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Henpraserttae, Suparoek; Charojrochkul, Sumittra; Klysubun, Wantana; Lawtrakul, Luckhana; Toochinda, Pisanu
Catalysis letters, 06/2018, Letnik: 148, Številka: 6Journal Article
The development of Ni/Zr-doped Al.sub.2O.sub.3 was achieved to reduce the reaction temperatures in ammonia decomposition by doping Zr into Al.sub.2O.sub.3 framework. The Ni/Zr-doped Al.sub.2O.sub.3 exhibits higher H.sub.2 yield and NH.sub.3 conversion than Ni/gamma-Al.sub.2O.sub.3 in a continuous operation. Partial doping of Zr in Al.sub.2O.sub.3 framework can increase Ni dispersion, Ni surface area and basic sites of the Ni catalyst. These effects can promote in both dehydrogenation of NH.sub.3 and recombination of nitrogen adsorbates in an NH.sub.3 decomposition mechanism. The comparison between roles of Zr as a dopant and a promoter for Ni catalyst was also discussed.
