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Received November 29, 2016
Accepted April 4, 2017
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Heterogeneous amino acid-based tungstophosphoric acids as efficient and recyclable catalysts for selective oxidation of benzyl alcohol

Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou 310018, China 1College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China 2Institute of Atom and Molecular Sciences, Academic Sinica,, Taipei 10617, Taiwan
hxx74@126.com
Korean Journal of Chemical Engineering, July 2017, 34(7), 1914-1923(10), 10.1007/s11814-017-0097-y
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Abstract

A series of organic-inorganic composite catalysts, prepared by modifying tungstophosphoric acid (TPA; H3PW12O40) with different amino acids such as phenylalanine (Phe), alanine (Ala), and glycine (Gly) were synthesized. The physicochemical and acidic properties of these (MH)xH3-xPW12O40 (M=Phe, Ala, and Gly; x=1-3) composite materials were characterized by a variety of different analytical and spectroscopic techniques, namely TGA, XRD, FTIR, XPS, and NMR, and exploited as heterogeneous catalysts for selective oxidation of benzyl alcohol (BzOH) with hydrogen peroxide (H2O2). Among them, the [PheH]H2PW12O40 catalyst exhibited the best oxidative activity with an excellent BzOH conversion of 99.0% and a desirable benzaldehyde (BzH) selectivity of 99.6%. Further kinetic studies and model analysis by response surface methodology (RSM) revealed that the oxidation of BzOH with H2O2 follows a second-order reaction with an activation energy of 56.7 kJ·mol-1 under optimized experimental variables: BzOH/H2O2 molar ratio=1 : 1.5mol/mol, amount of catalyst=6.1 wt%, reaction time (x3)=3.8 h, and amount of water (x4)=30.2mL.

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