固体超强酸SO_4^(2-)/Fe_2O_3的制备及其对甲缩醛合成反应的催化性能

Preparation of Solid Superacid SO_4^(2-)/Fe_2O_3 and Catalytic Performance for Synthesis of Methylal

以Fe(NO_3)_3、NH_3·H_2O和H_2SO_4为原料,采用直接沉淀法制备了固体超强酸SO_4^(2-)/Fe_2O_3催化剂,用于甲醇与甲醛催化合成甲缩醛的反应。围绕焙烧温度对催化剂催化活性的影响进行了考察,得到了最佳焙烧温度。用X-射线衍射(XRD)、红外光谱(IR)、比表面积(BET)、pH测试等方法对催化剂进行了表征,得到了催化剂比表面积、晶型、活性中心结构等性能参数,使用优化条件下制备的催化剂,反应可得59 wt%甲缩醛的馏出液。

A solid super acid catalyst was prepared from Fe（NO3）3,NH3·H2O and H2SO4 by direct precipitation in the synthesis of dimethoxymethane（DMM） from methanol and formaldehyde.The influence of roast temperature on the activity of the catalyst was investigated and an optimum temperature was obtained.By use of X-ray diffraction（XRD）,infrared spectroscopy（IR）,specific surface area test（BET） and p H value test,SO4^2-/Fe2O3 catalyst was characterized,specific surface area and structure of active center of the catalyst were obtained.The distillate（with 59 wt% of methylal） can be produced by reaction,in which the catalyst was prepared in optimized condition.