Preparation of SO_4^(2-)/TiO_2-WO_3 solid superacid and its catalytic activity in acetalation and ketaltion  

作　　者：YANGShuijin YUXieqing BAIAiming SUNJutang 

机构地区：[1]DepartmentofChemistryandEnvironmentalEngineering,HubeiNormalUniversity,Huangshi435002,China／／CollegeofChemistryandMolecularSciences,WuhanUniversity,Wuhan430072,China [2]DepartmentofChemistryandEnvironmentalEngineering,HubeiNormalUniversity,Huangshi435002,China [3]CollegeofChemistryandMolecularSciences,WuhanUniversity,Wuhan430072,China

出　　处：《Rare Metals》2005年第1期22-27,共6页稀有金属（英文版）

基　　金：ThisworkwasfinanciallysupportedbytheNaturalScienceFoundationofHubeiProvinceEducationCommittee(Nos.2004D007and2002A00008)theNationalNaturalScienceFoundationofChina(No.20471044).

摘　　要：SO_4^(2-)/TiO_2-WO_3 was prepared and its catalytic activity under differentsynthetic conditions was discussed with esterification of n-butanoic acid and n-butyl alcohol asprobing reaction. The optimum conditions are found that the mass fraction of H_2WO_4 used in thecompound is 12.5 percent, the calcination temperature is 580 deg C, the calcination time is 3 h, andthe soaked consistency of H_2SO_4 is 1.0 mol centre dot L^(-1). Then SO_4^(2-)/TiO_2-WO_3 wasapplied as the catalyst in the catalytic synthesis of eight similar important ketals and acetalsunder the optimum conditions and revealed high catalytic activity. On condition that the molar ratioof aldehyde/ketone to glycol is 1:1.5, the mass fraction of the catalyst used in the reactants is0.5 percent, and the reaction time is 1.0 h, the yields of ketals and acetals can reach 64.2percent-95.1 percent. Moreover, it can be easily recovered and reused.SO_4^(2-)/TiO_2-WO_3 was prepared and its catalytic activity under differentsynthetic conditions was discussed with esterification of n-butanoic acid and n-butyl alcohol asprobing reaction. The optimum conditions are found that the mass fraction of H_2WO_4 used in thecompound is 12.5 percent, the calcination temperature is 580 deg C, the calcination time is 3 h, andthe soaked consistency of H_2SO_4 is 1.0 mol centre dot L^(-1). Then SO_4^(2-)/TiO_2-WO_3 wasapplied as the catalyst in the catalytic synthesis of eight similar important ketals and acetalsunder the optimum conditions and revealed high catalytic activity. On condition that the molar ratioof aldehyde/ketone to glycol is 1:1.5, the mass fraction of the catalyst used in the reactants is0.5 percent, and the reaction time is 1.0 h, the yields of ketals and acetals can reach 64.2percent-95.1 percent. Moreover, it can be easily recovered and reused.

关 键 词：solid superacid PREPARATION catalytic activity ACETALATION katalation 

分 类 号：O614.613[理学—无机化学] O631.5[理学—化学]