Biofuel synthesis from sorbitol by aqueous phase hydrodeoxygenation over bifunctional catalysts: In-depth study of the Ru-Pt/SiO-AlO catalytic system
Catalysts, ISSN: 2073-4344, Vol: 9, Issue: 2
2019
- 4Citations
- 14Captures
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Article Description
The catalytic performances of Ru-Pt/SiO-Al O catalysts synthetized by three methods (co-impregnation (CI), successive impregnations (SI) and redox deposition (CR)) were compared for their sorbitol transformation to hexane under hydrothermal conditions. The existence of Pt-Ru interaction was demonstrated by TEM-EDX only on SI and CR samples, with a PtRu alloy suspected by XRD and XPS. The chemical nature of the Ru species differed according to the synthesis method with the presence of Ru species on SI-(Ru-Pt) and CR catalysts. The SI-(Ru-Pt)/SiO-AlO system displayed the best metal-acid function balance leading to the highest selectivity to hexane. The study of the reactivity of isosorbide and 2,5-dimethylfuran intermediates highlighted that the first one was poorly reactive compared to the second one, and the latter was selectively convertible to hexane. The synergy effect on SI-(Ru-Pt)/SiO-AlO catalyst was attributed to the presence of small-sized bimetallic particles favoring an electronic exchange from Ru to Pt, and increasing the formation of 2,5-dimethylfuran.
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