In 2013,D’Agostino, Carmine; Kotionova, Tatyana; Mitchell, Jonathan; Miedziak, Peter J.; Knight, David W.; Taylor, Stuart H.; Hutchings, Graham J.; Gladden, Lynn F.; Mantle, Mick D. published 《Solvent Effect and Reactivity Trend in the Aerobic Oxidation of 1,3-Propanediols over Gold Supported on Titania: NMR Diffusion and Relaxation Studies》.Chemistry – A European Journal published the findings.Formula: C4H8O3 The information in the text is summarized as follows:
In recent work, it was reported that changes in solvent composition, precisely the addition of water, significantly inhibits the catalytic activity of Au/TiO2 catalyst in the aerobic oxidation of 1,4-butanediol in methanol due to changes in diffusion and adsorption properties of the reactant. In order to understand whether the inhibition mechanism of water on diol oxidation in methanol is generally valid, the solvent effect on the aerobic catalytic oxidation of 1,3-propanediol and its two methyl-substituted homologues, 2-methyl-1,3-propanediol and 2,2-dimethyl-1,3-propanediol, over a Au/TiO2 catalyst has been studied here using conventional catalytic reaction monitoring in combination with pulsed-field gradient NMR (PFG-NMR) diffusion and NMR relaxation time measurements. Diol conversion is significantly lower when water is present in the initial diol/methanol mixture A reactivity trend within the group of diols was also observed Combined NMR diffusion and relaxation time measurements suggest that mol. diffusion and, in particular, the relative strength of diol adsorption, are important factors in determining the conversion. These results highlight NMR diffusion and relaxation techniques as novel, non-invasive characterization tools for catalytic materials, which complement conventional reaction data.Methyl 3-hydroxypropanoate(cas: 6149-41-3Formula: C4H8O3) was used in this study.
Methyl 3-hydroxypropanoate(cas: 6149-41-3) belongs to esters with low molecular weight are commonly used as fragrances and found in essential oils and pheromones. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Formula: C4H8O3
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics