Key words: synthesis in supercritical conditions, acetylacetone, mixed Ce-Zr oxides, dry 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.