Preparation and catalytic performance of sulfonated charcoal-based solid acid catalyst

The novel carbon-based solid acids were synthesized through the carbonation and then sulfonation of the bamboo charcoal in sulfuric acid. The esterification of sebacic acid and n-butyl alcohol was taken as the model reaction to investigate the impact of preparation parameters on the catalyst activity. FTIR,XRD,SEM and TGA were used to characterize the catalyst. The results showed that the carbon-based solid acid catalyst was prepared under the optimal conditions of carbonization at 325 ℃ for 1 h and then sulfonation at 125 ℃ for 1 h exhibiting higher catalytic activity,it's sulfuric acid group can be reached 1. 4 mmol / g. The conversion rate of sebacic acid reached 99% after reaction and the catalyst can be recycled for several times. Through characterization of the catalyst the carbon-based solid acid catalyst exhibit amorphous carbon structure and the onset thermal decomposition temperature of carbon-based solid acid catalyst is above 230 ℃.