Catalysis Letters, Vol.148, No.6, 1775-1783, 2018
Reduced Temperature Ammonia Decomposition Using Ni/Zr-Doped Al2O3 Catalyst
The development of Ni/Zr-doped Al2O3 was achieved to reduce the reaction temperatures in ammonia decomposition by doping Zr into Al2O3 framework. The Ni/Zr-doped Al2O3 exhibits higher H-2 yield and NH3 conversion than Ni/gamma-Al2O3 in a continuous operation. Partial doping of Zr in Al2O3 framework can increase Ni dispersion, Ni surface area and basic sites of the Ni catalyst. These effects can promote in both dehydrogenation of NH3 and recombination of nitrogen adsorbates in an NH3 decomposition mechanism. The comparison between roles of Zr as a dopant and a promoter for Ni catalyst was also discussed. [GRAPHICS] .
Keywords:Ammonia decomposition;Hydrogen production;Support modification;Partial doping of Zr in Al2O3 framework;Ni/Zr-doped Al2O3 catalyst