Preparation of SO_4~(2-)/TiO_2-WO_3 Through Hydrothermal Modification and Its Application to Catalytic Dehydration of Cyclohexanol to Cyclohexene

Mesoporous TiO2 was prepared by hydrothermal method with Tetrabutyl titanate and Cetyltrimethylammonium bromide,then the solid superacid SO2-4/TiO2-WO3 was obtained by impregnating above mixtures with 1 mol/L H2SO4.The catalyst was applied in the catalytic synthesis of cyclohexene from cyclohexanol and was characterized by IR、XRD.The results showed that when the experiment conditions were optimum,i.e.,w(catalyst)= 5.3%,the reaction temperature was in the range of 170-180 ℃,the reaction time was 45 min,the yield of cyclohexene could reach 95.6 %.The catalyst could be reused for 5 times and the yield was still above 88.9%.If the catalyst which had been reused for five times was regenerated,then its activities could be enhanced as high as the fresh one.Catalyst prepared by this method has a 5.65% higher yield than the catalyst prepared by the ordinary method.