Exsolution of Fe-Ni alloy nanoparticles from (La,Sr)(Cr,Fe,Ni)O3 perovskites as potential oxygen transport membrane catalysts for methane reforming

Despoina Papargyriou; David Noel Miller; John Thomas Sirr Irvine

doi:10.1039/c9ta03711j

Exsolution of Fe-Ni alloy nanoparticles from (La,Sr)(Cr,Fe,Ni)O₃ perovskites as potential oxygen transport membrane catalysts for methane reforming

Despoina Papargyriou, David Noel Miller, John Thomas Sirr Irvine^*

^*Corresponding author for this work

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

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Abstract

(La_0.75Sr_0.25)(Cr_0.5Fe_0.5−xNi_x)O₃ perovskites were investigated as potential catalysts for oxygen transport membranes for methane reforming applications. XRD was performed to study the structural changes that took place when Fe was partially substituted by Ni, in both oxidising and reducing environments. TGA measurements demonstrated that the oxygen deficiency of these perovskites under reducing conditions was enhanced by increasing the level of Ni doping, due to the reduction of the Fe³⁺/Fe⁴⁺ and Ni²⁺ species to lower cation valences. SEM and TEM-EDX analyses showed that upon reduction exsolution of bimetallic Fe–Ni alloy nanoparticles took place on the surface of the perovskite, which was beneficial for the catalyst's activity. The optimum stoichiometry was the (La_0.75Sr_0.25)(Cr_0.5Fe_0.35Ni_0.15)O₃ perovskite, which during catalytic testing, demonstrated 72% CH₄ conversion, which was 20 times higher than that of the initial perovskite.

Original language	English
Pages (from-to)	15812-15822
Number of pages	11
Journal	Journal of Materials Chemistry A
Volume	7
Issue number	26
Early online date	7 Jun 2019
DOIs	https://doi.org/10.1039/c9ta03711j
Publication status	Published - 14 Jul 2019

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10.1039/c9ta03711j

Papargyriou_2019_Exsolution_AAM
Copyright © 2019 The Author(s). This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/ 10.1039/C9TA03711J
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Equipment Account: Characterisation and Manipulation of Advanced Functional Materials and their Interfaces at the Nanoscale
Samuel, I. D. W. (PI)
EPSRC
1/10/13 → 30/09/23
Project: Standard
Energy Materials Discovery: Energy Materials Discovery Characterisation and Application
Irvine, J. T. S. (PI), Cassidy, M. (CoI), Connor, P. A. (CoI), Savaniu, C. D. (CoI) & Zhou, W. (CoI)
EPSRC
7/01/13 → 6/01/18
Project: Standard

Cite this

@article{68ab8ce73bbc48eda590e2719116ed19,

title = "Exsolution of Fe-Ni alloy nanoparticles from (La,Sr)(Cr,Fe,Ni)O3 perovskites as potential oxygen transport membrane catalysts for methane reforming",

abstract = "(La0.75Sr0.25)(Cr0.5Fe0.5−xNix)O3 perovskites were investigated as potential catalysts for oxygen transport membranes for methane reforming applications. XRD was performed to study the structural changes that took place when Fe was partially substituted by Ni, in both oxidising and reducing environments. TGA measurements demonstrated that the oxygen deficiency of these perovskites under reducing conditions was enhanced by increasing the level of Ni doping, due to the reduction of the Fe3+/Fe4+ and Ni2+ species to lower cation valences. SEM and TEM-EDX analyses showed that upon reduction exsolution of bimetallic Fe–Ni alloy nanoparticles took place on the surface of the perovskite, which was beneficial for the catalyst's activity. The optimum stoichiometry was the (La0.75Sr0.25)(Cr0.5Fe0.35Ni0.15)O3 perovskite, which during catalytic testing, demonstrated 72% CH4 conversion, which was 20 times higher than that of the initial perovskite.",

author = "Despoina Papargyriou and Miller, {David Noel} and Irvine, {John Thomas Sirr}",

note = "Authors acknowledge support from the EPSRC for Platform Grant EP/K015540/1 and EPSRC Capital for Great Technologies Grant EP/L017008/1.",

year = "2019",

month = jul,

day = "14",

doi = "10.1039/c9ta03711j",

language = "English",

volume = "7",

pages = "15812--15822",

journal = "Journal of Materials Chemistry A",

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T1 - Exsolution of Fe-Ni alloy nanoparticles from (La,Sr)(Cr,Fe,Ni)O3 perovskites as potential oxygen transport membrane catalysts for methane reforming

AU - Papargyriou, Despoina

AU - Miller, David Noel

AU - Irvine, John Thomas Sirr

N1 - Authors acknowledge support from the EPSRC for Platform Grant EP/K015540/1 and EPSRC Capital for Great Technologies Grant EP/L017008/1.

PY - 2019/7/14

Y1 - 2019/7/14

N2 - (La0.75Sr0.25)(Cr0.5Fe0.5−xNix)O3 perovskites were investigated as potential catalysts for oxygen transport membranes for methane reforming applications. XRD was performed to study the structural changes that took place when Fe was partially substituted by Ni, in both oxidising and reducing environments. TGA measurements demonstrated that the oxygen deficiency of these perovskites under reducing conditions was enhanced by increasing the level of Ni doping, due to the reduction of the Fe3+/Fe4+ and Ni2+ species to lower cation valences. SEM and TEM-EDX analyses showed that upon reduction exsolution of bimetallic Fe–Ni alloy nanoparticles took place on the surface of the perovskite, which was beneficial for the catalyst's activity. The optimum stoichiometry was the (La0.75Sr0.25)(Cr0.5Fe0.35Ni0.15)O3 perovskite, which during catalytic testing, demonstrated 72% CH4 conversion, which was 20 times higher than that of the initial perovskite.

AB - (La0.75Sr0.25)(Cr0.5Fe0.5−xNix)O3 perovskites were investigated as potential catalysts for oxygen transport membranes for methane reforming applications. XRD was performed to study the structural changes that took place when Fe was partially substituted by Ni, in both oxidising and reducing environments. TGA measurements demonstrated that the oxygen deficiency of these perovskites under reducing conditions was enhanced by increasing the level of Ni doping, due to the reduction of the Fe3+/Fe4+ and Ni2+ species to lower cation valences. SEM and TEM-EDX analyses showed that upon reduction exsolution of bimetallic Fe–Ni alloy nanoparticles took place on the surface of the perovskite, which was beneficial for the catalyst's activity. The optimum stoichiometry was the (La0.75Sr0.25)(Cr0.5Fe0.35Ni0.15)O3 perovskite, which during catalytic testing, demonstrated 72% CH4 conversion, which was 20 times higher than that of the initial perovskite.

U2 - 10.1039/c9ta03711j

DO - 10.1039/c9ta03711j

M3 - Article

SN - 2050-7488

VL - 7

SP - 15812

EP - 15822

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 26

ER -

Exsolution of Fe-Ni alloy nanoparticles from (La,Sr)(Cr,Fe,Ni)O3 perovskites as potential oxygen transport membrane catalysts for methane reforming

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Equipment Account: Characterisation and Manipulation of Advanced Functional Materials and their Interfaces at the Nanoscale

Energy Materials Discovery: Energy Materials Discovery Characterisation and Application

Cite this

Exsolution of Fe-Ni alloy nanoparticles from (La,Sr)(Cr,Fe,Ni)O₃ perovskites as potential oxygen transport membrane catalysts for methane reforming