Influences of reaction and thermal conditions on microstructural evolutions of ilmenite oxygen carriers for chemical looping combustion

Liangyong Chen; Guoqiang Wei; Kunlei Liu

doi:10.1016/j.fuproc.2021.107139

Influences of reaction and thermal conditions on microstructural evolutions of ilmenite oxygen carriers for chemical looping combustion

Liangyong Chen, Guoqiang Wei, Kunlei Liu

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

12 Scopus citations

Abstract

Ilmenite ore has been widely accepted to be a cost-effective oxygen carrier (OC) of Chemical Looping Combustion (CLC) for CO₂ capture. The focus of this study is to investigate into the influences of chemical impact, thermal variation and ageing effect on microstructure and performance evolutions of ilmenite OCs. Iron element migration, crystallinity and morphology alterations, and irreversible change of chemical composition were identified to be the major aspects responsible for gradual microstructural evolutions of Ilmenite OCs. Iron element migration from bulk materials to particle surface, occurring during the oxidation step of redox cycles, was of temperature- and O₂ concentration- dependences. A schematic diagram was developed to explain the pathways of irreversible iron migration and alteration of chemical composition in redox cycle reactions. By lowering phase interaction between Fe₂TiO₅ and TiO₂, the cycled thermal shock (due to reaction and processing in CLC) promotes the iron element concentration on OC particle surface and the ilmenite OC reactivity.

Original language	English
Article number	107139
Journal	Fuel Processing Technology
Volume	228
DOIs	https://doi.org/10.1016/j.fuproc.2021.107139
State	Published - Apr 2022

Bibliographical note

Publisher Copyright:
© 2021

Funding

This research was supported by National Key R&D Program of China (No. 2018YFB0605401-04 ), “Entrepreneurship & Innovation Plan” of Jiangsu Province of China (2018), and Collaborative Research Projects between Southeast University and China Pharmaceutical University (No. 2242019K3DZ08 ). The authors gratefully acknowledge Prof. Zhenshan Li at Tsinghua University, who provided ilmenite ore for this investigation. This research was supported by National Key R&D Program of China (No. 2018YFB0605401-04), ?Entrepreneurship & Innovation Plan? of Jiangsu Province of China (2018), and Collaborative Research Projects between Southeast University and China Pharmaceutical University (No. 2242019K3DZ08). The authors gratefully acknowledge Prof. Zhenshan Li at Tsinghua University, who provided ilmenite ore for this investigation.

Funders	Funder number
Jiangsu Province of China
China Pharmaceutical University	2242019K3DZ08
Tsinghua University
Indiana University-Southeast
National Key Research and Development Program of China	2018YFB0605401-04
“Entrepreneurship & Innovation Plan” of Jiangsu Province of China

Keywords

Chemical-Looping Combustion
Ilmenite oxygen carriers
Microstructural evolution
Redox cycle
Thermal conditions

ASJC Scopus subject areas

General Chemical Engineering
Fuel Technology
Energy Engineering and Power Technology

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10.1016/j.fuproc.2021.107139

Cite this

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title = "Influences of reaction and thermal conditions on microstructural evolutions of ilmenite oxygen carriers for chemical looping combustion",

abstract = "Ilmenite ore has been widely accepted to be a cost-effective oxygen carrier (OC) of Chemical Looping Combustion (CLC) for CO2 capture. The focus of this study is to investigate into the influences of chemical impact, thermal variation and ageing effect on microstructure and performance evolutions of ilmenite OCs. Iron element migration, crystallinity and morphology alterations, and irreversible change of chemical composition were identified to be the major aspects responsible for gradual microstructural evolutions of Ilmenite OCs. Iron element migration from bulk materials to particle surface, occurring during the oxidation step of redox cycles, was of temperature- and O2 concentration- dependences. A schematic diagram was developed to explain the pathways of irreversible iron migration and alteration of chemical composition in redox cycle reactions. By lowering phase interaction between Fe2TiO5 and TiO2, the cycled thermal shock (due to reaction and processing in CLC) promotes the iron element concentration on OC particle surface and the ilmenite OC reactivity.",

keywords = "Chemical-Looping Combustion, Ilmenite oxygen carriers, Microstructural evolution, Redox cycle, Thermal conditions",

author = "Liangyong Chen and Guoqiang Wei and Kunlei Liu",

note = "Publisher Copyright: {\textcopyright} 2021",

year = "2022",

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doi = "10.1016/j.fuproc.2021.107139",

language = "English",

volume = "228",

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AU - Chen, Liangyong

AU - Wei, Guoqiang

AU - Liu, Kunlei

PY - 2022/4

Y1 - 2022/4

N2 - Ilmenite ore has been widely accepted to be a cost-effective oxygen carrier (OC) of Chemical Looping Combustion (CLC) for CO2 capture. The focus of this study is to investigate into the influences of chemical impact, thermal variation and ageing effect on microstructure and performance evolutions of ilmenite OCs. Iron element migration, crystallinity and morphology alterations, and irreversible change of chemical composition were identified to be the major aspects responsible for gradual microstructural evolutions of Ilmenite OCs. Iron element migration from bulk materials to particle surface, occurring during the oxidation step of redox cycles, was of temperature- and O2 concentration- dependences. A schematic diagram was developed to explain the pathways of irreversible iron migration and alteration of chemical composition in redox cycle reactions. By lowering phase interaction between Fe2TiO5 and TiO2, the cycled thermal shock (due to reaction and processing in CLC) promotes the iron element concentration on OC particle surface and the ilmenite OC reactivity.

AB - Ilmenite ore has been widely accepted to be a cost-effective oxygen carrier (OC) of Chemical Looping Combustion (CLC) for CO2 capture. The focus of this study is to investigate into the influences of chemical impact, thermal variation and ageing effect on microstructure and performance evolutions of ilmenite OCs. Iron element migration, crystallinity and morphology alterations, and irreversible change of chemical composition were identified to be the major aspects responsible for gradual microstructural evolutions of Ilmenite OCs. Iron element migration from bulk materials to particle surface, occurring during the oxidation step of redox cycles, was of temperature- and O2 concentration- dependences. A schematic diagram was developed to explain the pathways of irreversible iron migration and alteration of chemical composition in redox cycle reactions. By lowering phase interaction between Fe2TiO5 and TiO2, the cycled thermal shock (due to reaction and processing in CLC) promotes the iron element concentration on OC particle surface and the ilmenite OC reactivity.

KW - Chemical-Looping Combustion

KW - Ilmenite oxygen carriers

KW - Microstructural evolution

KW - Redox cycle

KW - Thermal conditions

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Influences of reaction and thermal conditions on microstructural evolutions of ilmenite oxygen carriers for chemical looping combustion

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

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