双金属片
催化作用
产量(工程)
碳氢化合物
选择性
氧化物
材料科学
金属
氧气
化学工程
化学
无机化学
有机化学
冶金
工程类
作者
Sheraz Ahmed,Muhammad Irshad,Wonjoong Yoon,Neha Karanwal,Junjung Rohmat Sugiarto,Muhammad Kashif Iqbal Khan,S. KIM,Jaehoon Kim
标识
DOI:10.1016/j.apcatb.2023.123052
摘要
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.
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