F127稳固Pd纳米粒子催化剂催化油酸甲酯加氢反应的研究

摘要

制备了F127稳固Pd纳米粒子催化剂(Pd/F127),并将其用于油酸甲酯加氢制备C18醇的反应.结果表明:F127稳固Pd纳米粒子催化体系对油酸甲酯加氢反应具有催化活性高、稳定性好、易与产物分离、可循环利用等特性;在油酸甲酯用量3.0 g、Pd质量分数0.36％的Pd/F127催化体系用量6.0 g(m(Pd)∶m(F127) =1∶25)、反应温度230℃、氢气压力6 MPa、反应时间8h的较佳实验条件下,产物羟值(KOH)和碘值(I)分别为173.3 mg/g、10.5 g/100 g;Pd/F127分散均匀,Pd纳米粒子平均粒径2.36 nm;分离所得稳固Pd纳米粒子催化体系不经任何处理重复使用5次后,仍有较好的催化活性.%Pd nanoparticles catalyst stabilized by F127 were prepared,and were used to catalyze the hydrogenation of methyl oleate to prepare stearyl alcohol.The results showed that the catalytic system Pd/F127 had high catalytic activity and good stability,as well as,easy to be separated from products and recycled availably.The better reaction conditions were obtained as follows:dosage of methyl oleate 3.0 g,dosage of catalytic system Pd/F127 (mass fraction of Pd 0.36％,m(Pd) ∶ m(F127) =1∶25) 6.0 g,reaction temperature 230 ℃,hydrogen pressure 6 MPa and reaction time 8 h.Under these conditions,the hydroxyl value and iodine value of the product were 173.3 mgKOH/g and 10.5 gI/100 g,respectively.The Pd/F127 distributed uniformly and the average particle size of Pd nanoparticles was 2.36 nm.Otherwise,the separated catalytic system of Pd nanoparticles stabilized by triblock copolymer F127 had better catalytic activity when it was reused for five times without treatment.