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- SUZUKI Sadakatu
- Department of Chemical Engineering, Tokyo Institute of Technology
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- ONO Yoshio
- Department of Chemical Engineering, Tokyo Institute of Technology
Bibliographic Information
- Other Title
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- 新しい固体酸触媒 SO3H基をもつポリオルガノシロキサン
- アタラシイ コタイサン ショクバイ SO3Hキ オ モツ ポリオルガノシロキサ
- Polyorganosiloxane Bearing SO<SUB>3</SUB>H Groups
- SO<SUB>3</SUB>H基をもつポリオルガノシロキサン
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Abstract
Solid-acid catalysts having sulfo groups were prepared by two different ways. One way is by surface modification of silica. The other is by the sulfonation of polyorgano-siloxanes. Polysiloxanes containing phenyl, benzyl, 2- (phenyl) ethyl, and 3-mercaptopropyl groups were prepared by co-condensation polymerization of alkoxysilane and alkoxyorganosilane. The ion exchange capacity and the elemental analysis for sulfur and carbon showed that the sulfonated polyorganosiloxanes (SPOS) had much higher acid content (0.8-3.2mmol/g) than the modified silica gel. The thermal stability of SPOS was much higher than Amberlyst 15. Thus, the thermal stability is in a decreasing order; sulfonated polyphenylsiloxane>sulfonated polypropyl-siloxane>Amberlyst 15 under a nitrogen stream, and is in a decreasing order; sulfonated polypropylsiloxane>sulfonated polyphenylsiloxane=Amberlyst 15 under steaming conditions. The catalytic activities for various acid-catalyzed reactions were studied. For vapor phase dehydration of alcohols and the liquid phase esterification, the activities of SPOS were comparable to those of Amberlyst 15. For the vapor-phase nitration of benzene with nitrogen dioxide, the activities of SPOS were much higher than that of the ion-exchange resin.
Journal
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- Journal of Synthetic Organic Chemistry, Japan
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Journal of Synthetic Organic Chemistry, Japan 45 (7), 672-681, 1987
The Society of Synthetic Organic Chemistry, Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001205312588032
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- NII Article ID
- 130000931145
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- NII Book ID
- AN0024521X
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- ISSN
- 18836526
- 00379980
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- NDL BIB ID
- 3144084
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed