Study on the Superacid Catalyst SO_4~(2-)/ZrO_2-SiO_2(Ⅰ) —Preparation and Activity for Esterification of Acetic Acid with Butanol
Liao Shi_jun Wang Le_fu Yang Zhao_xi Yu Wen_wei Huang Zhong_tao (College of Chemical Engineering, South China University of Technology, Guangzhou 510640, China)
A new type of superacid catalysts, SO 2- 4/ZrO 2-SiO 2, in which the molar ratios of SiO 2/ZrO 2 range from 0.11 to 30, has been prepared by impregnating the pre_calcined binary oxides with 0.3 to 2.0 mol/dm 3 H 2SO 4 aqueous solutions, followed by calcining at 450 to 650℃ for 3 to 5 hours. The precursor ZrO 2-SiO 2 binary oxides were prepared by a precipitating/mixing_precipitate method. The prepared catalyst showed an activity six to ten times higher than the traditional SO 2- 4/ZrO 2 catalyst for the esterification of acetic acid with butanol. The effects of some preparation conditions, such as the molar ratio of SiO 2/ZrO 2, the concentration of H 2SO 4 aqueous solution, the pre_calcining temperature and calcination temperature on the catalytic activity were investigated. The catalyst with ratio of SiO 2/ZrO 2 of 10 to 15 and soaked with 1.0 mol/dm 3 sulfuric acid solution and calcined at 550 ℃ showed the best activity.
【CateGory Index】： O643