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.
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