Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 28, Pages 4500-4506Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201200498
Keywords
Zwitterions; Mesoporous materials; Organic-inorganic hybrid composites; Heterogeneous catalysis; Aldol reactions
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Funding
- National Natural Science Foundation of China (NSFC) [20901076, 21006102]
- Ph. D. Program of the Startup and Natural Science Foundation of Liaoning Province, China [20091085, 20092174]
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Zwitterionic hybrid SBA-15 mesoporous silica materials containing both amine and sulfonic acid groups have been synthesized through cocondensation from as-synthesized zwitterionic siloxane precursors (ZS) with tetraethoxysilane (TEOS). Characterization by XRD, TEM, and N2 adsorptiondesorption measurements show that the as-synthesized materials have ordered mesostructures. Analysis with UV, 29Si/13C cross-polarization magic angle spinning (CP-MAS) NMR, and X-ray photelectron spectroscopy (XPS) and elemental analysis demonstrates that the zwitterionic parts have been successfully introduced into the silica framework, and the organic contents of 15?% hybrid samples are over 1.0 mmol/g. The presence of a secondary organoamine group enables the hybrid material to be further alkalized to achieve the desired basic properties. The materials were used as catalysts for the aldol condensation of acetone with 4-nitrobenzaldehyde. With a good catalytic performance, the catalyst could be easily separated, recycled, and reactivated by secondary basification.
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