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 ar...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.展开更多
SO4^2-/TiO2-MoO3, a novel solid superacid, has been prepared and its catalytic activity at different synthetic conditions was examined with esterification of n-butanoic acid and n-butyl alcohol as probing reaction.The...SO4^2-/TiO2-MoO3, a novel solid superacid, has been prepared and its catalytic activity at different synthetic conditions was examined with esterification of n-butanoic acid and n-butyl alcohol as probing reaction.The optimum conditions were also found, that is, the mass ratio of MoO3 used in the compound is 25%, the calcination temperature 450℃, and the soaked consistency of H2SO4 is 0.5mol.L^-1. Then it was applied in the catalytic synthesis of six similar important ketals and acetals as catalyst and revealed high catalytic activity. Under the condition that the molar ratio of aldehyde/ketone to glycol was 1:1.5, the mass ratio of the catalyst to the reactants was 0.5% and the reaction time 1.0 h, the yield of ketals and acetals reached up to 63.2%. The catalyst can be easily recovered and reused.展开更多
基金supported by the Natural Science Foundation of Hubei Province Education Committee(Nos.2004D007and2002A00008)the National Natural Science Foundation of China(No.20471044)
文摘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.
文摘SO4^2-/TiO2-MoO3, a novel solid superacid, has been prepared and its catalytic activity at different synthetic conditions was examined with esterification of n-butanoic acid and n-butyl alcohol as probing reaction.The optimum conditions were also found, that is, the mass ratio of MoO3 used in the compound is 25%, the calcination temperature 450℃, and the soaked consistency of H2SO4 is 0.5mol.L^-1. Then it was applied in the catalytic synthesis of six similar important ketals and acetals as catalyst and revealed high catalytic activity. Under the condition that the molar ratio of aldehyde/ketone to glycol was 1:1.5, the mass ratio of the catalyst to the reactants was 0.5% and the reaction time 1.0 h, the yield of ketals and acetals reached up to 63.2%. The catalyst can be easily recovered and reused.
