Preparation of a Carbon-Based Solid Acid with High Acid Density via a Novel Method

Siyu Ouyang, Xiangming Kuang, Qiong Xu^*, Dulin Yin^*

National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, China.

DOI: 10.4236/msce.2014.26002                

Abstract

A carbon-based solid acid with high acid density was successfully prepared using camphor tree branches as raw materials through a novel method including dilute sulfuric acid activation, carbonization in refluxing solvent and sulfonation. Physical characterization was detected to show that the carbon-based acid is amorphous with polycyclic aromatic carbon sheets attached plentiful -OH, -COOH, and -SO3H groups. The sulfonic acid density and total acid density of it reached 2.05 mmol·g^-1 and 5.63 mmol·g^-1, respectively by acid-base titration. As a solid acid catalyst, it showed excellent performance in the ketalization of cyclohexanone with glycol.

Keywords

Solid Acid Catalysts, Preparation, Biomass, Ketalization

Conflicts of Interest

The authors declare no conflicts of interest.

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