Phase & morphology engineered surface reducibility of MnO2 nano-heterostructures: Implications on catalytic activity towards CO oxidation

Jain, Noopur and Roy, Ahin (2020) Phase & morphology engineered surface reducibility of MnO2 nano-heterostructures: Implications on catalytic activity towards CO oxidation. In: MATERIALS RESEARCH BULLETIN, 121 .

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Abstract

An understanding of the surface reducibility of a catalytically active oxide support is a pre-requisite to understanding its catalytic behavior. In this work, we report that through a stringent control over the phase and morphology of catalytically active MnO2 supports, a control over the surface reducibility can be achieved. Through temperature-programmed reduction (TPR), we prove a higher availability of lattice oxygen for the alpha-MnO2 phase, compared to that of beta-MnO2. Furthermore, by modifying the synthesis method, we could engineer the morphology of the alpha-phase into nanoflowers which in turn leads to a higher surface area, further enhancing the activity. On the engineered support, decoration of Pt nanoparticles can lower the full conversion temperature for CO oxidation at a considerably low temperature.

Item Type:	Journal Article
Publication:	MATERIALS RESEARCH BULLETIN
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	copy riht of this article belong to PERGAMON-ELSEVIER SCIENCE LTD
Keywords:	Phase; Morphology; MnO2; CO oxidation; Surface reducibility
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	10 Dec 2019 05:03
Last Modified:	10 Dec 2019 05:03
URI:	http://eprints.iisc.ac.in/id/eprint/63914

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