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对传统共沉淀法进行改进,在老化阶段通入CO2促进母液中前驱体物相的转变,制备了Cu/ZnO/Al2O3催化剂.N2吸附、X射线衍射、场发射扫描电子显微镜、程序升温还原、程序升温分解结果表明,改进共沉淀法制备的催化剂前驱体中碱式硝酸铜更易转变为碱式碳酸铜,从而提高了前驱体的稳定性,并使得焙烧后的催化剂具有较大的比表面积和孔体积及较小的颗粒.在200~260°C范围内对CO2加氢制甲醇活性测试表明,改进方法制备的催化剂活性明显优于传统共沉淀法制备的催化剂.
The traditional coprecipitation method was improved, CO2 was introduced into the mother liquor to promote the precursor phase transformation during the aging process, and Cu / ZnO / Al2O3 catalyst was prepared.N2 adsorption, X-ray diffraction, field emission scanning electron microscopy, temperature programmed reduction, The results of programmed pyrolysis showed that the basic copper nitrate in the catalyst precursor prepared by the improved coprecipitation method can be more easily converted into basic copper carbonate to improve the stability of the precursor and make the calcined catalyst have a larger specific surface area and Pore volume and smaller particles.The methanol activity test of CO2 hydrogenation in the range of 200-260 ° C shows that the catalyst prepared by the improved method is obviously superior to the catalyst prepared by the traditional coprecipitation method.