复合载体TiO2-Al2O3的制备及其对Ni-Mo-S负载型催化剂加氢脱氧性能的影响

采用共沉淀法制备出复合载体TiO₂-Al₂O₃，用N₂-吸附、XRD和吡啶吸附红外光谱等手段进行表征。采用原位硫化法制备Ni-Mo-S/TiO₂-Al₂O₃负载型催化剂，以苯酚为模型化合物研究其加氢脱氧催化性能。主要研究铝源和沉淀剂对TiO₂-Al₂O₃复合载体性能的影响以及其作为载体对Ni-Mo-S/TiO₂-Al₂O₃催化苯酚加氢脱氧反应的影响。结果表明，以氯化铝为铝源制备的复合载体具有较大的孔容和孔径，孔容达1.12cm³/g，孔径达18.0nm；以硫酸铝为铝源和以碳酸氢铵为沉淀剂制备的复合载体具有较大的比表面积，高达295m²/g；氨水沉淀制备的复合载体具有较多的L酸；以硫酸铝为铝源制备的复合载体形成少量的B酸。TiO₂-Al₂O₃作为载体影响Ni-Mo-S/TiO₂-Al₂O₃负载型催化剂加氢脱氧性能的主要因素是载体的酸性和载体的比表面积。在300℃，4.0MPa条件下Ni-Mo-S/TiO₂-Al₂O₃催化苯酚的转化率达81.9%，产物中无氧化合物的总选择性达100%，脱氧率达79.4%。

Preparation of TiO_2-Al_2O_3 composite support and its performance in catalystic hydrodeoxygenation

TiO2-Al2O3 composite supports were prepared by co-precipitation method and characterized by N2 physisorption,X-ray diffraction(XRD) and pyridine adsorption FT-IR spectroscopy.Ni-Mo-S/TiO2-Al2O3 supported catalysts were prepared with in-situ sulfidation method and their hydrodeoxygenation(HDO) properties were tested using phenol as model compound.The effects of aluminum sources and precipitants on the properties of TiO2-Al2O3 composite supports and the effects of support properties on the HDO properties of N...