Performance of LaFeO3 and La0.8Sr0.2FeO3 perovskites in Reverse Water-Gas Shift

Gal Sror; Leonid Vradman; Miron V. Landau; Moti Herskowitz

doi:10.1016/j.jece.2025.115421

Performance of LaFeO₃ and La_0.8Sr_0.2FeO₃ perovskites in Reverse Water-Gas Shift

Gal Sror, Leonid Vradman, Miron V. Landau, Moti Herskowitz

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Converting greenhouse gases to value added products is of high importance. CO₂ conversion by Reverse Water-Gas Shift (RWGS) is a promising way to produce syngas as feedstock for eFuels. Perovskites are known for their oxygen exchange ability and can be utilized as RWGS catalysts. In this study, LaFeO₃ (LF) and La_0.8Sr_0.2FeO₃ (LSF) are examined as RWGS catalysts. LSF underwent Sr exsolution leading to evolution of cationic vacancies that strongly adsorb CO₂. At sufficient H₂ concentration (H₂/CO₂>4), the adsorbed CO₂ is converted to CH₄, thus reducing the CO selectivity and consuming additional H₂. LF yielded stable CO₂ conversion with no detected CH₄ at all tested conditions (500°C-800°C, H₂/CO₂=0.3–8). Syngas with relevant ratios for eFuels synthesis (0.7 <H₂/CO<2) was obtained with LF at 700°C and 0.3 <H₂/CO₂< 1.

Original language	English
Article number	115421
Journal	Journal of Environmental Chemical Engineering
Volume	13
Issue number	2
DOIs	https://doi.org/10.1016/j.jece.2025.115421
State	Published - 1 Apr 2025

Keywords

Cationic vacancy
CO utilization
Exsolution
La-Fe Perovskites
Reverse Water-Gas Shift
Syngas

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)
Waste Management and Disposal
Pollution
Process Chemistry and Technology

Access to Document

10.1016/j.jece.2025.115421

Cite this

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title = "Performance of LaFeO3 and La0.8Sr0.2FeO3 perovskites in Reverse Water-Gas Shift",

abstract = "Converting greenhouse gases to value added products is of high importance. CO2 conversion by Reverse Water-Gas Shift (RWGS) is a promising way to produce syngas as feedstock for eFuels. Perovskites are known for their oxygen exchange ability and can be utilized as RWGS catalysts. In this study, LaFeO3 (LF) and La0.8Sr0.2FeO3 (LSF) are examined as RWGS catalysts. LSF underwent Sr exsolution leading to evolution of cationic vacancies that strongly adsorb CO2. At sufficient H2 concentration (H2/CO2>4), the adsorbed CO2 is converted to CH4, thus reducing the CO selectivity and consuming additional H2. LF yielded stable CO2 conversion with no detected CH4 at all tested conditions (500°C-800°C, H2/CO2=0.3–8). Syngas with relevant ratios for eFuels synthesis (0.7 2/CO<2) was obtained with LF at 700°C and 0.3 2/CO2< 1.",

keywords = "Cationic vacancy, CO utilization, Exsolution, La-Fe Perovskites, Reverse Water-Gas Shift, Syngas",

author = "Gal Sror and Leonid Vradman and Landau, {Miron V.} and Moti Herskowitz",

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AU - Sror, Gal

AU - Vradman, Leonid

AU - Landau, Miron V.

AU - Herskowitz, Moti

PY - 2025/4/1

Y1 - 2025/4/1

N2 - Converting greenhouse gases to value added products is of high importance. CO2 conversion by Reverse Water-Gas Shift (RWGS) is a promising way to produce syngas as feedstock for eFuels. Perovskites are known for their oxygen exchange ability and can be utilized as RWGS catalysts. In this study, LaFeO3 (LF) and La0.8Sr0.2FeO3 (LSF) are examined as RWGS catalysts. LSF underwent Sr exsolution leading to evolution of cationic vacancies that strongly adsorb CO2. At sufficient H2 concentration (H2/CO2>4), the adsorbed CO2 is converted to CH4, thus reducing the CO selectivity and consuming additional H2. LF yielded stable CO2 conversion with no detected CH4 at all tested conditions (500°C-800°C, H2/CO2=0.3–8). Syngas with relevant ratios for eFuels synthesis (0.7 2/CO<2) was obtained with LF at 700°C and 0.3 2/CO2< 1.

AB - Converting greenhouse gases to value added products is of high importance. CO2 conversion by Reverse Water-Gas Shift (RWGS) is a promising way to produce syngas as feedstock for eFuels. Perovskites are known for their oxygen exchange ability and can be utilized as RWGS catalysts. In this study, LaFeO3 (LF) and La0.8Sr0.2FeO3 (LSF) are examined as RWGS catalysts. LSF underwent Sr exsolution leading to evolution of cationic vacancies that strongly adsorb CO2. At sufficient H2 concentration (H2/CO2>4), the adsorbed CO2 is converted to CH4, thus reducing the CO selectivity and consuming additional H2. LF yielded stable CO2 conversion with no detected CH4 at all tested conditions (500°C-800°C, H2/CO2=0.3–8). Syngas with relevant ratios for eFuels synthesis (0.7 2/CO<2) was obtained with LF at 700°C and 0.3 2/CO2< 1.

KW - Cationic vacancy

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KW - La-Fe Perovskites

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