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Ruthenium-doped Titania-pillared Clay for The Selective Catalytic Oxidation of Cyclohexene: Influence of Ru Loading

1Laboratory of Catalysis and Synthesis in Organic Chemistry, Faculty of Science, Abou Bakr Belkaϊd University, P.O.Box 119 - Tlemcen 13000, Algeria

2Faculty of Hydrocarbons, Renewable Energy, Earth Sciences and Universe, Kasdi Merbah University, Ouargla 30000, Algeria

Received: 22 Apr 2019; Revised: 11 Jul 2019; Accepted: 16 Jul 2019; Published: 1 Dec 2019; Available online: 30 Sep 2019.
Open Access Copyright (c) 2019 by Authors, Published by BCREC Group under http://creativecommons.org/licenses/by-sa/4.0.

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Abstract

A series of ruthenium-based catalysts supported on acid-activated montmorillonite (PILC) and interspersed with titanium (Ru/Ti-PILCs) were prepared with various amounts of ruthenium. Their catalytic performances in the selective oxidation of cyclohexene, using tert-butylhydroperoxide (TBHP) as oxidant were checked. The clay structure modification by acid activation and impregnation of transition metals resulted in an enhanced Lewis and Bronsted acidities. The Ru/Ti-PILCs materials were characterized using X-ray diffraction (XRD), surface area and pore volume measurements, surface acidity followed by Fourier transform infrared (FTIR) spectroscopy, chemical analysis, and Scanning Electron Microscopy (SEM). It was found that all catalysts can selectively oxidize cyclohexene through allylic oxidation leading mainly to 2-cyclohexene-1-one (Enone) as the major product, and 2-cyclohexene-1-ol (Enol) as secondary product. With the 5 %Ru/Ti-PILC, it was possible to reach 59 % cyclohexene total conversion, and 87 % selectivity into 2-cyclohexene-1-one and 13 % selectivity into 2-cyclohexene-1-ol. 

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Keywords: Cyclohexene; Pillared clay; Ruthenium; Selective oxidation; TBHP

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