Preparation And Application Of The Supported Carbon-Based Solid Acid

Solid acids are environmentally friendly catalysts that have wide applications in chemical industry.A carbon-based solid acid and supported carbon-based solid acid were prepared by a new approach and the structure was characterized.The catalytic performance of the carbon-based solid in synthesis of Ethyl Acetate,Methylene Diphenyl Dicarbamate(MDC) and p-Aminophenol(PAP) was studied.IR,XRD,¹³C MAS NMR were employed for the catalyst characterization.Results showed that the carbon-based solid acids prepared with different starting materials all contained -SO₃H and the phase composition was amorphous structure.The effects of preparation and reaction conditions such as calcination time,calcination temperature,catalyst amount,reaction time on catalytic performance were studied.The optimum preparation conditions were as follows: calcination temperature 270℃,calcination time 2h.The catalytic activity prepared withβ-naphthalenesulfonic acid was better than naphthalene.The highest acetic acid conversion was 92.9%under the optimum reaction conditions.Supported carbon-based solid acid was prepared with SiO₂,γ-Al₂O₃,AC.The supported carbon-based solid acid with SiO₂ exhibted highest catalytic activity and acetic acid conversion was over 93%.Absorption peak of B-acid was detected by Py-IR.The activity of catalysts reduced after rused four times.Element analysis revealed that there was loss element sulphur.The catalytic activity on Methyl Pheneyl Carbamate condensation of Supported carbon-based solid acid prepared with SiO₂ was studied.The maxinmum yield of Methylene Diphenyl Dicarbamate was 11.5%under conditions of reaction temperature 90℃and reaction time 4.5h.The performance of such catalysts on catalytic hydrogenation of nitrobenzene to p-Aminophenol was studied.Under conditions of reaction temperature 160℃and reaction time 2h,the maxinmum yield of PAP was 49.3%...