Synthesis, characterization and catalytic activity of acid-base bifunctional materials through protection of amino groups

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• 作者：Yanqiu Shao^a ; ^b ; Heng Liu^a ; Xiaofang Yu^a ; Jingqi Guan^a ; ^{guanjq@jlu.edu.cn} ; Qiubin Kan^a ; ^{qkan@mail.jlu.edu.cn} ; ^{catalysischina@yahoo.com.cn}
• 关键词：B. Chemical synthesis ; C. Electron microscopy ; C. X-ray diffraction ; D. Catalytic properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：March, 2012
• 卷：47
• 期：3
• 页码：768-773
• 文件大小：546 K

摘要

Acid-base bifunctional mesoporous material SO₃H-SBA-15-NH₂ was successfully synthesized under low acidic medium through protection of amino groups. X-ray diffraction (XRD), N₂ adsorption-desorption, transmission electron micrographs (TEM), back titration, ¹³C magic-angle spinning (MAS) NMR and ²⁹Si magic-angle spinning (MAS) NMR were employed to characterize the synthesized materials. The obtained bifunctional material was tested for aldol condensation reaction between acetone and 4-nitrobenzaldehyde. Compared with monofunctional catalysts of SO₃H-SBA-15 and SBA-15-NH₂, the bifunctional sample of SO₃H-SBA-15-NH₂ containing amine and sulfonic acid groups exhibited excellent acid-basic properties, which make it possess high activity for the aldol condensation.