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Efficient Oxidation of Benzyl Alcohol to Benzaldehyde with Hydrogen Peroxide Mediated by Palladium Chloride Impregnated on Aluminium Oxide-Pillared Clay

Piyarat Trikittiwong, Danainat Surakiet, Nutthaya Aksornkovit, Kittichai Chaiseeda, Ritbey Ruga, Manuela Stan

Abstract


Aldehydes, such as benzaldehyde, are very important in many industries and can be prepared from alcohols. In this research, aluminium oxide-pillared bentonite (Al-PILC) was prepared by inserting aluminium (III) chloride into the interlayers and calcination. Then PdCl2 was impregnated into Al-PILC and calcined to produce Pd/Al-PILC. The synthesized clay and raw clay were characterized by X-ray diffraction (XRD) and N2 adsorption-desorption (Brunauer-Emmett-Teller; BET) techniques. From the characterization, XRD pattern exhibited the characteristic peaks of montmorillonite at 2θ of 7° and 22°. Additionally, the N2 adsorption-desorption isotherm of Pd/Al-PILC indicated mesoporous structure and BET specific surface area was 102 m2/g. The catalytic activity of Pd/Al-PILC was investigated for the oxidation of benzyl alcohol with H2O2 furnishing benzaldehyde. In the optimum condition, 82% of benzaldehyde was produced via the reaction of benzyl alcohol and H2O2 in the presence of a catalytic amount of Pd/Al-PILC in refluxing acetonitrile for 3 h under mild reaction conditions.

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DOI: 10.14416/j.asep.2022.08.004

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