Spectroscopic and kinetic insights into the methane reforming over Ce-pyrochlores

Jain, D and Saha, S (2020) Spectroscopic and kinetic insights into the methane reforming over Ce-pyrochlores. In: Molecular Catalysis, 492 .

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Abstract

High thermal stability and oxygen conductivity of pyrochlores makes them a potential catalyst for the dry reforming of methane (DRM). In this study, noble metal (Pt, Ru) substituted Ce2Zr2O7 and Ce2Ti2O7 pyrochlores have been synthesized by modified Pechini method. The effect of variation of dopant concentration and position was examined to achieve strong metal-support interaction. Ce2Zr1.96Pt0.04O7-δ exhibited the best catalytic activity towards DRM and hence, been studied for partial oxidation (POM) and autothermal reforming of methane (ATR). Syngas ratio (H2/CO) was tuned by varying the O2 concentration in the feed. Insights obtained from both ex-situ and in situ characterization were exploited to discern the reaction mechanism. The surface intermediates were examined by DRIFTS on Ce2Zr1.96Pt0.04O7-δ for DRM, POM and ATR. Besides adsorbed CH4 and CO on Pt, the presence of carbonate and formate species were also identified. Thus, a dual-site mechanism via carbonate and formate formation was proposed for DRM over Ce2Zr1.96Pt0.04O7-δ. © 2020 Elsevier B.V.

Item Type:	Journal Article
Publication:	Molecular Catalysis
Publisher:	Elsevier B.V.
Additional Information:	Copy right for this article belongs to Elsevier B.V.
Keywords:	DRIFTSMethane reformingKineticsPyrochloresSurface chemistry
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	04 Nov 2020 09:59
Last Modified:	04 Nov 2020 09:59
URI:	http://eprints.iisc.ac.in/id/eprint/65845

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