Abstract
Glycerol valorization through partial oxidation is a good way of obtaining many different molecules with high added value such as glyceric acid, tartronic acid, dihydroxyacetone, etc. Among the potential products, glyceraldehyde is an interesting chemical compound for its various applications in different domains such as organic chemistry, medical, and cosmetic industries. In the present paper, we studied the effect of different supports on the glycerol oxidation reaction in a batch reactor applying base-free conditions. The tested catalysts were Pt-based materials deposited on various supports (i.e., SiO2, TiO2, ZSM-5, γ-Al2O3), which were synthesized using a deposition method followed by a chemical reduction. The catalysts were extensively characterized (BET, ICP, XRD, TEM, XPS), highlighting differences in terms of specific surface areas, textural properties, and Pt nanoparticles sizes. We evidenced a direct relation between glycerol conversion and glyceraldehyde selectivity (i.e., an increase in glycerol conversion leads to a decrease in glyceraldehyde selectivity). The Pt/γ-Al2O3 catalysts exhibited the highest activity, but their selectivity to glyceraldehyde significantly decreased with time on stream. Pt/SiO2 presented the highest selectivity to glyceraldehyde owing to a slower reaction rate, which allows envisioning technical opportunities to continuously extract the formed glyceraldehyde from the mixture.
Highlights
Biomass efficient valorization is an important challenge to ensure the viability of our various industrial sectors (Katryniok et al, 2011; Skrzynska et al, 2015)
The clear appearance of characteristic diffraction peaks assigned to metallic platinum over SiO2 and ZSM-5 suggests the presence of Pt particles larger than 5 nm, which will be confirmed by TEM analysis
The silicic supports studied generate aggregation of the platinum particles leading to a high average particle size (i.e., 6.5 nm) Contrary to that, using TiO2 or γ-Al2O3 as supports leads to very small particles (i.e., 2.7 nm) with a narrow size distribution
Summary
Biomass efficient valorization is an important challenge to ensure the viability of our various industrial sectors (Katryniok et al, 2011; Skrzynska et al, 2015). The platinum-based materials deposited on various supports (i.e., SiO2, TiO2, γ -Al2O3, ZSM-5) were prepared by chemical reduction in the liquid phase.
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