Antimony-Modified Platinum Catalysts for the Selective and Stable Oxidation of Cinnamyl Alcohol with Hydrogen Peroxide
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Platinum-antimony and platinum-bismuth deposited on activated carbon were prepared by various methods. The materials were characterized by nitrogen physisorption, X-ray diffraction and high-resolution transmission electron microscopy. The samples were tested as catalysts for the selective oxidation of cinnamyl alcohol to cinnamaldehyde, using H2O2 as the oxidant. 5%Pt–5%Sb/C shows selectivities in excess of 98 % in both water and toluene as the reaction medium. In comparison, state-of-the art bismuth catalysts give selectivities of 73–95 % (in water) and 84 % (in toluene).
KeywordsSelective oxidation Hydrogen peroxide Platinum Antimony Sonication Cinnamyl alcohol Cinnamaldehyde
This material is based upon work supported financially by the National Research Foundation of South Africa under Grant Unique Number 63266. The authors thank Dr. Sabine Verryn (XRD Analytical and Consulting, Pretoria) for help with the interpretation of X-ray diffraction data, and Evonik (Germany) for a free catalyst sample.
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