Journal
ACS CATALYSIS
Volume 5, Issue 4, Pages 2659-2670Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs502093b
Keywords
gold; mesoporous carbon; glucose oxidation; base-free condition; gluconic acid
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Funding
- MOST of China [2011CBA00508]
- NSFC [21403178, 21473145]
- Research Fund for the Doctoral Program of Higher Education [20110121130002]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_14R31]
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An ordered mesoporous carbon (CMK-3)supported gold catalyst was prepared and used in the aerobic oxidation of glucose to gluconic acid under base-free conditions with molecular oxygen. XRD and TEM results revealed that gold nanoparticles were uniformly dispersed on the surface and in the channels of CMK-3. Catalytic tests showed that conversion remarkably increased with decreased selectivity when oxygen pressure and reaction temperature were increased. Glucose conversion to gluconic acid reached over 92% with 85% selectivity under the conditions of 383 K reaction temperature, 0.3 MLPa oxygen pressure, and 2 h reaction time. Hydrogen peroxide was generated during reaction, and the relationship between hydrogen peroxide and the byproduct fructose was discussed. Low glucose/Au molar ratio minimized fructose formation. A 92% gluconic acid yield was obtained after reaction for 15 min when the molar ratio of glucose/Au was set to 100. The spent catalyst treated with an aqueous solution of NaOH at 363 K could produce glucose conversion up to 87%, which was close to the result of as-prepared catalyst and excluded the effect of alkaline residues.
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