ОСОБЕННОСТИ ТЕРМИЧЕСКОГО РАЗЛОЖЕНИЯ НОВОГО ПРЕКУРСОРА СМЕШАННЫХ ОКСИДОВ Mg–Zr

Igor Krivtsov; Darya Kasatkina; Vyacheslav Avdin

Authors

Igor Krivtsov South Ural State University, Chelyabinsk, Russian Federation
Darya Kasatkina South Ural State University, Chelyabinsk, Russian Federation
Vyacheslav Avdin South Ural State University, Chelyabinsk, Russian Federation

Keywords:

ZrO2, MgO, MgO/ZrO2, mixed oxides, sol-gel, peroxocomplex, aldol condensation

Abstract

A new peroxo-method for Mg–Zr mixed oxide preparation has been applied. It has been established that this precursor after being heated up to 700 ºC is in the form of poorly crystalline Mg–Zr oxide. Thermal and X-ray diffractional analyses have shown that the oxide phase is formed directly from amorphous peroxocomplex, avoiding formation of intermediate Mg(OH)₂ phase. The peroxocomplex-mediated route allows achieving high degree of molecular homogeneity in the mixed oxide and high distribution of the active sites due to its low crystallinity. The prepared material is a potential catalyst for aldol condensation reaction.

Author Biographies

Igor Krivtsov, South Ural State University, Chelyabinsk, Russian Federation

кандидат химических наук, инженер НОЦ «Нанотехнологии»

Darya Kasatkina, South Ural State University, Chelyabinsk, Russian Federation

аспирант, химический факультет

Vyacheslav Avdin, South Ural State University, Chelyabinsk, Russian Federation

доктор химических наук, профессор, декан химического факультета

References

Faba L., Diaz E., Ordonez S. Improvement of the Stability of Basic Mixed Oxides Used as Catalysts for Aldol Condensation of Bio-derived Compounds by Palladium Addition. Biomass and Bioenergy, 2013, vol. 56, pp. 592–599.

Faba L., Diaz E., Ordonez S. Aqueous-phase Furfural-acetone Aldol Condensation Over Basic Mixed Oxides. Applied Catalysis B: Environmental, 2012, vol. 113, pp. 201–211.

Faba L., Diaz E., Ordonez S. Gas Phase Acetone Self-condensation Over Unsupported and Supported Mg–Zr Mixed-oxides Catalysts. Applied Catalysis B: Environmental, 2013, vol. 142–143, pp. 387–395.

Sadaba I., Ojeda M., Mariscal R., Richards R., Lopez Frandos M. Preparation and Characterization of Mg–Zr Mixed Oxide Aerogels and Their Application as Aldol Condensation Catalysts. A European Journal of Chemical Physics and Physical Chemistry, 2012, vol. 13, pp. 3282–3292.

Gawande M.B. Rathi A.K., Branco P.S., Potewar T.M., Velhinho A., Nogueira I.D., Tolstogouzov A., Amjad A.G, Orlando M. N. D. Teodoro. Nano-MgO–ZrO2 Mixed Metal Oxides: Characterization by SIMS and Application in the Reduction of Carbonyl Compounds and in Multicomponent Reactions. RSC Advances, 2013, vol. 3, pp. 3611–3617.

Aramendia M.A., Boráu V., Jiménez C, Marinas A., Marinas J.M., Navı o J.A., Ruiz J.R., Urbano F.J. Synthesis and Textural-structural Characterization of Magnesia, Magnesia – titania and Magnesia – zirconia Catalysts. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2004, vol. 234, pp. 17–25.

Ichinose H., Terasaki M., Katsuki H. Synthesis of Peroxo-modified Anatase Sol from Peroxo Titanic Acid Solution. Journal of Ceramic Society of Japan, 1996, vol. 104, pp. 715–718.