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- Title
Catalytic and physicochemical properties of Pt/α-GeO<sub>2</sub> systems in reaction of selective hydrogenation of α,β-unsaturated aldehydes in a gas phase.
- Authors
Gebauer-Henke, E.; Touroude, R.; Rynkowski, J.
- Abstract
Hydrogenation of crotonaldehyde in a gas phase over Pt/α-GeO2 catalysts was investigated. The systems were characterized by BET, XRD, TPR, TEM, ToF-SIMS, and FTIR methods. The optimum pretreatment parameters were studied. The best catalytic performance shows the catalyst 5 wt % Pt/α-GeO2 (69% selectivity to crotyl alcohol at 200 μmol s−1 g activity and 10% conversion of crotonaldehyde). Lower loaded catalysts (2 and 1 wt % Pt) show lower, but also promising activity and selectivity. This good catalytic performance was related to the physicochemical properties of the catalyst. GeO2 in the presence of Pt undergoes a partial surface reduction at temperatures higher than 100°C probably leading to the creation of the active Pt-Ge centers responsible for high selectivity to crotyl alcohol. Reduction at a temperature≥200°C deactivates the catalytic systems due to the formation of inactive PtGe alloys.
- Subjects
HYDROGENATION; CROTONALDEHYDE; CATALYSTS; CHEMICAL inhibitors; ALDEHYDES; ORGANIC compounds
- Publication
Kinetics & Catalysis, 2007, Vol 48, Issue 4, p562
- ISSN
0023-1584
- Publication type
Article
- DOI
10.1134/S0023158407040131