Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 285, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119831
Keywords
Ru-supported catalyst; Lanthania-ceria composite; Deposition-precipitation; Ammonia decomposition; Hydrogen production
Funding
- Korea Research Institute of Chemical Technology (KRICT) [SI2011-30]
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In this study, Ru-doped LaxCe1-xOy composites were investigated for NH3 decomposition to generate COx-free H-2. The catalyst Ru/La0.33Ce0.67 showed superior catalytic activity and stability, highlighting the importance of Ru size and interaction with the composite for enhanced NH3 decomposition.
Ru doped on a series of LaxCe1-xOy composites by the deposition-precipitation (DP) method was studied in NH3 decomposition to generate COx-free H-2. N-2 physisorption, CO chemisorption, XRD, XPS, XAS, ICP-OES, HAADFSTEM, TPR, and TPD analysis were used to investigate the catalyst properties and to elucidate the beneficial properties for the reaction. Density functional theory (DFT) calculations provided insights into how the La addition promoted the high recombinative N-2 desorption capacity leading to the high NH3 decomposition activity of the Ru-based catalysts at low temperatures. Among the tested catalysts, Ru/La0.33Ce0.67 exhibited superior catalytic activity and excellent stability. This study provides direct proof that the combination of the relatively small Ru size with strong interaction with the composite LaxCe1-xOy by the DP method and the optimized acidity-basicity property for the enhancement of both H-2 and N-2 desorption is essential to the development of Ru-based catalysts for NH3 decomposition.
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