Title: Catalytic Behavior of SBA-15 Supported Heteropoly Compounds in Synthesis of Fructone
Abstract: Catalysts of 12-tungstophoric acid (PW), cesium salt of PW and potassium salt of PW supported on mesoporous silica SBA-15 with different loadings were prepared by impregnation, respectively. Their catalytic behaviors were investaged via the acetalization of ethyl acetoacetate with ethylene glycol to synthesize fructone. The physical and chemical properties of the catalysts prepared were characterized by N2 adsorption, Hammett indicator and FT-IR. The catalytic stability of the catalysts was evaluated by water treatment test, in which the concentration of the heteropoly compound leaking into the water was measured by ultraviolet-visual spectrophotometer. It is found that the catalysts have no activity in the synthesis of fructone when the loading of PW on SBA-15 is lower than 30% and the loading of Cs salt or K salt of PW on SBA-15 is lower than 20%. During repeatedly using, the deactivation of the catalysts prepared is closely associated with the leakage of active heteropoly species into the polar solvent. Since in the polar reaction system, the cesium salts of PW are water-tolerant, it causes the catalyst of supported cesium salts of PW on SBA-15 has higher catalytic stability.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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