Glycerol Selective Oxidation to Lactic Acid over AuPt Nanoparticles; Enhancing Reaction Selectivity and Understanding by Support Modification. Issue 11 (7th May 2020)

• Record Type: Journal Article
• Authors: Douthwaite, Mark; Powell, Natasha; Taylor, Aoife; Ford, Grayson; López, José Manuel; Solsona, Benjamin; Yang, Nating; Sanahuja‐Parejo, Olga; He, Qian; Morgan, David J.; Garcia, Tomas; Taylor, Stuart H.
• Is Part Of: ChemCatChem. Volume 12:Issue 11(2020)
• Page Start: 3097
• Page End: 3107
• Publication Date: 2020-05-07
• Subjects: Aerobic Oxidation -- Dehydration -- Glycerol -- Nanocasting -- Lactic Acid.; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202000026
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: A high surface area mesoporous TiO2 material (110 m 2 /g) was synthesised using a nanocasting methodology, utilizing SBA‐15 as a hard template. This material was subsequently used as a support to prepare a series of 1 wt.% AuPt/TiO2 catalysts, synthesised by conventional impregnation and sol‐immobilisation. Catalysts were tested for the oxidation of glycerol to lactic acid and their performance was compared with corresponding catalysts supported on TiO2 −P25, TiO2 ‐anatase and TiO2 ‐rutile. Higher rates of reaction and higher selectivity to lactic acid were observed over nanocast TiO2 supported catalysts. The increased performance of these catalysts was attributed to the presence of Si on the surface of the support, which likely arose from inefficient etching of the SBA‐15 template. The presence of Si in these catalysts was confirmed by X‐ray photoelectron spectroscopy and electron energy loss spectroscopy. It was proposed that the residual Si present increases the Brønsted acidity of the TiO2 support, which can lead to the formation of Lewis acid sites under reaction conditions; both sites are known to catalyse the dehydration of a primary alcohol in glycerol. Typically, under alkaline conditions, lactic acid is formed by the nucleophilic abstraction of a hydrogen. Thus, we propose that the improved selectivity to lactic acid over the nanocast TiO2 supported catalyst is attributed to the co‐operation of heterogeneous and homogeneous dehydration reactions, as both compete directly with a direct oxidation pathway, which leads to the formation of oxidation products such as glyceric and tartronic acid. Abstract : Synopses Nanocasting : Co‐operation between Brønsted and Lewis acid sites and NaOH may lead to improved reaction selectivity for the aerobic oxidation of glycerol to lactic acid over AuPt supported catalysts under alkaline conditions. The physicochemical properties of the catalyst can influence the relative rates of glyceraldehyde oxidation and dehydration.