Methanobactin‐mediated synthesis of bimetallic Au–Pd/Al ₂ O ₃ toward an efficient catalyst for glucose oxidation

Abstract

A green bioreductive approach with methanobactin was adopted to fabricate bimetallic Au-Pd/AlO catalysts for solvent-free oxidation of glucose to gluconic acid with HO 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/AlO were investigated. The Au-Pd/AlO 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 g and selectivity 99.6% were attained at 323 K with HO. The results indicated the activity and selectivity was affected by the ratio of Au/Pd on the AlO. The formation of AuPd/AlO was favourable for the catalytic reaction.

Efficient ABEI–Dissolved O2–Ce(III, IV)-MOF Ternary Electrochemiluminescent System Combined with Self-Assembled Microfluidic Chips for Bioanalysis

“…To further observe the microstructure, we characterized ABEI–PEI–Au–Pd by high-resolution transmission electron microscopy (HRTEM), showing a uniform particle size distribution and good dispersion (Figure B). In Figure C, the lattice fringe spacings of the Au–Pd bimetallic nanocrystals were 0.236 and 0.225 nm, corresponding to Au(111) and Pd(111) crystal planes, respectively . In Figure D, the energy-dispersive spectroscopy (EDS) spectrum of ABEI–PEI–Au–Pd exhibited all the elements contained in it.…”

Structural sensitivity of heterogeneous catalysts for sustainable chemical synthesis of gluconic acid from glucose

“…The long-term stability of the catalyst was tested in a continuous reactor. Xin et al [101] prepared Au-Pd/Al2O3 catalysts using a bio-reductive approach and evaluated their performances for the oxidation of glucose with H2O2 at atmospheric pressure. The Au0.8-Pd0.2/Al2O3 catalyst exhibited the TOF of 8.51 s -1 at 323 K when H2O2 was used as the oxidant (Table 2, #16).…”

Compatibility between Activity and Selectivity in Catalytic Oxidation of Benzyl Alcohol with Au–Pd Nanoparticles through Redox Switching of SnOx

“…Au–Pd bimetallic catalysts are the most frequently reported for benzyl alcohol partial oxidation, − and a catalytic synergy between these two metals has been observed. This catalytic synergy was attributed to the formation of Au–Pd alloy NPs and electron transfer between surface Au and Pd atoms, preventing the formation of inert surface PdO species. − Metallic Pd 0 -enriched clusters/surfaces have been reported as active sites for O 2 activation; − however, Pd 0 -enriched surfaces are usually coated with a layer of inert PdO. , This contradictive condition has been improved to a certain extent by introducing Au to Pd with a H 2 reduction process.…”