通过超声等体积浸渍法制备了一系列MoO₃·NiO/Al₂O₃催化剂,利用XRD、H₂-TPR、BET等表征手段对催化剂的质构特性进行表征分析,并对MoO₃·NiO/Al₂O₃催化萘选择性加氢转化为四氢萘的催化性能进行了考察。结果表明,随着催化剂中MoO₃/NiO质量比的提高,Mo⁶⁺及Mo⁴⁺的H₂-TPR还原峰向高温区偏移,表明催化剂的加氢活性减弱,萘加氢生成四氢萘的选择性也得到明显提高;MoO₃/NiO质量比对催化剂的孔容及孔径影响不大。在温度为300℃、压力为3.0 MPa、空速为 2.0 h^-1、氢油体积比为120的反应条件下,7MoO₃·NiO/Al₂O₃催化萘的转化率可达98.14%,产物四氢萘的选择性可达96.8%。

A series of MoO₃·NiO/Al₂O₃ catalysts are prepared through ultrasonic volume impregnation,and characterized by means of XRD,H₂-TPR,BET and other characterization methods.Their catalytic performance is evaluated in catalytic hydrogenation of naphthalene to tetrahydronaphthalene.Characterization results show that H₂-TPR reduction peaks of Mo⁶⁺ and Mo⁴⁺ shift toward high-temperature zone when the ratio of MoO₃/NiO in the catalyst increases,indicating that the hydrogenation activity of the catalyst weakens and the selectivity tetrahydronaphthalene also improves significantly.The ratio of MoO₃/NiO in the catalyst has hardly effects on the pore volume and pore size of the catalyst.The conversion of naphthalene reaches 98.14% and the selectivity of tetrahydronaphthalene exceeds 96.8% when 7MoO₃·NiO/Al₂O₃ serves as catalyst,reaction temperature is at 300℃,reaction pressure is 3.0 MPa,VHSV is 2 h^-1,and the ratio of hydrogen to naphthalene is 120.

李松洋(1996-),男,硕士研究生,研究方向为加氢催化剂,15692163805@163.com