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采用热沉淀法制备了非负载介孔 Co-Mo-Al_2O_3复合氧化物催化剂,利用X射线衍射(XRD)、扫描电子显微镜(SEM)和N_2吸附-脱附等方法分析了焙烧温度和超声振荡对催化剂微观结构的影响,并以苯酚为探针分子,在连续流动固定床反应器上考察了催化剂的加氢脱氧性能。结果表明:非负载介孔Co-Mo-Al_2O_3复合氧化物催化剂具有较窄的孔径分布(最可几孔径3.9 nm)和良好的苯酚加氢脱氧活性;在热沉淀过程中辅以超声振荡可有效控制催化剂的粒径尺寸、均匀度和介孔结构,可使催化剂的比表面积提高约50%,使苯酚的加氢脱氧活性提高约45%。
The unsupported mesoporous Co-Mo-Al 2 O 3 composite oxide catalysts were prepared by thermal precipitation method. The effects of calcination temperature and ultrasonic oscillation on the properties of the catalysts were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and N 2 adsorption-desorption The microstructure of the catalyst was investigated. The hydrodeoxygenation of the catalyst was investigated on a continuous flow fixed bed reactor using phenol as the probe molecule. The results show that the non-supported mesoporous Co-Mo-Al 2 O 3 composite oxide catalyst has a narrow pore size distribution (the most probable pore size of 3.9 nm) and good phenol hydrodeoxygenation activity. Ultrasonic oscillation can be effectively used in the thermal precipitation process Control of the catalyst particle size, uniformity and mesoporous structure, the catalyst can increase the specific surface area of about 50%, the phenol hydrodeoxygenation activity increased by about 45%.