预处理方法对Mo-Ni/γ-Al2O3催化剂加氢脱氧性能的影响

采用浸渍法制备了Mo-Ni/γ-Al2O3催化剂,利用BET、XRD、NH3-TPD等方法对还原态和硫化态Mo-Ni/γ-Al2O3催化剂进行了表征,并以模型化合物乙酸和F-T合成轻质油为原料,研究了还原态和硫化态催化剂的加氢脱氧(HDO)性能。结果表明,还原态催化剂具有较大的比表面积和孔体积,活性组分分散度较高;硫化态催化剂的酸性大于还原态催化剂。还原态催化剂具有比硫化态催化剂更好的HDO催化活性,不论是对模型化合物乙酸还是F-T合成轻质油都能获得更高的转化率;但用模型化合物乙酸的研究结果表明,硫化态催化剂不利于C—C键的断裂。

Effect of Pretreatment Methods of Mo-Ni/γ-Al2O3 Catalyst on its Catalytic Performance for Hydrodeoxygenation

Mo-Ni/γ-Al₂O₃ catalysts were prepared by impregnation method and pretreated by reduction or sulfidation, then characterized by BET, XRD and NH₃-TPD. The catalytic reactivities of reduced and sulfided Mo-Ni/γ-Al₂O₃catalysts in the hydrodeoxygenation (HDO) of acetic acid and F-T light oil were evaluated. The results showed that the reduced Mo-Ni/γ-Al₂O₃ catalyst had larger surface area and pore volume as well as higher dispersion of active component than sulfided one, while the acidity of sulfided Mo-Ni/γ-Al₂O₃ catalyst was stronger than that of reduced one. The reduced Mo-Ni/γ-Al₂O₃ catalyst had higher HDO activity, that is, its HDO conversion was higher than that of sulfided catalyst, either for acetic acid or F-T light oil. On the other hand, the sulfided Mo-Ni/γ-Al₂O₃ catalyst was unfavorable for the C—C bond dissociation, which was proved by the HDO reaction of acetic acid.