoryId":"1089","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0304510294000727","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Chemical Engineering","Score":null,"Total":0}
FTIR studies of CO chemisorption and reactivity on Rh/SiO2 catalysts promoted by niobium oxide
(Rh + Nb)/SiO2 catalysts were obtained by anchoring of nanometer size Rh particles on surface low-valent Nbn + ions. These materials exhibit the following specific features compared to Rh/SiO2: a low Rh surface coverage by chemisorbed hydrogen and carbon oxide; a high-frequency shift of linear CO absorption band and appearance of two absorption bands of a C- and O-bonded CO at 1704 and 1652 cm−1. On exposure to H2, the stability of surface carbonyls increases in the sequence: Rh-CO-Nbn + < Rh-CO ≤ Rh2(CO) < Rh+(CO)2. The possible role of C- and O-bonded CO complexes in the conversion of syngas on supported rhodium catalysts promoted by transition element oxides is discussed.
期刊介绍：
Journal of Molecular Catalysis (China) is a bimonthly journal, founded in 1987. It is a bimonthly journal, founded in 1987, sponsored by Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, under the supervision of Chinese Academy of Sciences, and published by Science Publishing House, which is a scholarly journal openly circulated both at home and abroad. The journal mainly reports the latest progress and research results on molecular catalysis. It contains academic papers, research briefs, research reports and progress reviews. The content focuses on coordination catalysis, enzyme catalysis, light-ribbed catalysis, stereochemistry in catalysis, catalytic reaction mechanism and kinetics, the study of catalyst surface states and the application of quantum chemistry in catalysis. We also provide contributions on the activation, deactivation and regeneration of homogeneous catalysts, solidified homogeneous catalysts and solidified enzyme catalysts in industrial catalytic processes, as well as on the optimisation and characterisation of catalysts for new catalytic processes.
The main target readers are scientists and postgraduates working in catalysis in research institutes, industrial and mining enterprises, as well as teachers and students of chemistry and chemical engineering departments in colleges and universities. Contributions from related professionals are welcome.
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