Propylene Metathesis Catalysts Prepared by Interaction of Re2(CO)10 with γ-Al2O3 Научная публикация
| Журнал |
Journal of Molecular Catalysis (Continued after 1994 as Journal of Molecular Catalysis A: Chemical and Journal of Molecular Catalysis B: Enzymatic)
ISSN: 0304-5102 |
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| Вых. Данные | Год: 1988, Том: 46, Номер: 1-3, Страницы: 209-228 Страниц : 20 DOI: 10.1016/0304-5102(88)85095-8 | ||
| Ключевые слова | Alumina; Catalysis; Oxygen; Propylene--Chemical Reactions; Solids--Structure | ||
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| Организации |
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Реферат:
In this work new data on the state of Re and on the nature of active sites in Re2(CO)10 derived catalysts are discussed. Active catalysts for propylene metathesis can be obtained by several treatments of Re2(CO)10/Al2O3:
(1)O2 treatment at 393 K of partially decarbonylated samples of Re2(CO)10/Al2O3. In this case, part of the oxygen reversibly binds to the catalyst, probably in molecular form. The activity of this catalyst increases linearly up to an O:Re ratio close to 0.03. Subsequent addition of oxygen has no effect on activity.
(2)O2 treatment at 300 K of Re2(CO)10/Al2O3 samples completely decarbonylated at 773 K. According to the EXAFS and TEM data, completely decarbonylated samples contain associated Re(II) ions, with Re—Re distances different from those in metallic rhenium. O2 treatment leads to rearrangement in the clusters. Part of the oxygen is adsorbed in the molecular form as O2− on Al ions of the support (TPD and ESR data). The adsorption occurs reversibly and without exchange with the oxygen of the Al2O3. The activity of the catalysts correlates with their molecular oxygen content.
(3) Partial reduction at 473–573 K of Re2(CO)10/Al2O3 preoxidized at 573 K. The concentration of catalytically active Re atoms is assumed to be less than 2–3% of the rhenium content in the catalysts. Metal-carbene complexes active in metathesis are formed, via the oxidation of propylene, by rhenium ions in a high oxidation state.
Библиографическая ссылка:
Danilyuk A.F.
, Kuznetsov V.L.
, Shmachkov V.A.
, Kochubey D.I.
, Chuvilin A.L.
, Yermakov Y.I.
Propylene Metathesis Catalysts Prepared by Interaction of Re2(CO)10 with γ-Al2O3
Journal of Molecular Catalysis (Continued after 1994 as Journal of Molecular Catalysis A: Chemical and Journal of Molecular Catalysis B: Enzymatic). 1988. V.46. N1-3. P.209-228. DOI: 10.1016/0304-5102(88)85095-8 WOS Scopus РИНЦ CAPlusCA OpenAlex
Propylene Metathesis Catalysts Prepared by Interaction of Re2(CO)10 with γ-Al2O3
Journal of Molecular Catalysis (Continued after 1994 as Journal of Molecular Catalysis A: Chemical and Journal of Molecular Catalysis B: Enzymatic). 1988. V.46. N1-3. P.209-228. DOI: 10.1016/0304-5102(88)85095-8 WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Опубликована в печати: | 30 июл. 1988 г. |
| Опубликована online: | 2 окт. 2001 г. |
Идентификаторы БД:
| Web of science: | WOS:A1988P744300016 |
| Scopus: | 2-s2.0-0024035722 |
| РИНЦ: | 30975064 |
| Chemical Abstracts: | 1988:577398 |
| Chemical Abstracts (print): | 109:177398 |
| OpenAlex: | W2015268908 |