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

Paper ID Volume ID Publish Year Pages File Format Full-Text
42485 45927 2010 8 PDF Available
Title
Nanoscale manganese oxide octahedral molecular sieves (OMS-2) as efficient photocatalysts in 2-propanol oxidation
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 M-OMS-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.

Graphical abstractOMS-2 is used as a photocatalyst for the oxidation of 2-propanol to acetone. The photocatalytic activity of OMS-2 materials prepared by different synthesis procedures is compared. Significant differences were found in conversion using different morphologies of OMS-2 under same reaction conditions. The characterization of catalysts is done using TPD, UV–vis, AOS, XRD, BET and FE-SEM. Catalysts were characterized before and after reactions using XRD and FTIR.Figure optionsDownload full-size imageDownload high-quality image (74 K)Download as PowerPoint slide

Keywords
Photocatalysis; Oxidation; Manganese oxide octahedral molecular sieves; Oxygen evolution
First Page Preview
Nanoscale manganese oxide octahedral molecular sieves (OMS-2) as efficient photocatalysts in 2-propanol oxidation
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 375, Issue 2, 1 March 2010, Pages 295–302
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis