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Preparation, Characterization, and Catalytic Activity of Tin (Antimony) Substituted and Lacunar Dawson Phosphotungstomolybdates for Synthesis of Adipic Acid

1Laboratoire de Chimie du Gaz Naturel, Faculté de Chimie, Université des Sciences et de la Technologie Houari Boumediene (USTHB), BP 32, El-Alia, 16111 Bab-Ezzouar, Alger, Algeria

2Centre de Recherche Scientifique et Technique en Analyse Physico-chimique CRAPC, BP 384, Zone Industrielle Bou-Ismail, RP 42004 Tipaz, Algeria

3Laboratoire de Recherche de Chimie Appliquée et de Génie Chimique, Hasnaoua I, Université Mouloud Mammeri B.P.17 RP, 15000 Tizi-Ouzou, Algeria

Received: 6 Jul 2018; Revised: 21 Nov 2018; Accepted: 4 Dec 2018; Available online: 30 Apr 2019; Published: 1 Aug 2019.
Editor(s): Dmitry Murzin
Open Access Copyright (c) 2019 by Authors, Published by BCREC Group under

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Tin (antimony) substituted and lacunar Dawson phosphotungstomolybdates (a1-K10P2W12Mo5ÿO61, a1-K8P2W12Mo5SnO61 and a-Cs4SnP2W12Mo6O62,and a-Cs3SbP2W12Mo6O62) were synthesized and characterized by Fourier Transform Infra Red (FTIR), nuclear magnetic resonance (31P NMR), Visible Ultra Violet (UV-Vis) spectroscopy, and X-ray diffraction (XRD). Their catalytic properties were examined in the oxidation reaction of cyclohexanone at 90 °C and that of cyclohexene at 70 °C to adipic acid (AA), in presence of hydrogen peroxide and in free solvent. The effects of catalyst/substrate molar ratios, hydrogene peroxide flow rate, heteropolysalt composition, and cyclohexanol addition on AA yields were studied. The Cs4SnP2W12Mo6O62 (the most efficient) led to 61 % of AA yield from the cyclohexanone oxidation using a catalyst/substrate molar ratio of 13.3×10-4, H2O2 flow rate of 0.5 mL/h, and a reaction time of 20 h. 

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Keywords: Dawson; polyoxometalate; adipic acid; cyclohexanone; cyclohexene
Funding: Ministry of Higher Education and Scientific  Research, Algeria

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