Acid-base property of the supporting material controls the selectivity of Au catalyst for glycerol oxidation in base-free water

Glycerol aerobic oxidation to glyceric acid over Pt/hydrotalcite catalysts at room temperature

“…GLYA and DHA are the two main products obtained in this reaction, and the other products from over-oxidation (TTA) and C-C bond fracture (C 2 products) can also be found ( Table 2). For example, the contents of TTA and C 2 -products (glycolic acid and oxalic acid) rise with the increase of Mg/Al ratio but both of them show the lower selectivity (2.4% and 1.9%) compared with previous reports (>5% and >4%) [42,43]. This is likely attributed to the lower reaction temperature in this work (room temperature), which leads to less extent of side reaction.…”

Ordered Mesoporous Carbon‐supported Morphologically‐controlled Nano‐Gold: Role of Support as well as the Shape and Size of Gold Nanoparticles on the Selective Oxidation of Glycerol

“…and Zhao et al [66] . The carbon balance of the products in the current work is consistent with other reports [67] …”

“…In this reaction, the carbon balance of the liquid products is nearly ~95 % and the remaining might be the gaseous product CO 2 (not identified in the present case) which is similar to the reports of Liu et al [65] and Zhao et al [66] The carbon balance of the products in the current work is consistent with other reports. [67] Characterisation of Recycled Catalyst: TEM images of Au-sol (Figure 5a) indicate that the nano-gold is agglomerated after the reaction (Figure 5b). A similar observation was also be made for the activated carbon supported catalyst (Figure 11).…”

On the Mechanistic Origins of the pH-Dependency in Au-Catalyzed Glycerol Electro-Oxidation: Insight from First Principles Calculations

“…This hypothesis can possibly be experimentally tested by doping Au with more basic metals or by decorating Au with basic oxides. 2,[84][85][86][87][88] In addition to the direct influence on reaction thermodynamics and kinetics, solution pH was found to affect EOG selectivity via keto-enol tautomerism between DHA and GLD. The computed reaction free energy demonstrates that DHA-GLD tautomerism is thermoneutral under alkaline conditions and offers an alternative pathway to form GLD from DHA.…”