CO 2 reduction and methane partial oxidation on surface catalyzed La 0.9 Ca 0.1 FeO 3-δ oxygen transport membranes

Xiao-Yu Wu; Ahmed F. Ghoniem

doi:10.1016/j.proci.2018.05.164

CO 2 reduction and methane partial oxidation on surface catalyzed La 0.9 Ca 0.1 FeO 3-δ oxygen transport membranes

Xiao-Yu Wu, Ahmed F. Ghoniem

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

10 Scopus citations

Abstract

In this paper, we demonstrate CO2 thermochemical reduction to CO in a La0.9Ca0.1FeO3-δ oxygen ion transport membrane reactor. For process intensification, we also show that methane can be used on the sweep side, producing two streams: a CO stream from CO2 reduction on the feed side, and a syngas stream on the other. We show that surface reactions are the rate-limiting steps for fuel-assisted CO2 reduction on a flat LCF-91 membrane. To improve productivity, we study how that adding catalytic porous layers can accelerate these steps and hence, increase the CO2-to-fuel conversion rates. Adding LCF-91 porous layers onto the membrane surface raised the oxygen flux by 1.4X. Secondly, different catalysts (Ce0.5Zr0.5O2 on the feed side and (La0.6Sr0.4)0.95Co0.2Fe0.8O3 on the sweep side) were added onto the porous layers to further accelerate the surface reaction rates. As a result, the oxygen flux was further increased especially at lower temperatures, e.g., at 850°C, oxygen flux was raised by one order of magnitude as compared to the unmodified membrane. Process intensification was tested on the latter membrane configuration, and the syngas produced on the sweep side had a H2:CO ratio very close to 2, ideal for production of fuels. Carbon species balance showed that higher methane concentration on the sweep side could lead to coke formation. Results also show that the selectivity to CO2 near the membrane surface is higher than that at the reactor outlet due to the availability of lattice oxygen and the favorable water-gas shift reactions.

Original language	English (US)
Pages (from-to)	5517-5524
Number of pages	8
Journal	Proceedings of the Combustion Institute
Volume	37
Issue number	4
DOIs	https://doi.org/10.1016/j.proci.2018.05.164
State	Published - Jun 21 2018
Externally published	Yes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors would like to thank Exelon Corporation, Shell and King Abdullah University of Science and Technology (KAUST) for funding the research.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

Access to Document

10.1016/j.proci.2018.05.164

Cite this

@article{ef49b0ec249241dfb9a1eb60d6781778,

title = "CO 2 reduction and methane partial oxidation on surface catalyzed La 0.9 Ca 0.1 FeO 3-δ oxygen transport membranes",

abstract = "In this paper, we demonstrate CO2 thermochemical reduction to CO in a La0.9Ca0.1FeO3-δ oxygen ion transport membrane reactor. For process intensification, we also show that methane can be used on the sweep side, producing two streams: a CO stream from CO2 reduction on the feed side, and a syngas stream on the other. We show that surface reactions are the rate-limiting steps for fuel-assisted CO2 reduction on a flat LCF-91 membrane. To improve productivity, we study how that adding catalytic porous layers can accelerate these steps and hence, increase the CO2-to-fuel conversion rates. Adding LCF-91 porous layers onto the membrane surface raised the oxygen flux by 1.4X. Secondly, different catalysts (Ce0.5Zr0.5O2 on the feed side and (La0.6Sr0.4)0.95Co0.2Fe0.8O3 on the sweep side) were added onto the porous layers to further accelerate the surface reaction rates. As a result, the oxygen flux was further increased especially at lower temperatures, e.g., at 850°C, oxygen flux was raised by one order of magnitude as compared to the unmodified membrane. Process intensification was tested on the latter membrane configuration, and the syngas produced on the sweep side had a H2:CO ratio very close to 2, ideal for production of fuels. Carbon species balance showed that higher methane concentration on the sweep side could lead to coke formation. Results also show that the selectivity to CO2 near the membrane surface is higher than that at the reactor outlet due to the availability of lattice oxygen and the favorable water-gas shift reactions.",

author = "Xiao-Yu Wu and Ghoniem, {Ahmed F.}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: The authors would like to thank Exelon Corporation, Shell and King Abdullah University of Science and Technology (KAUST) for funding the research. This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

year = "2018",

month = jun,

day = "21",

doi = "10.1016/j.proci.2018.05.164",

language = "English (US)",

volume = "37",

pages = "5517--5524",

journal = "Proceedings of the Combustion Institute",

issn = "1540-7489",

publisher = "Elsevier",

number = "4",

}

TY - JOUR

T1 - CO 2 reduction and methane partial oxidation on surface catalyzed La 0.9 Ca 0.1 FeO 3-δ oxygen transport membranes

AU - Wu, Xiao-Yu

AU - Ghoniem, Ahmed F.

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: The authors would like to thank Exelon Corporation, Shell and King Abdullah University of Science and Technology (KAUST) for funding the research. This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2018/6/21

Y1 - 2018/6/21

N2 - In this paper, we demonstrate CO2 thermochemical reduction to CO in a La0.9Ca0.1FeO3-δ oxygen ion transport membrane reactor. For process intensification, we also show that methane can be used on the sweep side, producing two streams: a CO stream from CO2 reduction on the feed side, and a syngas stream on the other. We show that surface reactions are the rate-limiting steps for fuel-assisted CO2 reduction on a flat LCF-91 membrane. To improve productivity, we study how that adding catalytic porous layers can accelerate these steps and hence, increase the CO2-to-fuel conversion rates. Adding LCF-91 porous layers onto the membrane surface raised the oxygen flux by 1.4X. Secondly, different catalysts (Ce0.5Zr0.5O2 on the feed side and (La0.6Sr0.4)0.95Co0.2Fe0.8O3 on the sweep side) were added onto the porous layers to further accelerate the surface reaction rates. As a result, the oxygen flux was further increased especially at lower temperatures, e.g., at 850°C, oxygen flux was raised by one order of magnitude as compared to the unmodified membrane. Process intensification was tested on the latter membrane configuration, and the syngas produced on the sweep side had a H2:CO ratio very close to 2, ideal for production of fuels. Carbon species balance showed that higher methane concentration on the sweep side could lead to coke formation. Results also show that the selectivity to CO2 near the membrane surface is higher than that at the reactor outlet due to the availability of lattice oxygen and the favorable water-gas shift reactions.

AB - In this paper, we demonstrate CO2 thermochemical reduction to CO in a La0.9Ca0.1FeO3-δ oxygen ion transport membrane reactor. For process intensification, we also show that methane can be used on the sweep side, producing two streams: a CO stream from CO2 reduction on the feed side, and a syngas stream on the other. We show that surface reactions are the rate-limiting steps for fuel-assisted CO2 reduction on a flat LCF-91 membrane. To improve productivity, we study how that adding catalytic porous layers can accelerate these steps and hence, increase the CO2-to-fuel conversion rates. Adding LCF-91 porous layers onto the membrane surface raised the oxygen flux by 1.4X. Secondly, different catalysts (Ce0.5Zr0.5O2 on the feed side and (La0.6Sr0.4)0.95Co0.2Fe0.8O3 on the sweep side) were added onto the porous layers to further accelerate the surface reaction rates. As a result, the oxygen flux was further increased especially at lower temperatures, e.g., at 850°C, oxygen flux was raised by one order of magnitude as compared to the unmodified membrane. Process intensification was tested on the latter membrane configuration, and the syngas produced on the sweep side had a H2:CO ratio very close to 2, ideal for production of fuels. Carbon species balance showed that higher methane concentration on the sweep side could lead to coke formation. Results also show that the selectivity to CO2 near the membrane surface is higher than that at the reactor outlet due to the availability of lattice oxygen and the favorable water-gas shift reactions.

UR - http://hdl.handle.net/10754/629793

UR - https://linkinghub.elsevier.com/retrieve/pii/S1540748918301706

UR - http://www.scopus.com/inward/record.url?scp=85048711185&partnerID=8YFLogxK

U2 - 10.1016/j.proci.2018.05.164

DO - 10.1016/j.proci.2018.05.164

M3 - Article

SN - 1540-7489

VL - 37

SP - 5517

EP - 5524

JO - Proceedings of the Combustion Institute

JF - Proceedings of the Combustion Institute

IS - 4

ER -

CO 2 reduction and methane partial oxidation on surface catalyzed La 0.9 Ca 0.1 FeO 3-δ oxygen transport membranes

Abstract

Bibliographical note

Access to Document

Other files and links

Fingerprint

Cite this