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Spectroscopic and kinetic insights of Pt-dispersion over microwave-synthesized GO-supported Pt-TiO2 for CO oxidation

Jain, Noopur and Ravishankar, N and Madras, Giridhar (2017) Spectroscopic and kinetic insights of Pt-dispersion over microwave-synthesized GO-supported Pt-TiO2 for CO oxidation. In: MOLECULAR CATALYSIS, 432 . pp. 88-98.

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Official URL: http://dx.doi.org/10.1016/j.mcat.2017.01.014

Abstract

This study explores the effect of Pt and TiO2 dispersion on the catalytic activity and analyzes the kinetics of CO oxidation over a novel catalyst consisting of ultrafine Pt-particles decorated on GO-supported TiO2. Its catalytic activity is compared with catalysts synthesized by decorating Pt nanoparticles on (i) TiO2 (Aeroxide, P25), and TiO2 prepared by using (ii) sol-gel (TiO2-SG) and (iii) microwave techniques (TiO2-MW). A 99.9% conversion of CO to CO2 is observed at 150 degrees C on Pt-TiO2-GO, while it occurs at significantly higher temperatures over other catalysts. Detailed characterization of the catalysts using XRD, TEM, TGA, ICP-MS and BET suggests that this enhanced catalytic activity is because of the uniform dispersion of Pt-TiO2 nanoparticles on the high surface area GO sheets. A combination of DRIFTS and CO-TPD is used to develop a catalytic reaction pathway and is supported by a kinetic model. This study establishes that ensuring a uniform support and noble metal dispersion can be used to develop highly active catalysts. (C) 2017 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 03 Jun 2017 09:38
Last Modified: 23 Oct 2018 14:50
URI: http://eprints.iisc.ac.in/id/eprint/57100

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