The selective oxidation of 1,2-propanediol to lactic acid using mild conditions and gold-based nanoparticulate catalysts

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

“…As for Pt-imp/CNTs and Pt-out/CNTs, the Pt 0 peaks for Pt4f7/2 appear at 71.9 and 71.7 eV, respectively, and the Pt4f7/2 signal shifts positively by 0.8 and 0.6 eV with respect to pure Pt. The positive shift of the Pt 0 peak should be attributed to the presence of small nanoparticles [36,37], which agrees well with the TEM spectra in Figure 1. Table 2 shows the phenol hydrogenation performances of Pt-in/CNTs, Pt-imp/CNTs, and Pt-out/CNTs.…”

Lactic acid production from aqueous-phase selective oxidation of hydroxyacetone

“…As a matter of fact the use of other organic compounds easily obtained from glycerol may also be a promising alternative as they can allow producing lactic acid under much milder conditions. 1,2-propanediol, dihydroxyacetone and hydroxyacetone or acetol can be listed amongst the most suitable glycerol intermediates [20][21][22][23][24][25].…”

Selectively catalytic oxidation of 1,2-propanediol to lactic, formic, and acetic acids over Ag nanoparticles under mild reaction conditions

“…Xu et al [29] found that the 2.8%Au/MgO catalyst showed high catalytic activity in the 1,2-propanediol oxidation reaction, giving the 1,2-propanediol conversion of 94.4%, lactic acid selectivity of 89.3%, and acetic acid selectivity of 10.7% under 0.3 MPa O 2 at 60°C. Hutchings et al [23,25] and Medlin et al [26] have studied the oxidation of 1,2-propanediol over carbon-supported Au-Pd and Au-Pt bimetallic catalysts. As compared to the monometallic catalysts, the bimetallic catalysts showed high catalytic activity in the oxidation reaction.…”

“…Recently, research effort has mainly focused on the catalyst development for selective oxidation of 1,2-propanediol to lactic acid [22][23][24][25][26][27][28][29]. Prati et al [22] reported that the 1,2-propanediol conversion and the lactic acid selectivity were 80% and 100%, respectively, when the oxidation of 1,2-propanediol was catalyzed by 1%Au/C catalyst at 90°C and 0.3 MPa O 2 .…”

“…1,2-Propanediol derived from biomass-based polyols including glycerol and sorbitol via hydrogenolysis [17][18][19][20][21] has been now considered as an alternative and renewable carbon source for the synthesis of many highly value-added chemicals, such as lactic acid [22][23][24][25][26][27][28][29], pyruvic acid [30], acetic acid [22][23][24][25][27][28][29], formic acid [22][23][24][25][27][28][29], hydroxyacetone [24], propionic acid [31], and propanol [31], via either catalytic oxidation or bioconversion processes. However, 1,2-propanediol is facing the oversupply problem, especially in China, due to its limited demand in the production of organic solvent and unsaturated polyester resin [32,33] and the scaling-up coproduction of dimethyl carbonate and 1,2-propanediol by transesterification method [34].…”