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通过小型加氢装置对催化剂进行活性评价 ,结果表明 ,失活催化剂经再生后加氢脱氮活性明显降低 ,其反应温度比新鲜催化剂反应温度高 7～ 8℃左右。通过使用XRD、XPS、TPR、ICP、IR等技术 ,测试和表征几种工业大量应用的加氢预处理催化剂 ,从不同角度研究再生前、后催化剂的各种性能的变化 ,研究、探讨催化剂失活的原因。研究表明 ,加氢预处理催化剂经工业使用后 ,导致催化剂失活的原因有 :在运转中碳的沉积使其暂时性失活、重金属沉积堵塞孔口、降低酸度、使催化剂部分活性位永久性失活 ,而金属聚集、载体烧结使催化剂加氢活性降低 ,导致催化剂永久性失活
The activity of the catalyst was evaluated by a small scale hydrogenation unit. The results showed that the activity of the deactivated catalyst after hydrodenitrogenation was significantly reduced, and the reaction temperature was about 7 ~ 8 ℃ higher than the fresh catalyst. Through the use of XRD, XPS, TPR, ICP, IR and other technologies to test and characterize a large number of industrial applications of hydrogenation pretreatment catalyst, from different perspectives before and after regeneration catalyst performance changes, research, explore the catalyst loss The reason for living. The results show that the reason why the catalyst is deactivated after the industrial use of the hydrogenation pretreatment catalyst is as follows: during the operation, the carbon deposition temporarily deactivates the catalyst, the heavy metal deposits clog the orifice, the acidity is reduced, and the active site of the catalyst is permanently Inactivation, while the metal aggregates, the carrier sintering catalyst hydrogenation activity decreased, resulting in permanent catalyst deactivation