Catalytic transformation of glycerol on several metal systems supported on ZnO

Deactivation study of supported Pt catalyst on glycerol hydrogenolysis

“…There was also an increase in acidity for the La 2 O 3 support upon incorporation of Pt but only after reduction at 200 • C. Finally, ceria-based catalysts did not increase their acidity on Pt incorporation. The increase in the acidity observed for the catalysts after the incorporation of Pt from H 2 PtCl 6 precursor could be related to the presence of chlorine atoms at the surroundings of the Pt particles [14][15].…”

“…One of the most interesting options is glycerol transformation under hydrogen pressure [2,7,13], consisting in glycerol reduction in such way that there is a dissociation of a C OH chemical bond, the OH group being replaced by a H atom. The main products obtained in glycerol hydrogenolysis are 1-hydroxy-propan-2-one (ACETOL) [14], 1,2-PDO [15], 1,3-PDO [16] and ethylene glycol (EG), the latter involving a C-C cleavage [17]. However, depending on the used catalyst and reaction conditions, other products such as propan-1-ol and propan-2-ol can be obtained in high yields [18].…”

“…Reaction network for the hydrogenolysis of glycerol aqueous solutions over supported metal catalysts. ported on alumina [16], carbon [27], other transition metal oxides [15,28], zeolites [29], etc. In these studies, the role of both metal and surface acid sites in product selectivity has been pointed out as crucial for glycerol transformation into 1,2-PDO [30].…”

Au/Pt/TiO2 catalysts prepared by redox method for the chemoselective 1,2-propanediol oxidation to lactic acid and an NMR spectroscopy approach for analyzing the product mixture

“…The high LA yield of 85-90% was obtained even at low temperatures of 250-290 • C [7]. The supported precious metals (Au, Ir, Pd, Pt, Rh, Ru) catalyzed the glycerol conversion in alkaline solutions under an inert or reducing atmosphere of 2-4 MPa and decreased the temperature of the glycerol conversion to 180-200 • C, but the LA yield was low [8][9][10][11].…”

Thermal conversion of glycerol to value-added chemicals: pyridine derivatives by one-pot microwave-assisted synthesis

“…9−16 Liquid phase reactions are reported in which various homogeneous or heterogeneous acid catalysts have been used, such as sulfonic acid, benzenesulfonic acid, metal phosphates, metal sulfates, alumina, and zeolites, but only around 25% of the glycerol could be converted into acrolein with low selectivity. 17,18 Degradation, polymerization, and tar formation have been the main side reactions of the liquid-phase dehydration of glycerol.…”