Dry Reforming of Methane over 5%Ni/Ce1-xTixO2 Catalysts Obtained via Synthesis in Supercritical Isopropanol

Abstract

A series of 5%Ni/Ce1-xTixO2 catalysts was prepared with nickel impregnation of mixed Ce–Ti oxides obtained via synthesis in supercritical isopropanol. All oxides have a cubic fluorite phase structure. Ti is incorporated into the fluorite structure. Small amounts of impurities of TiO2 or mixed Ce–Ti oxides appear with Ti introduction. Supported Ni is presented as the NiO or NiTiO3 perovskite phase. Ti introduction increases total samples reducibility and results in stronger interaction of supported Ni with the oxide support. The fraction of rapidly replaced oxygen and the average tracer diffusion coefficient also increase. The number of metallic nickel sites decreased with increasing Ti content. All catalysts except Ni-CeTi0.45 demonstrate close activity in tests of dry reforming of methane. The lower activity of Ni-CeTi0.45 can be connected to Ni decoration with species of the oxide support. The incorporation of Ti prevents detachment of Ni particles from the surface and their sintering during dry reforming of methane.

TiO2-Supported Perovskite-Induced Bimetallic Ni–Co Nanoparticles for the Dry Reforming of Methane

“…NiTiO 3 have become efficient and robust host oxides since they contain both metal nanoparticles and counterpart support from subsequent topotactic exsolution processes. − Highly dispersed metal nanoparticles could grow in situ and be anchored on the surface of the catalyst. Smal et al synthesized a series of 5% Ni/Ce 1– x Ti x O 2 catalysts via an impregnation method. All oxides have a cubic fluorite phase structure; Ti is incorporated into the fluorite structure.…”

“…29−31 Highly dispersed metal nanoparticles could grow in situ and be anchored on the surface of the catalyst. Smal et al32 synthesized a series of 5% Ni/Ce 1−x Ti x O 2 catalysts via an impregnation method. All oxides have a cubic fluorite phase structure; Ti is incorporated into the fluorite structure.…”