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Achieving volatile potassium promoted ammonia synthesis via mechanochemistry.

ABSTRACT: Potassium oxide (K₂O) is used as a promotor in industrial ammonia synthesis, although metallic potassium (K) is better in theory. The reason K₂O is used is because metallic K, which volatilizes around 400 °C, separates from the catalyst in the harsh ammonia synthesis conditions of the Haber-Bosch process. To maximize the efficiency of ammonia synthesis, using metallic K with low temperature reaction below 400 °C is prerequisite. Here, we synthesize ammonia using metallic K and Fe as a catalyst via mechanochemical process near ambient conditions (45 °C, 1 bar). The final ammonia concentration reaches as high as 94.5 vol%, which was extraordinarily higher than that of the Haber-Bosch process (25.0 vol%, 450 °C, 200 bar) and our previous work (82.5 vol%, 45 °C, 1 bar).

SUBMITTER: Kim JH

PROVIDER: S-EPMC10122650 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature

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Achieving volatile potassium promoted ammonia synthesis via mechanochemistry.

Kim Jong-Hoon JH Dai Tian-Yi TY Yang Mihyun M Seo Jeong-Min JM Lee Jae Seong JS Kweon Do Hyung DH Lang Xing-You XY Ihm Kyuwook K Shin Tae Joo TJ Han Gao-Feng GF Jiang Qing Q Baek Jong-Beom JB

Nature communications 20230422 1

Potassium oxide (K<sub>2</sub>O) is used as a promotor in industrial ammonia synthesis, although metallic potassium (K) is better in theory. The reason K<sub>2</sub>O is used is because metallic K, which volatilizes around 400 °C, separates from the catalyst in the harsh ammonia synthesis conditions of the Haber-Bosch process. To maximize the efficiency of ammonia synthesis, using metallic K with low temperature reaction below 400 °C is prerequisite. Here, we synthesize ammonia using metallic K ...[more]

PMID: 37087491

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