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Mesoporous silicas containing carboxylic acid: Preparation, thermal degradation, and catalytic performance

Paper ID Volume ID Publish Year Pages File Format Full-Text
42371 45922 2010 8 PDF Available
Title
Mesoporous silicas containing carboxylic acid: Preparation, thermal degradation, and catalytic performance
Abstract

The calcination and thermal degradation behaviors of surfactants in mesoporous silicas SBA-15 and MCM-41 were investigated by FT-IR, 13C CP/MAS NMR, TG/DTA, and GPC. It was found that carboxylic acid-containing products were generated as active components in the mesopores of SBA-15 and MCM-41 from the triblock copolymer (PEO)20(PPO)70(PEO)20 and cetyltrimethylammonium bromide (CTAB), respectively; the latter materials were used as templates. The carboxylic acid-containing mesoporous silica obtained showed a catalytic activity for hydrolysis of sucrose. The acidity was evaluated by means of NaOH titration. The acidity sensitively depended on both the calcination temperature and the atmosphere; the maximum appeared at 150 °C in air for SBA-15 where the highest activity was observed. However, the product in MCM-41 showed a lower catalytic activity than that in SBA-15. The SBA-15 product was easily leached from the mesopores of SBA-15 into the solution, but the degree of leaching for MCM-41 was considerably smaller than that for SBA-15.

Graphical abstractCarboxylic acid-containing products were generated in the mesopores of SBA-15 and MCM-41 during the calcination and thermal degradation of the triblock copolymer, (PEO)20(PPO)70(PEO)20, and cetyltrimethylammonium bromide (CTAB) as templates. The acidity sensitively depended on both the calcination temperature and the atmosphere.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Carboxylic acid; Degradation; Surfactant; SBA-15; MCM-41; Sucrose hydrolysis
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Mesoporous silicas containing carboxylic acid: Preparation, thermal degradation, and catalytic performance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 372, Issue 1, 5 January 2010, Pages 82–89
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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