[Back]

J. Zhang, J. Yang, J. Wang, H. Ding, Q. Liu, U. Schubert, Y. Rui, J. Xu:
"Surface oxygen vacancies dominated CeO2 as efficient catalyst for imine synthesis: Influences of different cerium precursors";
Journal of Molecular Catalysis A: Chemical, 443 (2017), 443; 131 - 138.

CeO2 as catalysts for imine synthesis was synthesized from three different inorganic precursors (Ce(OH)4, Ce(COOCH3)3·5H2O and Ce(NO3)3·6H2O) in ethylene glycol (EG) as solvothermal solvent. The influences of some parameters were investigated, such as the surfactant olyvinylpyrrolidone (PVP), H2O as co-solvent, and CH3COOH or NaOH as mineralizer (exclusive for Ce(NO3)3 as the precursor). The different precursors influenced the coordination of EG with cerium, crystalline, surface structure and also the catalytic ability for imine synthesis. The highest imine conversion rate was obtained when CeO2 was synthesized from Ce(NO3)3 + PVP + CH3COOH +EG. The mechanism was investigated by carefully checking the structures of the synthesized CeO2, such as XRD, morphology, surface area, XPS and so on, and figured out that the high catalytic activity of the best CeO2 sample was much more related with the high proportion of surface oxygen vacancies than the surface area and the Ce3+ ratio.

http://dx.doi.org/10.1016/j.mcat.2017.09.030

http://publik.tuwien.ac.at/files/publik_263537.pdf