Evaluation of MgO as a promoter for the hydrogenation of CO2 to long-chain hydrocarbons over Fe-based catalysts

Sheraz Ahmed; Muhammad Irshad; Wonjoong Yoon; Neha Karanwal; Junjung Rohmat Sugiarto; Muhammad Kashif Khan; Soek Ki Kim; Jaehoon Kim

doi:10.1016/j.apcatb.2023.123052

Evaluation of MgO as a promoter for the hydrogenation of CO₂ to long-chain hydrocarbons over Fe-based catalysts

Sheraz Ahmed, Muhammad Irshad, Wonjoong Yoon, Neha Karanwal, Junjung Rohmat Sugiarto, Muhammad Kashif Khan, Soek Ki Kim, Jaehoon Kim

Department of Mechanical Engineering

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

100 Scopus citations

Abstract

Thermocatalytic conversion of CO₂ into liquid fuels and chemicals is a promising approach to mitigate global warming. Although, the CO₂ conversion and long-chain hydrocarbon selectivity are highly dependent on the choice of metal-oxide promoter, but role of the promoter remains unclear. Herein, the role of MgO as a promoter for an Fe-based catalyst was investigated. Bimetallic Na-FeMgO_x catalyst exhibited a high C₅₊ yield of 25.1% with a CO₂ conversion of 49.1% at the early stage of the reaction. The presence of MgO facilitates the reduction of Fe oxides and formation of oxygen vacancies by transferring electrons to Fe-based phases. In addition, at the early stage of reaction, the decoration of the Mg oxide surface with nanosized χ-Fe₅C₂ enhances the C₅₊ yield. However, the progressive transformation of MgO to MgCO₃ during CO₂ conversion deactivates the Na-FeMgO_x catalyst. A detailed deactivation mechanism is also discussed.

Original language	English
Article number	123052
Journal	Applied Catalysis B: Environmental
Volume	338
DOIs	https://doi.org/10.1016/j.apcatb.2023.123052
State	Published - 5 Dec 2023

Keywords

CO hydrogenation
Deactivation
Fe catalyst
Fischer–Tropsch synthesis
Mg promotor

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.apcatb.2023.123052

Cite this

@article{9c55ce68d2f540c38faa85fcdec9c414,

title = "Evaluation of MgO as a promoter for the hydrogenation of CO2 to long-chain hydrocarbons over Fe-based catalysts",

abstract = "Thermocatalytic conversion of CO2 into liquid fuels and chemicals is a promising approach to mitigate global warming. Although, the CO2 conversion and long-chain hydrocarbon selectivity are highly dependent on the choice of metal-oxide promoter, but role of the promoter remains unclear. Herein, the role of MgO as a promoter for an Fe-based catalyst was investigated. Bimetallic Na-FeMgOx catalyst exhibited a high C5+ yield of 25.1\% with a CO2 conversion of 49.1\% at the early stage of the reaction. The presence of MgO facilitates the reduction of Fe oxides and formation of oxygen vacancies by transferring electrons to Fe-based phases. In addition, at the early stage of reaction, the decoration of the Mg oxide surface with nanosized χ-Fe5C2 enhances the C5+ yield. However, the progressive transformation of MgO to MgCO3 during CO2 conversion deactivates the Na-FeMgOx catalyst. A detailed deactivation mechanism is also discussed.",

keywords = "CO hydrogenation, Deactivation, Fe catalyst, Fischer–Tropsch synthesis, Mg promotor",

author = "Sheraz Ahmed and Muhammad Irshad and Wonjoong Yoon and Neha Karanwal and Sugiarto, \{Junjung Rohmat\} and Khan, \{Muhammad Kashif\} and Kim, \{Soek Ki\} and Jaehoon Kim",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

year = "2023",

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day = "5",

doi = "10.1016/j.apcatb.2023.123052",

language = "English",

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T1 - Evaluation of MgO as a promoter for the hydrogenation of CO2 to long-chain hydrocarbons over Fe-based catalysts

AU - Ahmed, Sheraz

AU - Irshad, Muhammad

AU - Yoon, Wonjoong

AU - Karanwal, Neha

AU - Sugiarto, Junjung Rohmat

AU - Khan, Muhammad Kashif

AU - Kim, Soek Ki

AU - Kim, Jaehoon

PY - 2023/12/5

Y1 - 2023/12/5

N2 - Thermocatalytic conversion of CO2 into liquid fuels and chemicals is a promising approach to mitigate global warming. Although, the CO2 conversion and long-chain hydrocarbon selectivity are highly dependent on the choice of metal-oxide promoter, but role of the promoter remains unclear. Herein, the role of MgO as a promoter for an Fe-based catalyst was investigated. Bimetallic Na-FeMgOx catalyst exhibited a high C5+ yield of 25.1% with a CO2 conversion of 49.1% at the early stage of the reaction. The presence of MgO facilitates the reduction of Fe oxides and formation of oxygen vacancies by transferring electrons to Fe-based phases. In addition, at the early stage of reaction, the decoration of the Mg oxide surface with nanosized χ-Fe5C2 enhances the C5+ yield. However, the progressive transformation of MgO to MgCO3 during CO2 conversion deactivates the Na-FeMgOx catalyst. A detailed deactivation mechanism is also discussed.

AB - Thermocatalytic conversion of CO2 into liquid fuels and chemicals is a promising approach to mitigate global warming. Although, the CO2 conversion and long-chain hydrocarbon selectivity are highly dependent on the choice of metal-oxide promoter, but role of the promoter remains unclear. Herein, the role of MgO as a promoter for an Fe-based catalyst was investigated. Bimetallic Na-FeMgOx catalyst exhibited a high C5+ yield of 25.1% with a CO2 conversion of 49.1% at the early stage of the reaction. The presence of MgO facilitates the reduction of Fe oxides and formation of oxygen vacancies by transferring electrons to Fe-based phases. In addition, at the early stage of reaction, the decoration of the Mg oxide surface with nanosized χ-Fe5C2 enhances the C5+ yield. However, the progressive transformation of MgO to MgCO3 during CO2 conversion deactivates the Na-FeMgOx catalyst. A detailed deactivation mechanism is also discussed.

KW - CO hydrogenation

KW - Deactivation

KW - Fe catalyst

KW - Fischer–Tropsch synthesis

KW - Mg promotor

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