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

Rahat Javaid and Tetsuya Nanba
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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

Energies, 2022, vol. 15, issue 10, 1-8

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.

Keywords: ammonia synthesis; catalyst stability; Cs promoter; MgO support; Ru catalyst (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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