摘要
通过低温陈化法制备了固体超强酸SO_4^(2-)/SnO_2-Al_2O_3催化剂,并以乙二醇丁醚乙酸酯(BGA)的合成为评价反应,考察了制备条件对催化剂活性的影响,得到了较佳的制备条件:n(Sn):n(Al)=9,陈化温度0℃,陈化时间24h,浸渍液(硫酸)浓度1.0mol/L,浸渍液用量15mL/g(基于SnO_2-Al_2O_3载体的质量),焙烧温度500℃。将该催化剂用于合成BGA,在n(乙二醇丁醚):n(乙酸)=1.2:1、m(催化剂):m(反应物)=0.024、m(环己烷):m(反应物)=0.3、反应时间4h的条件下,BGA收率为97.8%。催化剂重复使用5次后,BGA收率为88.6%,高于未添加Al的SO_4^(2-)/SnO_2催化剂。失活后的SO_4^(2-)/SnO_2-Al_2O_3催化剂经焙烧后活性可完全恢复。
Solid super acidic SO4^2-/SnO2-Al2O3 catalyst was prepared through low-temperature aging and impregnation. Effects of preparation conditions on the catalyst activity in synthesis of butyl glycol acetate （BGA） from 2-butoxyethanol and acetic acid, as a probe reaction, were investigated. The optimal conditions for preparation of SO2-/SnO2-Al2O3 catalyst were n （Sn）： n （Al） 9, aging temperature 0 ℃, aging time 24 h, concentration of impregnating solution （ sulfuric acid） 1.0 mol/L, impregnating solution dosage 15 mL/g （based on mass of SnO2-Al2O3 support） and calcination temperature 500 ℃. Yield of BGA over the SO42-/SnO2-A1203 catalyst could reach 97.8% under the reaction conditions ： n （2-butoxyethanol） ： n （ acetic acid） 1.2 ： 1, m （catalyst） ： m （reactants） 0. 024, m（cyclohexane） ： m（reactants） 0.3 and reaction time 4 h. Catalytic activity of the SO4^2-/SnO2-Al2O3 catalyst reduced to 88.6% after being reused five times. Introduction of alumina prolonged the life of the SO42-/SnO2 type solid super acidic catalyst. Activity of the deactivated SO4^2-/SnO2-Al2O3 catalyst could be recovered after calcination.
出处
《石油化工》
CAS
CSCD
北大核心
2010年第5期548-552,共5页
Petrochemical Technology
