Characterization of K-Promoted Ru Catalysts for Ammonia Decomposition Discovered Using High-Throughput Experimentation
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We obtain H2 from low temperature NH3 decomposition using a new hollandite (KRu4O8) catalyst supported on γ-Al2O3 discovered using high-throughput experimentation and advanced TEM/SEM characterization. Relative to the base Ru° catalyst, this new catalyst shows NH3 conversion enhancements of 30–50% at T = 350 °C and decomposition activity at temperatures decreased by 50–100 °C. TEM analysis over the lifetime of the catalyst shows multiple phases and morphologies suggesting that the KRu4O8 behaves either as a new low-temperature decomposition catalyst or as a precursor to the active catalyst.
KeywordsNH3 decomposition KRu4O8 hollandite K-promoted Ru catalysts TEM SEM High-throughput experimentation
We acknowledge many fruitful discussions with Elizabeth D’Addio, Hua Yang, and Professor Dion Vlachos. This work was supported by the U.S. Department of Energy, Grant #DE-FG02-06ER15795. WDP and DJB thank Chaoying Ni and Frank Kriss with the Keck Electron Microscopy Facility for EM assistance.