Hydrothermal stability of mesoporous Ni-doped .GAMMA.-Al2O3

Abstract

Ni-doped γ-Al2O3 with different molar compositions has been synthesized on α-Al2O3 porous supports by the sol-gel method using nitrate-alkoxide precursors. The increasing of lattice constants by Ni doping showed the formation of uniform solid solution. When the Ni content increased up to 10 mol%, NiO phase was formed. The relationship between molar compositions and hydrothermal stability under atmosphere of steam/N2 = 3 at 773 K for 0-50 h was compared. The pore size distribution of 5 mol% Ni-doped γ-Al2O3 on α-Al2O3 porous support was stable even after hydrothermal exposure at 773 K for 50 h.