Details

Autor(en) / Beteiligte

• Yang, Ying
• Guan, Jingqi
• Qiu, Pengpeng
• Kan, Qiubin

Titel

Enhanced catalytic performances by surface silylation of Cu(II) Schiff base-containing SBA-15 in epoxidation of styrene with H2O2

Ist Teil von

• Applied surface science, 2010-03, Vol.256 (10), p.3346-3351

Ort / Verlag

Amsterdam: Elsevier

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Schiff base functionalized SBA-15 mesoporous materials were synthesized by post-grafting of salicylaldehyde onto silylated and non-silylated amino-modified SBA-15 and followed by the introduction of Cu(II) ions via a ligand exchange reaction. Both hybrid materials prepared were characterized by XRD, FT-IR, UV-vis spectroscopy, N2 adsorption/desorption, TG/DTA and ICP-AES techniques and comparatively examined as catalysts in epoxidation of styrene with 30wt.% aqueous hydrogen peroxide as oxidant. It was found that the silylated material was more active and selective to styrene oxide than the non-silylated one in CH3CN. The considerably improved activity (86.1%) and styrene oxide selectivity (95.2%) were achieved after 30min when adding sodium hydroxide to maintain a pH of 7.5-8.0 in reaction medium. Moreover, the silylated catalyst showed good recoverability and relatively high stability against leaching of active copper species. These superior effects were attributed to the high hydrophobic character of the solid surface produced by the silanol neutralization.