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La0.75Sr0.25XO3 (X = Fe, Mn or Cr) with coking tolerance for CH4/H2O reaction: Effect of H2S on catalytic performance

Abstract

The influence of B type cation from the ABO3 perovskite formulation La0.75Sr0.25XO3 (LSX, where X is Fe, Mn or Cr) on the C and H2S tolerance and its catalytic activity for methane/water reaction has been studied. The samples were prepared by a simple and cost-efficient citrate method. The exhaustive characterization of the bulk and surface properties of the catalysts has been accomplished by means of complementary methods: nitrogen adsorption-desorption isotherms, XRD, TPR and XPS. Their catalytic properties in CH4/H2O reactions (CH4/H2O molar ratios of 10 and 1) were studied in presence and absence of H2S in order to evaluate their potential use as anode material in solid oxide fuel cells operated on natural gas. Before addition and upon suppression of H2S the activity varied in the following order: LSF>LSM>>LSC. This correlates with the oxygen mobility determined by TPR. A strong promoting effect of H2S on the catalytic activity is observed for LSC, which makes this sample the most active of the series, while H2S has a weak influence on the other perovskites. The oxygen vacancies and the presence of S2- were identified as being responsible for the enhanced catalytic activity upon H2S addition.

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Publication details

The article was received on 10 Jan 2019, accepted on 03 Apr 2019 and first published on 09 Apr 2019


Article type: Paper
DOI: 10.1039/C9CY00065H
Citation: Catal. Sci. Technol., 2019, Accepted Manuscript

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    La0.75Sr0.25XO3 (X = Fe, Mn or Cr) with coking tolerance for CH4/H2O reaction: Effect of H2S on catalytic performance

    M. Florea, S. Somacescu, G. Postole, A. Urda, F. Neatu, S. Neatu, L. massin and P. Gelin, Catal. Sci. Technol., 2019, Accepted Manuscript , DOI: 10.1039/C9CY00065H

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