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ID 29239
file
creator
Sumiya, Sadanobu
Kubota, Yuka
Oumi, Yasunori
subject
Carboxylic acid
Degradation
Surfactant
SBA-15
MCM-41
Sucrose hydrolysis
NDC
Chemistry
abstract
The calcination and thermal degradation behaviors of surfactants in mesoporous silicas SBA-15 and MCM-41 were investigated by FT-IR, C-13 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 degrees 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.
journal title
Applied Catalysis A: general
volume
Volume 372
issue
Issue 1
start page
82
end page
89
date of issued
2010-01-015
publisher
Elsevier Science BV
issn
0926-860X
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2009 Elsevier B.V. All rights reserved.
relation url
department
Graduate School of Engineering