膨胀床预硫化加氢催化剂表征

利用SEM,XRD,DTA,TGA,TPD,TPR等对硫化态、氧化态和钝化态的催化剂进行表征,同时对催化剂孔结构、催化剂强度进行分析。结果表明,硫化态催化剂经过钝化处理后,其规整的形态发生变化,钝化态催化剂上的氧化物衍射峰有所增加。钝化态催化剂的放热峰比硫化态催化剂放热峰低得多,也比较平坦;钝化态催化剂高温下有SO2生成;催化剂的强酸中心由强至弱的顺序为:钝化态>硫化态>氧化态;钝化态催化剂与硫化态催化剂相比,孔体积和孔径相近,比表面积变化不大;催化剂经过钝化后活性组分发生了变化,有新相生成,同时可改善催化剂的低温热稳定性。

CHARACTERIZATION OF HYDROGENATION CATALYST PRESULFIDED AND PASSIVATED IN AN EXPANDED BED REACTOR

Hydrotreating catalysts in various states including sulfided,passivated and oxidated,were characterized by techniques such as SEM,XRD,DTA,TGA,TPD and TPR.For passivated catalyst,lower exothermic peak was observed in DTA curve as compared with the sulfided catalyst,and SO2 was detected in TGA curve.The pyridine-TPD results indicated that strong acid strength of these three types of catalysts were in the order of passivated>sulfided>oxidated.Measurements of pore structure and specific surface area of passivated and sulfided catalysts indicated no significant change.The active components on the catalysts were altered during passivation,and some new phases were formed.Thus,the thermal stability of the catalyst at low temperature was improved.