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Mechanistic Insights and Kinetics of CO Oxidation over Pristine and Noble Metal Modified Fe2O3 Using Diffuse Reflectance Infrared Fourier Transform Spectroscopy

Jain, Disha and Madras, Giridhar (2017) Mechanistic Insights and Kinetics of CO Oxidation over Pristine and Noble Metal Modified Fe2O3 Using Diffuse Reflectance Infrared Fourier Transform Spectroscopy. In: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 56 (8). pp. 2008-2024.

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Official URL: http://dx.doi.org/10.1021/acs.iecr.6b04856

Abstract

Fe2O3 is an attractive catalyst for CO oxidation because of its low cost and reducible nature. Modification in reducible oxide by a noble metal enhances its reducibility. In this work, the effect of noble metal (NM: Pt,Pd) impregnation and substitution on the reaction mechanism for CO oxidation has been studied. Detailed ex situ (X-ray diffraction, XRD; Xray photoelectron spectroscopy, XPS; and transmission electron microscopy, TEM) and in situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) characterization were performed along with kinetic studies to develop mechanistic models. Remarkably, the Fe2O3-supported NM exhibited superior catalytic activity than the NM-substituted Fe2O3. Consequently, XPS, photoluminescence, and DRIFTS studies were performed to understand this behavior. Fe2O3 supported NM showed the formation of metal carbonyl bands in DRIFTS studies, however, carbonates were only observed over Fe2O3-supported Pt. On the basis of the spectroscopic evidence and kinetic studies, the Eley-Rideal mechanism was proposed for pristine Fe2O3, whereas noncompetitive and competitive Langmuir-Hinshelwood mechanisms were proposed for Fe(2)O(3-)supported Pt and Pd, respectively.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 19 May 2017 10:32
Last Modified: 19 May 2017 10:32
URI: http://eprints.iisc.ac.in/id/eprint/56674

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