M.Yu. Smirnova, S.N. Pavlova, T.A. Krieger, Yu.N. Bespalko, V.I. Anikeev, Yu.A. Chesalov, V.V. Kaichev, N.V. Mezentseva, V.A. Sadykov
Synthesis of Ce1-xZrxO2 Oxides in Supercritical Alcohols and Based on Them Catalysts for Carbon Dioxide Reforming of Methane
The paper considers the effect of zirconium starting compounds on the properties of
mixed Ce-Zr oxides synthesized by solvothermal method in a flow reactor using ethanol
and isopropanol as a supercritical media. Phase composition and structural properties
of synthesized samples were investigated by X-ray diffraction and Raman spectroscopy.
The morphology and textural properties were studied by transmission electron
microscopy and thermal desorption of nitrogen. If zirconium oxychloride or acetate
are used, the formation of mixtures of phases enriched in cerium or zirconium is
observed, whereas in the case of zirconium butoxide added with a complexing agent
(acetylacetone) a homogeneous solid solution is formed. The comparison of catalytic
properties of synthesized oxides with supported Ni in the reaction of methane dry
reforming demonstrated that the catalyst based on the single-phase mixed ceria-zirconia
oxide is significantly more active, selective and stable to coking.
Key words: synthesis in supercritical conditions, acetylacetone, mixed Ce-Zr oxides, dry reforming of methane