MCM-41作载体制备磷化钼加氢脱硫催化剂

PREPARATION OF MCM-41 SUPPORTED MOLYBDENUM PHOSPHIDE HYDRODESULFURIZATION CATALYST

通过原位还原方法制备了MCM-41担载的MoP催化剂并用TPR和XRD方法对其进行了表征。选用二苯并噻吩(DBT)作模型化合物,考察了催化剂的加氢脱硫(HDS)反应活性和产物分布。结果表明,MoP/MCM-41催化剂的HDS反应活性明显高于MoP/Al2O3催化剂,从加氢脱硫产物分布看,DBT在MoP/Al2O3催化剂上主要通过直接脱硫路径脱硫,而在MoP/MCM-41催化剂上,直接脱硫和预加氢脱硫路径都发挥了重要作用。由中性和碱性浸渍液制备催化剂的HDS活性相当,高于用酸性浸渍液制备的催化剂。

MCM-41 mesopore molecular sieve supported molybdenum phosphide catalyst was prepared by in-situ reduction method. The prepared catalysts were characterized by TPR and XRD. The hydrodesulfurization（HDS）activity and product distribution of the catalysts were studied using a model fuel,0.8% dibenzothiophene（DBT）in decalin. The results showed that as compared with MoP/Al2O3 catalyst, MoP/MCM-41 catalyst possessed higher HDS activity. The distribution of HDS products suggested that over MoP/Al2O3 catalyst direct desulfurization was the dominating reaction route, and over MoP/MCM-41 catalyst both hydrogenolysis and pre-hydrogenation reactions played important roles. The effec investigated. It exhibited highe t of impregnation was found that r pH value on the HDS activity of MoP/ MoP/MCM-41 catalysts impregnated by MCM-41 catalysts was also basic or neutral solutions HDS activity than those catalysts impregnated by acidic solutions.