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Published in: Journal of Materials Science 4/2022

03-01-2022 | Energy materials

Ni/CexZr1-xO2 catalyst prepared via one-step co-precipitation for CO2 reforming of CH4 to produce syngas: role of oxygen storage capacity (OSC) and oxygen vacancy formation energy (OVFE)

Authors: Manohar Prasad, Koustuv Ray, Apurba Sinhamahapatra, Siddhartha Sengupta

Published in: Journal of Materials Science | Issue 4/2022

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Abstract

Ceria-zirconia solid solution (Ce0.5Zr0.5O2)-supported Ni catalyst (15 wt. %) is prepared by one-step co-precipitation followed by calcination reduction for CO2 reforming of CH4 (DRM). Oxygen storage capacity (OSC) is measured by O2 pulse injection at the reaction temperature. The solid solution is formed upon incorporating Zr4+ into ceria, subsequently accelerating oxygen mobility from lattice (bulk) to the surface, enhancing %Ce3+ due to increased oxygen vacancies, and thus improving OSC, reducibility, surface basicity, and Ni dispersion compared to pure CeO2 and ZrO2. The solid solution exhibits better conversions of CH4 and CO2, a higher H2/CO ratio, and low carbon deposition compared to its pure counterpart. The density functional theory (DFT) studies unveil oxygen vacancy formation energy (OVFE) as a descriptor that decreased for Ce0.5Zr0.5O2 due to the incorporation of Zr4+ and enhanced mobility of O anions, OSC, and reducibility.

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Appendix
Available only for authorised users
Literature
52.
go back to reference Montoya JA, Romero-pascual E, Gimon C et al (2000) Methane reforming with CO2 over Ni / ZrO2–CeO2 catalysts prepared by sol—gel. Catal Today 63:71–85CrossRef Montoya JA, Romero-pascual E, Gimon C et al (2000) Methane reforming with CO2 over Ni / ZrO2–CeO2 catalysts prepared by sol—gel. Catal Today 63:71–85CrossRef
Metadata
Title
Ni/CexZr1-xO2 catalyst prepared via one-step co-precipitation for CO2 reforming of CH4 to produce syngas: role of oxygen storage capacity (OSC) and oxygen vacancy formation energy (OVFE)
Authors
Manohar Prasad
Koustuv Ray
Apurba Sinhamahapatra
Siddhartha Sengupta
Publication date
03-01-2022
Publisher
Springer US
Published in
Journal of Materials Science / Issue 4/2022
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-021-06720-5

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