Nanoscale manganese oxide octahedral molecular sieves (OMS-2) as efficient photocatalysts in 2-propanol oxidation

Journal article

Authors / Editors

King'ondu, Cecil

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Publication Details

Author list: Iyer A, Galindo H, Sithambaram S, King'ondu C, Chen CH, Suib SL

Publisher: Elsevier

Place: AMSTERDAM

Publication year: 2010

Journal: Applied Catalysis A: General (0926-860X)

Journal acronym: APPL CATAL A-GEN

Volume number: 375

Issue number: 2

Start page: 295

End page: 302

Number of pages: 8

ISSN: 0926-860X

eISSN: 1873-3875

Languages: English-Great Britain (EN-GB)

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Abstract

Crystalline tunnel structure cryptomelane type manganese oxides (OMS-2) have been studied as photocatalysts for the selective oxidation of 2-propanol to acetone. The reaction is carried out with visible light irradiation at room temperature. The activities of various K-OMS-2 and metal doped OMS-2 (M-OMS-2) catalysts prepared by different synthesis procedures have been evaluated. K-OMS-2 and MOMS-2 (M = Fe, Ni) with nanorod morphology were the most active photocatalysts. Conversions obtained for these catalysts ranged from 50 to 15%. K-OMS-2 fibers gave only 5-6% conversion. All reactions gave 100% selectivity to acetone. The reusability of the K-OMS-2 catalyst was also tested. Characterization of K-OMS-2 catalysts was done using several techniques like temperature programmed desorption, UV-vis spectroscopy, average oxidation state analysis, XRD, BET and FE-SEM. As suggested by the photochemical and characterization data, synthesis methodology, morphology, mixed valency and the release of oxygen from the OMS-2 structure are important factors for the design of active OMS-2 photocatalysts. XRD and FTIR were also used to study structural changes in the catalyst after photolysis. (C) 2010 Elsevier B.V. All rights reserved.

Keywords

Manganese oxide octahedral molecular sieves, Oxidation, Oxygen evolution, Photocatalysis

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