Morphology dependent? Elucidating the catalyst structures of Ni/Ce_(0.75)Zr_(0.25)O_(2) in the steam reforming of acetic acid

In this work,the steam reforming of acetic acid was catalyzed by Ni-based catalysts supported on ceria-zirconia of different morphological structures(nanopolyhedra,nanorods,and nanocubes).The altered shapes led to the variation in catalyst properties,such as the exposed planes,ease of Ni reduction/oxidation,and carbon removal,which affected its catalytic performance.Additionally,it was found that the exposed planes present in cubic{100}and rod structures({100}and{110})enhanced the formation of Ni^(0) and subsequently promoted the reforming reaction.Moreover,oxygen vacancies and mobility properties of{100}and{110}exposed planes can promote the oxidation reaction of carbon,resulting in a stable catalyst for the reforming of acetic acid.The results also showed that the type of depositing carbons was influenced by the support morphology.All the catalysts showed a100% acetic acid conversion with the 15Ni/NC-Ce Zr(cubic structure)catalyst exhibited the highest hydrogen yield.