机构地区: 湖南理工学院化学化工学院
出 处: 《合成化学》 2005年第1期83-85,88,共4页
摘 要: 硫酸钛掺杂La2O3后经高温焙烧制得一种新型固体酸催化剂。用环己酮缩乙二醇反应表征其催化活性的反应条件为环己酮200mmol,n(环己酮)∶n(乙二醇)=1.0∶1.5,带水剂环己烷15mL,硫酸钛催化剂[w(La2O3)0.05,400℃焙烧3h]用量4.1%(以环己酮质量计),回流分水1h,收率94.5%。结果表明,催化活性随La2O3含量的增加而升高,随焙烧温度的升高而降低。催化剂吸附吡啶的红外光谱证实催化剂表面存在明显的Brnsted酸中心和Lewis酸中心。该催化剂对其它缩醛(酮)反应也有催化活性。 A new type of solid acid catalyst was prepared by calcination of titanium sulphate doped La_2O_3. The catalytic activity was determined by acetal(ketal) reaction between cyclohexanone and glycol. The reaction conditions with yield of 94.5% were as follows: cyclohexanone was 200 mmol, n(cyclohexanone) ∶n(glycol) was 1 ∶1.5, cyclohexane as a water-carrying agent was 15 mL, catalyst[w(La_2O_3) 0.05, calcination temperature 400 ℃ for 3 h] amount was 4.1% based on the mass of cyclohexanone, refluxing time was 1 h. The result showed that the catalytic activity increased with rising of La_2O_3 content and decreased with increasing of calcination temperature. The Brnsted acid centers and Lewis acid centers on the catalyst surface were confirmed by IR spectra of pyridine adsorbed on the catalyst. The titanium sulphate doped La_2O_3 can be used as a catalyst in other acetal(ketal) reactions.