La-SO_4^(2-)改性Al-SBA-15催化剂的制备与应用

Preparation and application of Al-SBA-15 molecular sieve modified with lanthanum and SO_4^(2-)

以Al-SBA-15为载体,采用浸渍法制备La-SO24-/Al-SBA-15催化剂,考察催化剂的制备条件。结果表明,La3+浓度为0.03 mol.L-1和500℃焙烧3 h制得的La-SO24-/Al-SBA-15在催化乙酸正丁酯反应中具有良好的催化性能。将制得的La-SO24-/Al-SBA-15催化剂应用于乙酸正丁酯合成,结果表明,在n(冰乙酸)∶n(正丁醇)=1∶1.2、催化剂用量为冰乙酸质量的6%和反应3.5 h条件下,酯化率达97.85%。

Using Al-SBA-15 as the support, La-SO42-/Al-SBA-15catalysts were prepared by impregnation method, and their preparation conditions were investigated. The results showed that La-SO42-/Al-SBA-15 catalyst had good catalytic performance under the preparation condition of impregnation solution c（ La3＋ ） = O. 03 mol ·L-1 ,calcination temperature 500℃ ,and calcination time 3 h. La-SO42-/Al-SBA-15 catalyst was applied to synthetize butyl acetate. The yield of butyl acetate of 97.85% was attained under the optimum condition as follows ：mole ratio of acetic acid to n-butyl alcohol 1：1.2, La-SO2-/Al-SBA-15catalyst dosage 6% of acetic acid mass, and reaction time 3.5 h.