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Control of amine functionality distribution in polyvinylamine/SBA-15 hybrid catalysts for Knoevenagel condensation

Paper ID Volume ID Publish Year Pages File Format Full-Text
49877 46770 2015 6 PDF Available
Title
Control of amine functionality distribution in polyvinylamine/SBA-15 hybrid catalysts for Knoevenagel condensation
Abstract

•Poly(N-vinylformamide) can be deposited on SBA-15 surface by in situ polymerization.•Acid-catalyzed hydrolysis transforms surface amide groups into amine ones.•Distribution of N-containing species is controlled by neutralization at different pH.•NH2 species deposited on SBA-15 are active sites in Knoevenagel condensation.•The best results are achieved for reaction involving methylene compound with low pKa.

Poly(N-vinylformamide) was deposited on the surface of highly ordered hexagonal mesoporous silica SBA-15 by in situ polymerization. Acid-catalyzed hydrolysis followed by neutralization with NaOH (pH = 7.0–10.0) allowed obtaining the poly(vinylamine)/SBA-15 hybrid materials with various distributions of N-containing species, which were determined by XPS and DRIFT spectroscopy. The changes in the form of deposited polymer as well as its interaction with the silica support were discussed. The poly(vinylamine)/SBA-15 materials were tested as catalysts of Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate, ethyl acetoacetate and diethyl malonate. It was found that the sample neutralized at pH = 9.0 showed the best catalytic performance, which was attributed to a high content of accessible NH2 groups.

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Keywords
SBA-15 mesoporous silica; Polyvinylamine; Basic catalysts; Knoevenagel condensation; Surface composition
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Control of amine functionality distribution in polyvinylamine/SBA-15 hybrid catalysts for Knoevenagel condensation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 64, 5 April 2015, Pages 52–57
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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