稀土元素改性SO(上标 2- 下标 4)/TiO2及其催化合成乙酸松油酯的研究

Common solid superacid SO(superscript 2- subscript 4)/TiO2 was modified by several rare earth elements. The results showed that Ce(superscript 4+) was the best modifying agent among these rare earth substances. Ce(superscript 4+)-modified solid surperacid SO(superscript 2- subscript 4)/TiO2-Ce(superscript 4+) displayed excellent activity when superacid SO(superscript 2- subscript 4)/TiO2 was impregnated by 7.5% Ce(superscript 4+) and then calcined at 500℃for 3 h. The structure of SO(superscript 2- subscript 4)/TiO2-Ce(superscript 4+) was characterized by TEM, XRD and IR methods. The catalyst was a nanomaterial with uniform granularity of 32 nm. Synthesis of terpinyl acetate from terpineol and acetic anhydride with solid superacid SO(superscript 2- subscript 4)/TiO2-Ce(superscript 4+) as catalyst had been studied for the first time. By orthogonal test, the optimum condition was obtained as follows: reaction temperature 70℃, reaction time 6 h, catalyst dosage 3%, ratio of terpineol to acetic anhydride 1:1.5. Under this condition, the conversion of terpineol was over 99%, and the content of terpinyl acetate in the product was 90%. Compared with common superacid SO(superscript 2- subscript 4)/TiO2, the modified SO(superscript 2- subscript 4)/TiO2-Ce(superscript 4+) had higher catalytic activity and selectivity.