Elsevier

Catalysis Communications

Volume 149, 15 January 2021, 106216
Catalysis Communications

Short communication
Iron catalysts supported on nitrogen functionalized carbon for improved CO2 hydrogenation performance

https://doi.org/10.1016/j.catcom.2020.106216Get rights and content
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Highlights

  • Ethylene diamine as a nitrogen source was applied to regulate carbon support.

  • Nitrogen incorporation contributes to good dispersion of active phase.

  • Nitrogen incorporation also leads to the formation of small-size carbides.

  • Modified by N-atom and K boosts the selectivity of higher olefin-rich hydrocarbon.

Abstract

Preparation of highly efficient Fe-based catalysts is a reliable and achievable goal for catalyzing CO2 hydrogenation. Herein, ethylene diamine as a benign modifier well regulates the surface properties of carbon support, achieving a good dispersion of active small-size iron carbide sites. With the further incorporation of alkaline K promoter, heavy hydrocarbon selectivity (C5+) is increased from 14.8% to 39.8%. Combining several catalyst characterization (XRD, CO2-TPD, H2-TPR, TEM, and XPS) and reaction data, discloses that good dispersion, enhanced reduction/carburization behavior, and small-size carbides formation are essential for improving CO2 performance. Simultaneous doping of nitrogen atoms and alkali metal provides a promising means for CO2 fixation and rational design of functionalized metal-supported carbon catalysts.

Keywords

Nitrogen incorporation
CO2 hydrogenation
Carbon materials
Fe-based catalyst
Alkaline promoter

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