Amorphous Carbon Bearing Sulfonic Acid Groups in Mesoporous Silica as a Selective Catalyst

Sulfonic acid group (SO3H)-bearing amorphous carbon/mesoporous silica composites were studied for use as solid acid catalysts. Sugar-derived amorphous carbon with SO3H cannot catalyze hydrophobic acid-catalyzed reactions, such as the dimerization of α-methylstyrene, because of the small surface area...

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Bibliographic Details
Published in:Chemistry of materials 2009-01, Vol.21 (1), p.186-193
Main Authors: Nakajima, Kiyotaka, Okamura, Mai, Kondo, Junko N, Domen, Kazunari, Tatsumi, Takashi, Hayashi, Shigenobu, Hara, Michikazu
Format: Article
Language:English
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Summary:Sulfonic acid group (SO3H)-bearing amorphous carbon/mesoporous silica composites were studied for use as solid acid catalysts. Sugar-derived amorphous carbon with SO3H cannot catalyze hydrophobic acid-catalyzed reactions, such as the dimerization of α-methylstyrene, because of the small surface area. However, SO3H-bearing sugar-derived amorphous carbon supported on mesoporous silica exhibits remarkable catalytic performance for the dimerization of α-methylstyrene. Under optimal conditions, the selectivity of the composite catalysts for unsaturated dimers exceeds 98%. Structural and reaction analyses revealed that SO3H-bearing carbon particles with large surface areas are formed in the mesopores and prevent intramolecular Friedel−Crafts alkylation, resulting in high catalytic activity.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm801441c