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Hydrothermal degradation of model sulfonic acid compounds: Probing the relative sulfur–carbon bond strength in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
49603 46756 2014 4 PDF Available
Title
Hydrothermal degradation of model sulfonic acid compounds: Probing the relative sulfur–carbon bond strength in water
Abstract

•Sulfonic acid compounds were hydrothermally stable at 100 °C.•At 130 °C, substituted aromatic compounds degraded.•Non-substituted benzene sulfonic acid degraded after 24 h at 160 °C.•Alkyl sulfonic acids had superior hydrothermal stability.

Development of heterogeneous catalysts for the biorenewable industry requires hydrothermal degradation resistance. However, the relationship between hydrothermal stability and the immediate electronic hybridization of the carbon atoms adjacent to the sulfonic acid active group is not fully known. We systematically tested model compounds containing sulfonic acid groups linked to aromatic, alkane, or cycloalkane carbon atoms. We subjected them to hydrothermal conditions. The compounds' structural integrity was monitored with solution NMR. The aromatic-sulfonic acid compounds degraded readily, while the hydrolysis of the alkyl sulfonic acid linkages was negligible. Therefore, hydrothermally stable sulfonic-acid catalysts need sulfonic acid attached via alkyl linkers.

Keywords
Sulfonated carbon; Hydrothermal stability; NMR characterization
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Hydrothermal degradation of model sulfonic acid compounds: Probing the relative sulfur–carbon bond strength in water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 51, 5 June 2014, Pages 33–36
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Any Questions? feel free to contact us