Effect of Potassium Doping on the Surface Structure and Ammonia Synthesis Activity of Co/MgO

The development of effective catalysts for ammonia synthesis under mild conditions is crucial for the mitigation of global warming. Recently, supported Co catalysts have been of great interest, and it is important to investigate the doping effects of basic promoters, such as potassium (K), having strong electron-donating properties. Here we show that even a small amount of K doping (K/(K + Mg) = 0.5-1 mol %) to Co/MgO increases the ammonia synthesis rate of Co/MgO by twice. Moreover, our results revealed that the reduction conditions, such as the temperature and time, strongly affect the amount, chemical state, and arrangement of K species, thereby significantly impacting the NH<sub>3</sub> synthesis activity. The findings of this research will contribute to understanding of the effect of alkaline promoters on Co catalysts used for various reactions.

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Publication Details

Journal
ACS Omega
Published
2025-11-03
DOI
https://doi.org/10.1021/acsomega.5c07671
Primary Topic
Ammonia Synthesis and Nitrogen Reduction
Type
article
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article

Effect of Potassium Doping on the Surface Structure and Ammonia Synthesis Activity of Co/MgO

Tomoko Shibata, Tomokazu Yamamoto, Koji Inazu, Katsutoshi Sato et al.
ACS Omega
Ammonia Synthesis and Nitrogen Reduction
article

Effect of Potassium Doping on the Surface Structure and Ammonia Synthesis Activity of Co/MgO

Tomoko Shibata, Tomokazu Yamamoto, Koji Inazu, Katsutoshi Sato, Kanishka De Silva, K. Era, Yasukazu Murakami, Shin‐ichiro Miyahara, Katsutoshi Nagaoka, Takehiro Tamaoka, Takaaki Toriyama, T. Naito, Hiroshi Yamada
article en

Abstract

The development of effective catalysts for ammonia synthesis under mild conditions is crucial for the mitigation of global warming. Recently, supported Co catalysts have been of great interest, and it is important to investigate the doping effects of basic promoters, such as potassium (K), having strong electron-donating properties. Here we show that even a small amount of K doping (K/(K + Mg) = 0.5-1 mol %) to Co/MgO increases the ammonia synthesis rate of Co/MgO by twice. Moreover, our results revealed that the reduction conditions, such as the temperature and time, strongly affect the amount, chemical state, and arrangement of K species, thereby significantly impacting the NH<sub>3</sub> synthesis activity. The findings of this research will contribute to understanding of the effect of alkaline promoters on Co catalysts used for various reactions.

ACS OmegaVol. 10(44)
Kyushu University (JP), National Institute of Technology, Numazu College (JP), Nagoya University (JP)
Openalex Percentile: Top 80%
Ammonia Synthesis and Nitrogen Reduction
DOIOpen Access PDFOpenAlex
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Effect of Potassium Doping on the Surface Structure and Ammonia Synthesis Activity of Co/MgO — Tomoko Shibata, Tomokazu Yamamoto, et al. · ACS Omega (2025) | TGRS Research Map | TGRS