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Stability of Cs/Ru/MgO Catalyst for Ammonia Synthesis as a Hydrogen and Energy Carrier

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  • Rahat Javaid

    (Renewable Energy Research Center, Fukushima Renewable Energy Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2-2-9 Machiikedai, Koriyama 963-0298, Fukushima, Japan)

  • Tetsuya Nanba

    (Renewable Energy Research Center, Fukushima Renewable Energy Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2-2-9 Machiikedai, Koriyama 963-0298, Fukushima, Japan)

Abstract

The Cs/Ru/MgO catalyst was synthesized by sequential impregnation of Ru and Cs on MgO support using Ru(NO 3 ) 3 and CsNO 3 precursors. Catalytic ammonia synthesis was carried out in a fixed-bed flow reactor using H 2 and N 2 as reactants. The stability of the catalyst was measured at 350 °C, 2.5 MPa gauge pressure, and SV as 1200 h −1 using the H 2 /N 2 ratio 3 as a reactant feedstock. The Cs/Ru/MgO catalyst retained its ammonia synthesis activity while conducting experiments at mild reaction conditions of 325 °C and 350 °C. An increase in experimental temperature to 375–425 °C decreased the ammonia synthesis activity retaining only to 42% of the initial activity after 680 h of time on stream. The deformation of the catalyst’s structure, which was caused by Cs leaching and redistribution of the Ru and increased crystallinity of MgO at high-temperature conditions, was considered the plausible reason for the drastic decrease in ammonia synthesis activity.

Suggested Citation

  • Rahat Javaid & Tetsuya Nanba, 2022. "Stability of Cs/Ru/MgO Catalyst for Ammonia Synthesis as a Hydrogen and Energy Carrier," Energies, MDPI, vol. 15(10), pages 1-8, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3506-:d:812977
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    References listed on IDEAS

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    1. Miura, Daisuke & Tezuka, Tetsuo, 2014. "A comparative study of ammonia energy systems as a future energy carrier, with particular reference to vehicle use in Japan," Energy, Elsevier, vol. 68(C), pages 428-436.
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