Abstract
In the present study, CO2 methanation with Ru nanoparticles loaded onto three TiO2 nanocrystal supports (TiO2 anatase with both exposed (001) facets and oxygen vacancies, TiO2 anatase with exposed (001) facets and general TiO2 anatase) was demonstrated. The three samples were denoted as Ar700-R, 700-R and Ana-R, respectively. XRD results confirmed that Ar700-R and 700-R sample exposed (001) facets, XPS and EPR results demonstrated the presence of oxygen vacancies on the surface of Ar700-R. In tests of CO2 methanation activity, Ar700-R showed the highest CO2 conversion efficiency of 75% and CH4 formation rate of 18.84 μmol•g−1•s−1 (GHSV = was 21600 ml•h−1•g−1) at 400 °C. The enhanced CO2 methanation activity of Ar700-R was attributed to the co-activity achieved by exposing (001) facets and oxygen vacancies on the surfaces of TiO2 nanocrystal supports.
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