Preparation of Nanoporous CeO₂ Catalyst Supports by Chemical Treatment of Amorphous Alloys and Investigation of Ni/CeO₂ Catalytic Activity

Abstract

Nanoporous CeO 2 was prepared implementing the dealloying method on precursors consisting of CeAl alloys characterized by different atomic arrangements. In fact, the atomic arrangement of the precursor alloy strongly influence the surface area of CeO 2 in the final product. Nanoporous CeO 2 with quite high surface area were formed when an amorphous CeAl alloy was used as the precursor. The catalytic performance of the catalyst that Ni was supported on CeO 2 prepared from amorphous alloy were evaluated based on the reaction whereby molecular hydrogen is released from ammonia borane. A high level of catalytic activity was observed due to that fine Ni particles were dispersed on CeO 2 prepared from amorphous alloy with quite high surface area.

Pd-Dispersed CeO₂ Catalyst Prepared from Dealloying the Pd–Ce–Al Ternary Amorphous Alloy Used for Oxidation Reaction

“…9) In our previous studies, 1013) the CeO 2 porous particles prepared from dealloying of a CeAl amorphous alloy as the precursor alloy were found to be higher in surface area than a commercial CeO 2 , controlling their size and morphology as a function of dealloying time and precursor crystallinity. It was clearly showed that the catalysts composed of AuPd, 10) Ru, 11) Ni, 12) and Au 13) supported-CeO 2 from an amorphous alloy showed higher catalytic activity in hydrogen generation 1012) and oxidation 13) reactions than use of CeO 2 prepared from a crystalline alloy.…”