Synthesis of Benzyl Propionate Catalytic by Rare-Earth Solid Superacid SO_4~(2-)/TiO_2/La~(3+)

The rare-earth solid superacids—SO~(2-)_4/TiO_2/La~(3+) was prepared by precipitation and impregnation and characterized by IR,XRD and Hammett indicator.Benzyl propionate was synthesized with solid superacid SO~(2-)_4/TiO_2/La~(3+) as a catalyst and with propionic acid and benzyl alcohol as reactants.The effect on the condition of preparation of the catalyst and the condition of synthesis of the yield has been studied.The best condition of preparation is as following:La~(3+) concentration of the soak solution:0.07 mol·L~(-1),the calcination temperature:500℃ and the calcination time:3 h.The best condition of reaction is as follow:n(benzyl alcohol)∶n(propionic acid)=1.0∶2.0.The amout of catalyst is 9.3% of benzyl alcohol.The reaction time is 3.0 h.The reaction temperature 120℃.The yield of benzyl alcohol was about 84.%.Structure of the product was identified by methods of IR and ()~1H-NMR.