Co/Al类水滑石催化苯甲醛氧化制备苯甲酸的研究

Studies on the Oxidation of Phenyl Aldehyde to Benzoic Acid Catalyzed by Co/Al HTLcs

采用共沉淀法制备了几种水滑石和类水滑石,并将其用于催化苯甲醛双氧水氧化制备苯甲酸的反应。分别针对水滑石的类型以及催化苯甲醛氧化的工艺条件等进行了摸索。实验结果表明:在不同二元金属组合的水滑石中,Co/Al类水滑石的催化氧化效果最好。对于Co/Al类水滑石而言,当Co/Al摩尔比为2:1时,在苯甲醛25 ml、30%H2O240ml、催化剂0.4g、反应温度60℃、反应时间2 h的条件下,苯甲酸的产率和选择性分别高达99.7%和98.5%。

Different HT and HTLcs were synthesized by coprecipitation, and put use to catalyze the oxidation of phenyl aldehyde with H2O2 to prepare benzoic acid. The effects of different catalysts and reaction conditions were investigated in detail. The results showed that the Co/Al HTLcs had excellent catalytic property in the reaction from phenyl aldehyde to benzoic acid. The yield and selectivity of benzoic acid reached 99.7 % and 98.5 % with the Co/Al （2 ： 1） HTLcs as catalyst, respectively, under the conditions as 60 ℃ , catalyst 0.4 g, phenyl aldehyde 25 mL, 30 % H2O2 40 mL and 2 hours of reaction time.