Journal
CHINESE JOURNAL OF CHEMISTRY
Volume 30, Issue 9, Pages 2189-2197Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.201200271
Keywords
bimetallic Au-Pd nanoparticles; Mg-Al mixed oxides; selective oxidation; benzyl alcohol; glycerol; molecular oxygen
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Funding
- National Natural Science Foundation of China [20973079, U1162201]
- State Basic Research Project of China [2009CB623501]
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Nano-sized Au and Pd catalysts are favorable for oxidations with molecular oxygen, and the preparation of this kind of nanoparticles with high catalytic activities is strongly desirable. We report a successful synthesis of bimetallic Au-Pd nanoparticles with rich edge and corner sites on unique support of Mg-Al mixed oxides (Au-Pd/MAO), which are favorable for producing metal nanoparticles with high degree of coordinative unsaturation of metal atoms. The systematic microscopic characterizations confirm the bimetallic Au-Pd nanoparticles are present as Au-Pd alloy. The irregular shape of the bimetallic nanoparticles are directly observed in HRTEM images. As we expected, Au-Pd/MAO gives very excellent catalytic performances in the aerobic oxidation of benzyl alcohol and glycerol. For example, Au-Pd/MAO shows very high TOF of 91000 h-1 at 433 K with molecular oxygen at air pressure in solvent-free oxidation of benzyl alcohol; this catalyst also shows relatively high selectivity for tartronic acid (TARAC, 36.6%) at high conversion (98.5%) in aerobic oxidation of glycerol. The superior catalytic properties of Au-Pd/MAO would be potentially important for production of fine chemicals.
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