Methanobactin‐mediated synthesis of bimetallic Au–Pd/Al2 O3 toward an efficient catalyst for glucose oxidation

• Published in: IET nanobiotechnology 2017-08, Vol.11 (5), p.512-516
• Main Authors: Xin, Jia‐ying, Fan, Hong‐chen, Ji, Sheng‐fu, Wang, Yan, Xia, Chun‐gu
• Format: Article
• Language: English
• Subjects: aluminium compounds; Au‐Pd‐Al2 O3; Au‐to‐Pd molar ratio; bimetallic Au‐Pd‐Al2 O3 catalysts; bimetallic Au‐Pd‐Al2 O3 methanobactin‐mediated synthesis; biochemistry; biological techniques; catalysis; catalysts; catalytic reaction; diffuse reflectance UV‐vis spectroscopy; gluconic acid; glucose oxidation; glucose solvent‐free oxidation; gold; green bioreductive approach; lead; oxidation; sugar; temperature 323 K; transmission electron microscopy; ultraviolet spectra; visible spectra; X‐ray diffraction; X‐ray photoelectron spectra; X‐ray photoelectron spectroscopy
• ISSN: 1751-875X; 1751-8741; 1751-875X
• DOI: 10.1049/iet-nbt.2016.0168

A green bioreductive approach with methanobactin was adopted to fabricate bimetallic Au–Pd/Al2 O3 catalysts for solvent‐free oxidation of glucose to gluconic acid with H2 O2 at atmospheric pressure. The catalyst was characterised by diffuse reflectance UV–vis spectroscopy, transmission electron microscopy, X‐ray photoelectron spectroscopy, and X‐ray diffraction techniques to understand synergistic interactions between Au and Pd. Effects of Au to Pd molar ratio on the catalytic activity of Au–Pd/Al2 O3 were investigated. The Au–Pd/Al2 O3 catalyst with Au/Pd molar ratio of 0.8:0.2 exhibited excellent catalytic performance. With the catalyst, the oxidation activities of glucose to gluconic acid 2856 mmol min−1 g−1 and selectivity 99.6% were attained at 323 K with H2 O2. The results indicated the activity and selectivity was affected by the ratio of Au/Pd on the Al2 O3. The formation of Au0.8 Pd0.2 /Al2 O3 was favourable for the catalytic reaction.