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采用浸渍法、沉积-沉淀法、共沉淀法制备了CuO-Bi2O3/SiO2-MgO催化剂,利用低温N2物理吸-脱附、透射电镜(TEM)、X射线衍射(XRD)、H2程序升温还原(H2-TPR)、傅里叶红外(FT-IR)等技术对其进行了表征,并考察了催化剂在甲醛乙炔化合成1,4-丁炔二醇反应中的催化性能.结果表明,制备方法对催化剂中活性组分分散度及还原性能有较大影响,进而在甲醛乙炔化合成1,4-丁炔二醇反应中表现出不同的催化活性.采用共沉淀法制备的催化剂中活性物种CuO具有高的分散度与较好的还原能力,经活化后可生成数量较多的炔铜配合物活性中心,表现出最佳的炔化反应活性与丁炔二醇选择性.
The CuO-Bi2O3 / SiO2-MgO catalysts were prepared by impregnation method, deposition-precipitation method and coprecipitation method. The catalysts were characterized by low temperature N2 physical adsorption-desorption, transmission electron microscopy (TEM), X-ray diffraction H2-TPR) and Fourier transform infrared (FT-IR) were used to characterize the catalytic activity of the catalyst in the synthesis of 1,4-butynediol catalyzed by formaldehyde. The results showed that the preparation method Has great influence on the dispersion and reduction performance of the active components in the catalyst, and then shows different catalytic activities in the reaction of formaldehyde and acetylene to synthesize 1,4-butynediol.The co-precipitation catalyst CuO It has high dispersion degree and good reducing ability. After activation, a large number of active sites of alkyne copper complexes can be formed, showing the best alkyne reaction activity and butynediol selectivity.