TITLE:
Preparation of a Carbon-Based Solid Acid with High Acid Density via a Novel Method
AUTHORS:
Siyu Ouyang, Xiangming Kuang, Qiong Xu, Dulin Yin
KEYWORDS:
Solid Acid Catalysts, Preparation, Biomass, Ketalization
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.2 No.6,
June
9,
2014
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.