Preparation of egg-shell type Ni-loaded catalyst by adopting “Memory Effect” of Mg–Al hydrotalcite and its application for CH 4 reforming

Abstract

Ni-loaded catalyst in egg-shell type was successfully prepared by adopting “Memory Effect” of Mg–Al hydrotalcite-like compounds. Mg–Al mixed oxide particles were prepared by calcination of Mg–Al hydrotalcite and dipped in Ni(II) nitrate aqueous solution. Upon dipping, Mg–Al hydrotalcite was reconstituted in the surface layer of the particle and a part of the Mg sites was replaced by Ni. Finally egg-shell type loaded Ni catalyst was obtained after the calcination followed by the reduction of the particles. The catalyst showed a high and stable activity for autothermal CH 4 reforming due to highly dispersed and stable Ni metal particles concentrated in the catalyst surface layer.