| Autor: |
Ana Cláudia Bernardes Silva, Ana Paula Guimarães de Sousa, José Domingos Ardisson, Helmuth Guido Luna Siebald, Edmilson Moura, Eduardo Nicolau dos Santos, Nelcy Della Santina Mohallem, Rochel Montero Lago |
| Jazyk: |
angličtina |
| Rok vydání: |
2003 |
| Předmět: |
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| Zdroj: |
Materials Research, Vol 6, Iss 2, Pp 137-144 (2003) |
| Druh dokumentu: |
article |
| ISSN: |
1516-1439 |
| DOI: |
10.1590/S1516-14392003000200005 |
| Popis: |
In this work highly dispersed Ru-Sn bimetallic catalysts have been prepared from organobimetallic Cp(PPh3)2Ru-SnX3 (X = Cl or Br) complexes. These single source precursors can be easily impregnated in high surface area supports, such as activated carbon and sol-gel SiO2, and upon controlled thermal treatment the ligands are released as volatile products resulting in the formation of the bimetallic system Ru-Sn. Catalytic reactions, such as hydrodechlorination of CCl4 and chlorobenzene and TPR (Temperature Programmed Reduction) experiments carried out with these RuSn catalysts suggested a strong interaction between Ruthenium and Tin. Mössbauer measurements showed that these materials when exposed to air are immediately oxidized to form Sn (IV). It was shown that upon controlled reduction conditions with H2 it is possible to reduce selectively Sn to different oxidation states and different phases. The Sn oxidation state showed significant effect on the catalytic hydrogenation of 1,5-cyclooctadiene. The use of these single source precursors with a controlled decomposition/reduction procedure allows the preparation of unique catalysts with an intimate interaction between the components ruthenium and tin and the possibility of varying the Sn oxidation state around the Ru metal. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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