DOI: https://doi.org/10.9767/bcrec.9.1.5603.28-38

The Role of Ti and Lewis Acidity in Manganese Oxide Octahedral Molecular Sieves Impregnated with Titanium in Oxidation Reactions

Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia

Received: 18 Oct 2013; Revised: 4 Jan 2014; Accepted: 4 Jan 2014; Available online: 12 Mar 2014; Published: 30 Apr 2014.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2014 by Authors, Published by BCREC Group
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
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Abstract
Octahedral manganese oxide molecular sieves (OMS-2) was prepared by precipitation method and modified by impregnation of titanium with different titanium/manganese (Ti/Mn) ratio. It was also discovered that Ti/Mn ratio of less than 0.5 still retains the original pure cryptomelane structure of OMS-2. However, for sample with Ti/Mn ratio of more than 0.5, some rutile phases of titania (TiO2) can be detected together with the cryptomelane phase. Lewis acid sites were also observed in the titanium modified OMS-2 (Ti-OMS-2). Ti-OMS-2 was then used as catalysts for the oxidation of cyclohexane, cyclohexene and styrene, where Ti-OMS-2 with Ti/Mn ratio of 0.67 was most active in all three of the oxidation reactions as compared to TiO2 and OMS-2. The results suggest that both titanium sites in framework and non-framework and the Lewis acidity created by the impregnation of Ti, increased the activity of OMS-2 in oxidation reactions. © 2014 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0)
Keywords: Titanium-impregnated manganese oxide molecular sieves; oxidation; Lewis acidity; framework and non-framework Ti
Funding: Ministry of Science, Technology and Innovation Malaysia (MOSTI) under contract Science Fund; Ministry of Higher Education Malaysia (MOHE) under contract Fundamental Research Grant Scheme

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Section: Original Research Articles
Language : EN
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