Composition dependent selectivity of bimetallic Au-Pd NPs immobilised on titanate nanotubes in catalytic oxidation of glucose

Motaz Khawaji, Yiming Zhang, Melody Loh, Inês Graça, Ecaterina Ware, David Chadwick*

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The catalytic performance of Au-Pd nanoparticles (NP) prepared by colloidal synthesis and immobilised on titanate nanotubes (Ti-NT) in the selective oxidation of glucose to gluconic and glucaric acids has been studied under initially basic and relatively mild conditions. Catalysts with varying compositions displayed quite different product selectivity especially in relation to deeper oxidation. The yield of glucaric acid was found to be proportional to the atomic content of Au in the Au-Pd NPs: Au/Ti-NT exhibited the highest selectivity to glucaric acid, while Au15Pd85/Ti-NT displayed the highest selectivity to gluconic acid, SGLO > 98%. Catalyst recycling revealed deactivation, which appears to be due to a combination of metal leaching, particle size changes and product adsorption, and is associated with the gradual fall in pH of the reaction mixture. Results suggest that the leached Au species play a significant role in the oxidation of gluconic to glucaric acid.

Original languageEnglish
Article number117799
JournalApplied Catalysis B: Environmental
Volume256
Early online date31 May 2019
DOIs
Publication statusPublished - 5 Nov 2019

Keywords

  • Au-Pd
  • Glucose
  • Selective oxidation
  • Sol-Immobilisation
  • Titanate nanotubes

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