Journal
CHEMCATCHEM
Volume 4, Issue 9, Pages 1330-1336Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201200008
Keywords
green chemistry; gold; nanoparticles; oxidation; titanium
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Funding
- King Abdulaziz City for Science and Technology (KACST)
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Adipic acid (AA) is one of the highest volume chemicals in world use with a wide range of commercial applications. This paper demonstrates the possibility of producing significant proportions of AA by the selective oxidation of cyclohexane (CH) in one step using various supported gold-nanoparticle (AuNP) catalysts. The catalysts were characterized by ICP, BET, XRD, X-ray photoelectron microscopy, and TEM. The catalytic activity tests were carried out in the liquid phase using autoclaves in the temperature range of 100170?degrees C at 10 bar. A CH conversion of over 25?%, with 26% selectivity of AA and 70% selectivity of KA oil (cyclohexanone+cyclohexanol), was achieved over a nano-gold/TiO2 (anatase) catalyst. The superior performance of this catalyst is attributed to the smaller size of AuNPs, which has an average particle size of 2 nm. Good correlation between activity and Au particle size could be achieved. Overall, the particle size of the AuNPs showed a strong influence on catalytic performance.
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