GUO Hongqi, MAO Mingfu, NI Zhongbin, CHEN Mingqing, LIU Shirong
(School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China)
Abstract: 12-tungstophosphoric acid was supported on SBA-15 and amine-modified SBA-15 by impregnation. The structure and properties of the catalyst were characterized by FT-IR spectroscopy, X-ray diffraction, N2 adsorption-desorption, TEM,Raman spectra and NH3–TPD technology.the result confirmed the mesostructure for SBA-15 and the Keggin structure of the heteropolyanions was preserved. However, Aggregation occured in the high loading, and because of the pore blockage, the BET surface area, pore volume and pore diameter decreased obviously. The tungstophosphoric acid can disperse in the pore of the support SBA-15/NH2, but the acidity of the catalyst reduced. The catalytic activities of the catalysts were evaluated for the esterification reaction of ethyl acetoacetate and ethylene glycol .and the catalysts supported on amine-modified SBA-15 show excellent reusability and selectivity.
Key words: SBA-15; amino modification; 12-Tungstophosphoric Acid; Supported Catalyst; Ethyl acetoacetate ethylene glycol ketal
E-mail: liushirong1@yahoo.com.cn
Journal of Molecular Catalysis, Vol. 25, Issue 6, 2011, 496-502
