Dry Reforming of Methane over 5%Ni/Ce 1-x Ti x O 2 Catalysts Obtained via Synthesis in Supercritical Isopropanol

A series of 5%Ni/Ce Ti O 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 TiO or mixed Ce-Ti oxid...

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Bibliographic Details
Published inInternational journal of molecular sciences Vol. 24; no. 11
Main Authors Smal, Ekaterina, Bespalko, Yulia, Arapova, Marina, Fedorova, Valeria, Valeev, Konstantin, Eremeev, Nikita, Sadovskaya, Ekaterina, Krieger, Tamara, Glazneva, Tatiana, Sadykov, Vladislav, Simonov, Mikhail
Format Journal Article
LanguageEnglish
Published Switzerland 02.06.2023
Subjects
ceria–titania
heterogeneous catalysis
methane dry reforming
supercritical synthesis
fluorite
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Summary:A series of 5%Ni/Ce Ti O 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 TiO or mixed Ce-Ti oxides appear with Ti introduction. Supported Ni is presented as the NiO or NiTiO 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.
ISSN:1422-0067