Volckmar, Claudia ; Bron, Michael ; Bentrup, Ursula ; Martin, Andreas ; Claus, Peter (2009)
Influence of the support composition on the hydrogenation of acrolein over Ag/SiO₂-Al₂O₃ catalysts.
In: Journal of Catalysis, 261 (1)
doi: 10.1016/j.jcat.2008.10.012
Article, Bibliographie
Abstract
The gas phase hydrogenation of acrolein over supported silver catalysts has been investigated with a focus on the influence of the support acidity. Acidity has been varied by preparing silver catalysts supported on silica/alumina supports with varying SiO2/Al2O3 ratio. After the catalytic experiments the Ag catalysts exhibit similar particle sizes, as revealed with TEM (transmission electron microscopy). The acidity of the samples was estimated using TPD of adsorbed ammonia which gives the total acidity of the samples, furthermore by IR of adsorbed pyridine to identify the Brønsted and Lewis acidity. No Brønsted acidity was found, and the Lewis acidity showed a clear dependence on the support composition. It is shown that a high total acidity and a high amount of strong Lewis acid sites on the catalysts cause a low conversion of acrolein and low selectivity to allyl alcohol. The interaction of silver with the support or effects of the metal–support perimeter are discussed as possible reasons for this behaviour.
| Item Type: | Article |
|---|---|
| Erschienen: | 2009 |
| Creators: | Volckmar, Claudia ; Bron, Michael ; Bentrup, Ursula ; Martin, Andreas ; Claus, Peter |
| Type of entry: | Bibliographie |
| Title: | Influence of the support composition on the hydrogenation of acrolein over Ag/SiO₂-Al₂O₃ catalysts. |
| Language: | English |
| Date: | 1 January 2009 |
| Journal or Publication Title: | Journal of Catalysis |
| Volume of the journal: | 261 |
| Issue Number: | 1 |
| DOI: | 10.1016/j.jcat.2008.10.012 |
| Abstract: | The gas phase hydrogenation of acrolein over supported silver catalysts has been investigated with a focus on the influence of the support acidity. Acidity has been varied by preparing silver catalysts supported on silica/alumina supports with varying SiO2/Al2O3 ratio. After the catalytic experiments the Ag catalysts exhibit similar particle sizes, as revealed with TEM (transmission electron microscopy). The acidity of the samples was estimated using TPD of adsorbed ammonia which gives the total acidity of the samples, furthermore by IR of adsorbed pyridine to identify the Brønsted and Lewis acidity. No Brønsted acidity was found, and the Lewis acidity showed a clear dependence on the support composition. It is shown that a high total acidity and a high amount of strong Lewis acid sites on the catalysts cause a low conversion of acrolein and low selectivity to allyl alcohol. The interaction of silver with the support or effects of the metal–support perimeter are discussed as possible reasons for this behaviour. |
| Uncontrolled Keywords: | Acrolein; Hydrogenation; Ag catalyst; SiO2–Al2O3 support; Acidity |
| Additional Information: | Available online 12. November 2008 |
| Divisions: | 07 Department of Chemistry 07 Department of Chemistry > Ernst-Berl-Institut > Fachgebiet Technische Chemie > Technische Chemie II 07 Department of Chemistry > Ernst-Berl-Institut > Fachgebiet Technische Chemie |
| Date Deposited: | 20 Mar 2009 08:57 |
| Last Modified: | 05 Mar 2013 09:18 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Send an inquiry |
Options (only for editors)
 |
Show editorial Details |
Drucken
Impressum