Morlanes, Natalia Sanchez
Katikaneni, Sai P.
KAUST DepartmentChemical Engineering Program
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/664971
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AbstractPotassium-promoted ruthenium supported on CaO is a very efficient catalyst for ammonia decomposition, surpassing the performance of other Ru-supported solids. At an optimum Ru loading of 3% wt, catalysts with a K/Ru atomic ratio of 0.9 showed the best catalytic performance under a wide range of operating conditions, P = 1-40 bar, T = 250-550 °C and WHSV = 9000-30 000 mL g-1 h-1. Although NH3 conversion levels decrease considerably upon increasing the reaction pressure (X550 °C, 40 bar = 0.8), high pressure ammonia decomposition offers the possibility of COx-free compressed hydrogen and hydrogen productivities and TOFs 40 times bigger than when applying atmospheric pressure. Extensive characterization by CO chemisorption and HR-TEM demonstrates that potassium promotion increases metal dispersion by decreasing the Ru particle size. Electronic effects derived from the close proximity between K and Ru result in a decrease in the reaction apparent activation energy, as shown by a detailed kinetic analysis.
CitationSayas, S., Morlanés, N., Katikaneni, S. P., Harale, A., Solami, B., & Gascon, J. (2020). High pressure ammonia decomposition on Ru–K/CaO catalysts. Catalysis Science & Technology, 10(15), 5027–5035. doi:10.1039/d0cy00686f
SponsorsSaudi Aramco is gratefully acknowledged for financial support.
PublisherRoyal Society of Chemistry (RSC)
JournalCatalysis Science and Technology
Except where otherwise noted, this item's license is described as Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence.