Roy, Mouni and Basak, Somjyoti and Naskar, Milan Kanti (2016) Bi-template assisted synthesis of mesoporous manganese oxide nanostructures: Tuning properties for efficient CO oxidation. Physical Chemistry Chemical Physics, 18 (7). pp. 5253-5263. ISSN 1463-9076

PDF - Published Version Restricted to Registered users only Download (2889Kb) | Request a copy

Abstract

A simple soft bi-templating process was used for the synthesis of mesoporous manganese oxide nanostructures using KMnO4 as a precursor and polyethylene glycol and cetyltrimethylammonium bromide as templates in the presence of benzaldehyde as an organic additive in alkaline media, followed by calcination at 400 degrees C. X-ray diffraction and Raman spectroscopic analysis of the calcined products confirmed the existence of stoichiometric (MnO2 and Mn5O8) and non-stoichiometric mixed phases (MnO2 + Mn5O8) of Mn oxides obtained by tuning the concentration of the additive and the synthesis time. The surface properties of the prepared Mn oxides were determined by X-ray photoelectron spectroscopy. The mesoporosity of the samples was confirmed by N-2 adsorption-desorption. Different synthetic conditions resulted in the formation of different morphologies of the Mn oxides (alpha-MnO2, Mn5O8, and alpha-MnO2 + Mn5O8), such as nanoparticles, nanorods, and nanowires. The synthesized mesoporous Mn oxide nanostructures were used for the catalytic oxidation of the harmful air pollutant carbon monoxide. The Mn5O8 nanoparticles with the highest Brunauer-Emmett-Teller surface area and the non-stoichiometric manganese oxide (alpha-MnO2 + Mn5O8) nanorods with a higher Mn3+ concentration had the best catalytic efficiency.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Sol Gel
Depositing User:	Bidhan Chaudhuri
Date Deposited:	07 Nov 2016 11:41
Last Modified:	07 Nov 2016 11:41
URI:	http://cgcri.csircentral.net/id/eprint/3661

Actions (login required)

View Item