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Ni–Fe and Co–Fe binary oxides derived from layered double hydroxides and their catalytic evaluation for hydrogen production

Paper ID Volume ID Publish Year Pages File Format Full-Text
53927 46989 2015 11 PDF Available
Title
Ni–Fe and Co–Fe binary oxides derived from layered double hydroxides and their catalytic evaluation for hydrogen production
Abstract

•Co–Fe and Ni–Fe synthesized from layered double hydroxides (LDH) with distinct Ni/Fe and Co/Ni ratios.•Calcination produced NiFe2O4 and CoFe2O4 coexisting with α-Fe2O3, γ-Fe2O3, Co3O4 and NiO monoxides.•Solids possessing porosity within micro-to-meso pores range, with some samples displaying macropores.•Catalytic evaluation in the dry reforming of methane formed in situ Co°/CoFe2O4 and Ni°/NiFe2O4 phases.•Elevated resistance to coking showed by CoFe series is particularly remarkable, however, sintering effects were observed over these solids.

Binary oxides based on Co–Fe and Ni–Fe were synthesized thermal treatment of layered double hydroxides (LDH) having distinct Ni/Fe and Co/Ni ratios. The solids were characterized through X-ray diffraction (XRD), Raman and Mössbauer spectroscopy, nitrogen adsorption–desorption isotherms, thermoprogrammed reduction (TPR) and thermoprogrammed desorption of CO2 (TPD-CO2), scanning electron microscopy (SEM) and evaluated in dry reforming of methane. XRD results revealed the spinel oxides such as NiFe2O4 and CoFe2O4 coexisting with γ-Fe2O3, α-Fe2O3, Co3O4 and NiO monoxides. These phases were confirmed by Raman and Mössbauer spectroscopy. Nitrogen adsorption–desorption isotherms showed a porosity within micro-to-meso pores range, with some samples displaying macropores. Catalytic evaluation in the dry reforming of methane by varying the temperature in the 650 and 750 °C range suggested in situ Co°/CoFe2O4 and Ni°/NiFe2O4 phases formation, which gives best results with the temperature increment, resulting in H2/CO ratios close to 1. The elevated resistance to coking showed by Co–Fe series is particularly remarkable, however, sintering effects were observed over these solids.

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Keywords
Spinel oxides; Hydrotalcites; Dry reforming; Methane; Characterizations
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Ni–Fe and Co–Fe binary oxides derived from layered double hydroxides and their catalytic evaluation for hydrogen production
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 250, 15 July 2015, Pages 155–165
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us