Promoting Role of Bismuth on Hydrotalcite-Supported Platinum Catalysts in Aqueous Phase Oxidation of Glycerol to Dihydroxyacetone

Abstract

Abstract:Bismuth plays important roles in promoting the oxidation of alcohols towards high-valueadded chemicals over a noble metal loading catalyst. Herein, Mg-Al hydrotalcite-supported platinum-bismuth nanoparticles (Pt-Bi/HT) were prepared by the co-impregnation method and used in the selective oxidation of glycerol towards dihydroxyacetone (DHA). The incorporation of Bi species into Pt/HT significantly enhances the conversion of glycerol and the selectivity of DHA. The high selectivity of DHA with 80.6% could be achieved at 25.1% conversion of glycerol. The Bi species of the Pt-Bi/HT catalyst mainly exist in the form of BiOCl and Bi metal, which is different from the previous Pt-Bi based catalyst, confirmed by a combination of powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HR-TEM). A plausible mechanism is proposed to elucidate the promoting role of Bi species on the Pt/HT catalyst in the selective oxidation of glycerol towards DHA.

Acetalization Catalysts for Synthesis of Valuable Oxygenated Fuel Additives from Glycerol

“…A large number of value-added chemicals such as propanediols [39], acrolein [40], dihydroxyacetone [41], glyceric acid [42], hydrogen [43], synthesis gas [44], esters [45,46], etc., can be produced from glycerol using oxidation, reduction and other catalytic reactions (Scheme 1). Oxidation of primary, secondary, and all three groups yields different molecules of C 3 acids, aldehydes, and ketones [47,48]. Selective hydrogenolysis of glycerol in the presence of metallic catalysts and hydrogen can produce 1.2-propanediol (1.2-PDO) [49], 1.3-propanediol (1.3-PDO), or ethylene glycol (EG).…”

Efficient production of dihydroxyacetone from glycerol over a Pt/CeO2-ZrO2-Bi2O3/SBA-16 catalyst

“…32 h [3]; this process requires a long operation time, however, and strict controls of the pH, temperature, and dissolved oxygen concentration to control bacteria. Several selective oxidation methods have also been suggested for DHA production, including photo-catalyst [4], electro-catalyst [5,6], homogeneous catalyst [7,8], and heterogeneous catalyst methods [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. From the viewpoint of determining a convenient process, heterogeneous catalysts have received attention as means of achieving the transformation.…”

General and Prospective Views on Oxidation Reactions in Heterogeneous Catalysis

“…There is thus a need for the development of novel routes for the production of acrolein, such as the conversion of allyl alcohol, produced by fermentation or dehydration of 1,3-propanediol or dehydration/oxidation of glycerol [19]. Glycerol or allyl alcohol partial oxidation to dihydroxyacetone and to acrylic acid have also been largely studied and published in the open literature [20][21][22][23][24]. Oxidehydration of glycerol into acrylic acid has been reported using multifunctional catalysts able to carry out in a single-step transformation its dehydration to acrolein and further oxidation into acrylic acid, both in gaseous and liquid phases [17].…”