Catalytic ammonia decomposition for CO-free hydrogen generation over Ru/Cr2O3 catalysts

• Ru/Cr2O3 catalysts have shown good catalytic performance in ammonia decomposition.
• Particle size and dispersion of Ru catalysts greatly influence catalytic activity.
• Interstitial CrxNy compound is formed during ammonia decomposition.

Uniform and well-dispersed Ru nanoparticles with a diameter of 4–6 nm supported on chromium oxide (Cr2O3) nanoparticles have been prepared via the impregnation method. The catalytic activity of the Ru/Cr2O3 catalyst in ammonia decomposition and the rate of hydrogen generation are evaluated. The physical and chemical properties of Ru/Cr2O3 catalysts were characterized by N2 sorption, XRD, TEM, H2-TPR and XPS. The analysis data show that Ru nanoparticles are well dispersed on mesoporous Cr2O3 supports and have strong interactions with the Cr2O3 support. Ru/Cr2O3 catalysts show good catalytic performance. Complete ammonia decomposition was achieved at 600 °C even at high space velocity (30,000 ml/(h gcat)).

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