Metal-Support Cooperative Effects in Au/VPO for the Aerobic Oxidation of Benzyl Alcohol to Benzyl Benzoate

Nanomaterials
Sebastiano CampisiAlberto Villa

Abstract

This paper studies the cooperative effect of Au nanoparticles deposited on vanadyl pyrophosphate oxide (VPO) in the liquid phase oxidation of benzyl alcohol. VPO was prepared using the classical method by thermally treating VOHPO₄·0.5H₂O precursor in reacting atmosphere at 420 °C for a period of 72 h. Au nanoparticles were deposited by incipient wetness method. The catalysts were characterized by means of XRD, TEM, XPS and Raman. The bulk VPO catalyst contains vanadyl pyrophosphate phase ((VO)₂P₂O₇), and a small amount of VOPO₄. The catalytic system exhibits a high activity in the base-free liquid phase oxidation of alcohols compared to Au on activated carbon, classic catalyst used for this type of reaction. Au/VPO showed a high peculiar selectivity to benzyl benzoate (76%), an important product used in the pharmaceutical and perfume industries. This behavior might be ascribed to the presence of strong acid sites of VPO, as determined by liquid phase titration. Stability tests performed on Au/VPO showed a deactivation of 10% after the first run, but a constant conversion along the following five cycles. This phenomenon can be attributed to the increase of mean Au particle size (from 19.1 to 23.4 nm) after recycling tests as wel...Continue Reading

References

Jul 18, 2002·Chemical Communications : Chem Comm·Silvio CarrettinGraham J Hutchings
Jun 10, 2004·Chemical Reviews·Tamas Mallat, Alfons Baiker
Nov 17, 2006·The Journal of Physical Chemistry. B·Davide FerriAlfons Baiker
Feb 18, 2010·Chemical Communications : Chem Comm·Wenhao FangYe Wang
Jan 30, 2016·Chemical Communications : Chem Comm·Jian JianHe'an Luo

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BETA
X-ray
transmission electron microscopy
Atomic Absorption Spectroscopy
Infrared Spectroscopy

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CasaXPS

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