CAJ | 학술논문

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℃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.
대전통공침정법진행개진,재노화계단통입CO2촉진모액중전구체물상적전변,제비료Cu/ZnO/Al2O3최화제.N2흡부、X 사선연사、장발사소묘전자현미경、정서승온환원、정서승온분해결과표명,개진공침정법제비적최화제전구체중감식초산동경역전변위감식탄산동,종이제고료전구체적은정성,병사득배소후적최화제구유교대적비표면적화공체적급교소적과립.재200～260℃범위내대CO2가경제갑순활성측시표명,개진방법제비적최화제활성명현우우전통공침정법제비적최화제.
A Cu/ZnO/Al2O3 catalyst prepared by adding CO2 during the aging step was used for methanol synthesis from CO2 and H2.The catalysts were characterized by N2 adsorption-desorption,X-ray diffraction,field emission scanning electron microscope,temperature-programmed decomposition,and temperature-programmed reduction.The precursor from the modified method with added CO2 had malachite and hydrotalcite-like phases and was more stable than that of the sample without added CO2.After calcination,the modified catalyst had a higher surface area,larger pore volume,and smaller particle size.The modified catalyst gave a higher activity for methanol synthesis from CO2 hydrogenation in the reaction temperature range of 200-260℃.