一种新型的磷化钼加氢精制催化剂的研究

A Novel Molybdenum Phosphide Catalyst for Hydrorefining

通过(NH4)Mo7O24·4H2O和(NH4)2HPO4水溶液沉淀、焙烧在923K用H2还原制得磷化钼催化剂.XRD检测表明,用H2还原后有纯的磷化钼生成.在3.0MPa的高压连续微反系统中测定催化剂的加氢活性.以制备的磷化钼为活性组分、γ-Al2O3为稀释剂,考察了空速、反应温度和反应时间对模型化合物的HDN、HDS和HDY性能的影响,结果表明:在合适的条件下,其脱硫脱氮率可达到90%以上.模型化合物为吡啶、噻吩和环己烯,吡啶含量以N计(为0.2%)、噻吩含量以S计(为0.3%),环己烯含量为20%,以环己烷作溶剂.

A molybdenum phosphide catalyst was prepared from an aqueous solution of (NH4)6Mo7O\{24\}·4H2O and (NH4)2HPO4 by precipitation, calcination, and subsequent reduction in H2 at 923 K. XRD measurements revealed that pure molybdenum phosphide had formed after the reduction in H2. The reactivity study was carried out using 3 g catalyst in a high pressure system at 3.0 MPa. A sample of molybdenum phosphide catalyst diluted with γ\|Al2O3 was used for simultaneous HDN? HDS and HDY. The influences of space velocity, reaction temperature, reaction time on hydrotreating performance were researched. Pyridine, thiophene and cyclohexene were used as model compounds, their contents were 0.2%(N)? 0.3%(S) and 20% respectively. Cyclohexane was used as solvent.