Summary
This laboratory study demonstrates that Au-Pt/ZrO2 catalysts prepared by co-impregnation with ultrasonication significantly improve the selective oxidation of glucose to glucaric acid under base-free conditions in aqueous phase. The presence of a pure AuPt alloy was identified as critical for selectivity, with ultrasonication reducing by-products and increasing glucaric acid yield to approximately 71%. An optimal Au/Pt atomic ratio of approximately 1.1 was determined to balance catalytic activity and selectivity.
UK applicability
This research is relevant to the United Kingdom's chemical and biochemical industries exploring sustainable sugar platform chemistry and valorisation of carbohydrate feedstocks. The base-free catalytic methodology aligns with green chemistry principles applicable to UK biorefinery development, though practical scaling and economic viability would require further investigation.
Key measures
Glucaric acid yield (%), by-product formation, Au/Pt atomic ratio, catalyst selectivity, conversion efficiency
Outcomes reported
The study evaluated the catalytic performance of ultrasonication-prepared Au-Pt/ZrO2 catalysts for selective glucose oxidation to glucaric acid under base-free aqueous conditions. Key metrics included glucaric acid yield, by-product formation, and effects of Au/Pt ratio and preparation method on catalyst efficiency.
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