固体超强酸S_2O_8^(2-)/TiO_2-ZrO_2催化合成三氟甲基硝基苯

Synthesis of nitrotrifluorobenzene by solid superacid catalyst S_2O_8^(2-)/TiO_2-ZrO_2

以固体超强酸S2O82-/TiO2-ZrO2为催化剂,浓硝酸为硝化剂对三氟甲苯进行硝化,考察催化剂的制备条件对催化活性的影响,以及反应时间、催化剂用量等因素对硝化反应的影响.结果表明:将TiO2-ZrO2用0.75 mol/L(NH4)2S2O8溶液浸泡12 h,并在600℃条件下焙烧3 h,可得到较高的催化活性;当固体超强酸催化剂S2O82-/TiO2-ZrO2用量为三氟甲苯质量的15%,反应4 h,三氟甲苯的转化率可达68.7%以上;催化剂具有较好的重复使用性能.

The nitration of benzotrifluorede using solid superacid S2O8^2-/TiO2-ZrO2 as catalyst and nitric acid as nitrating agent was studied,the effects of preparation condition of catalyst on catalytic activity and reaction time,amount of catalyst S2O8^2-/TiO2-ZrO2 on the nitrating yield were investigated.The results showed that the S2O8^2-/TiO2-ZrO2 catalyst prepared with the concentration of（NH4）2S2O8 by 0.75 mol/L and the calcinated at 600 ℃ for 3 h,the catalytic activity of catalyst was the highest;It was founded that the nitrating yield could may up to 68.7% when amount of S2O8^2-/TiO2-ZrO2 is 15% of reactant and reaction time is 4 h;The catalyst has good reusability.