Exploring the catalytic activity of regular and ultralarge-pore Nb,Sn-SBA-15 mesoporous molecular sieves
A novel bifunctional mesoporous material Nb,Sn-SBA-15 has been synthesized in one pot synthesis by in-situ introduction of niobium and tin salts and by controlling the synthesis conditions. These molecular sieves possess a high dispersion of both metals resulting in both the strong and weak acidic sites being simultaneously formed on SBA-15. Optimization of acid concentration in synthetic gels resulted in tuning of pore geometries while maintaining high structural regularity and in pore size enlargement up to 14 nm. The nature and the coordination of T atoms in silica frameworks appropriate for catalytic applications were proved by UV-vis spectroscopy and catalytic reaction. Activity and selectivity of niobium/tincontaining mesoporous molecular sieves have been tested in liquid phase oxidation of cyclohexene. On the basis of this investigation, the new efficient NbSBA-15 catalyst prepared via conventional synthesis has been selected.
Izabela Nowak Agnieszka Feliczak Aleksandra Tomczak Iveta Nekoksová Jiri Cejka
Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland. Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland J. Heyrovsk(y) Institute of Physical Chemistry, Academy of Sciences of the Czech Republic,Dolej(s)ko
国际会议
北京
英文
2007-08-12（万方平台首次上网日期，不代表论文的发表时间）