The production of diesel from vegetable oil calls for an efficient solid catalyst to make the process fully ecologically friendly. Here we describe the preparation of such a catalyst from common, inexpensive sugars. This high-performance catalyst, which consists of stable sulphonated amorphous carbon, is recyclable and its activity markedly exceeds that of other solid acid catalysts tested for 'biodiesel' production.
Carbonization of d-glucose at 573−723 K followed by sulfonation produces a functionalized amorphous
carbon material with acid catalytic activity as a solid-acid replacement for sulfuric acid. The carbon
material contains phenolic hydroxyl, carboxylic acid, and sulfonic acid groups and exhibits high catalytic
performance for liquid-phase acid-catalyzed reactions. Carbonization at higher temperature followed by
sulfonation also results in amorphous carbon, but the resultant does not exhibit catalytic activity although
the amorphous carbon has sufficient amount of sulfonic acid groups. Structural and active site analyses
suggest that the marked difference in catalytic activity is due to the accessibility of reactants to sulfonic
acid groups in the carbon structure.
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