COWHIDE COLLAGEN FIBERS AS BIOTEMPLATES FOR PREPARATION OF FIBROUS SO_4~(2-)7ZrO_2-NiO SOLID ACID CATALYST AND THEIR APPLICATION IN ESTERIFICATION

摘要

Cowhide collagen fibers were used as biotemplates to prepare a series of fibrous SO_4~(2-)/ZrO_2-NiO solid acid catalysts. The as-prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), N_2 adsorption/desorption isotherms and the temperature-programmed decomposition (TPD), respectively. The characterization suggested that the SO_4~(2-)/ZrO_2-NiO catalysts have well-defined fibrous morphology which maintains the fibrous structure of cowhide collagen fibers. TPD of ammonia indicated that the catalyst had both medium strong acidic sites and strong acidic sites. The esterification of acetic acid with n-butanol was utilized as model reaction to evaluate the catalytic performance of the catalysts. The catalyst has exhibited high catalytic activity and good reusability.