新型稀土固体超强酸SO_4^(2-)/MnO_2/La^(3+)的合成研究  

Synthesis of Newly Novel Solid Super-acid SO_4^(2-)/MnO_2/La^(3+)

作　　者：舒华[1] 彭丽[1] 姚元勇[1] 唐帮成[1] 周增艳[1] 

机构地区：[1]贵州铜仁学院生化系应用化学研究所,贵州铜仁554300

出　　处：《广州化工》2013年第18期64-66,共3页GuangZhou Chemical Industry

基　　金：贵州省铜仁市科技计划项目铜市科研(2012)63-1;贵州省教育厅重点项目黔教合KY字([2012]069)

摘　　要：以硫酸锰和硝酸镧为原料,采用共沉淀-浸渍法制备不同比例的SO^(2-)_4/MnO_2/La^(3+)。以催化合成乙酸苄酯为探针反应,考察H_2SO_4浓度、La(NO_3)_3的质量分数、焙烧温度、焙烧时间等因素对其催化活性的影响。结果表明,催化剂制备的最佳条件为:硝酸镧的加人为硫酸锰的3%(质量分数),浸渍浓度为1 mol·L^(-1)的H_2SO_4,焙烧温度为450℃,焙烧时间3 h,酯化率到达最大,为89.7%。Newly novel solid super- acid catalyst SO2-/4/Mn0_2/La3＋ was prepared from manganese sulfate and lanthanum nitrate as starting material by means of co - precipitation immersion. The catalytic activity of preparative catalyst was determined through synthesis of benzyl acetate, simultaneously, is affected on proportions of concentration of H2SO4 and mass fraction of La（ NO3 ）3, reacting temperature and reacting time. The results demonstrated that the best condition of preparation of catalyst are 3% MnSO4 in aqueous, 1 mol/L HESO4, 450 ℃ and 3 h. The reaction of benzyl acetate was allowed to afford in the presence of newly catalyst SO2-/4/Mn0_2/La3＋, up to 89.7% in yield.

关 键 词：固体超强酸 催化剂 SO_4^2-/MnO_2/La^3+ 

分 类 号：O643[理学—物理化学]