钨含量对固体超强酸催化剂Pd-SO42-/ZrO2-WO3异构化性能的影响

Effects of W content on the isomerization performance of solid super acid Pd-SO_4^(2-)/ZrO_2-WO_3

为了研究Pd-SO42-/ZrO2-WO3型固体超强酸催化剂的异构化性能,以正戊烷异构化为探针反应,考察了钨(W)含量对催化剂异构化性能的影响。采用X射线衍射(XRD)、FT-IR、H2-TPR、比表面积测定(BET)、热重-差热分析(TG-DTA)和氨-程序升温脱附(NH3-TPD)手段对催化剂进行了表征,分析了WO3含量对催化剂酸性、比表面积、氧化还原能力以及晶体结构的影响。结果表明,当WO3的质量分数为13%焙烧温度为600℃时,Pd-SO42-/ZrO2-WO3固体超强酸催化剂的催化活性最好。在反应温度260℃,压力2.0 MPa,质量空速1.0 h-1,氢油比为4.0时,异物烷产率为40.1%。在80 h内异戊烷收率可稳定在38%左右,选择性在95.3%以上。

The effects of W content on the performance of the Pd-SO42-/ZrO2-WO3 solid super acid catalyst was studied using n-pentane isomerization as a probe reaction and the catalysts were characterized by X-ray diffraction（XRD）,FT-IR,H2-TPR,specific surface area measurements（BET）,thermogravimetry-differential thermal analysis（TG-DTA） and NH3 temperature-programmed desorption（NH3-TPD）.The effects of WO3 content on the acidity,surface area and crystal structure of catalyst were researched.The catalytic activity of the Pd-SO42-/ZrO2-WO3 solid super acid catalyst with a mass fraction of 13% WO3 which was calcinated at 600℃ was found to be the best.At reaction temperature of 260 ℃,space velocity of 1.0 h-1,H2/ n-pentane mol ration of 4.0 and reaction pressure of 2.0 MPa,the iso-pentane yield was 40.1%.The iso-pentane yield was stabilized in about 38% and the selectivity is higher than 95.3%within 80 h.