再生气氛对HDN催化剂再生性能的影响  

INFLUENCE OF REGENERATION MEDIUMS ON PROPERTIES OF REGENERATED HDN CATALYST

作　　者：杜明仙[1] 朱华青[1] 李源[1] 程昌瑞[1] 

机构地区：[1]中国科学院山西煤炭化学研究所

出　　处：《燃料化学学报》1998年第4期307-312,共6页Journal of Fuel Chemistry and Technology

摘　　要：采用不同手段研究了催化剂反应前后及在Ｈ２Ｏ和Ｎ２介质中再生时催化剂性质和表面原子浓度及其分布的变化。ＢＥＴ结果表明，Ｎ２介质中再生，催化剂的孔径基本没有变化，而Ｈ２Ｏ介质中再生的催化剂孔径明显增大。化学组成分析结果说明，长期运转使用后的催化剂在Ｎ２和Ｈ２Ｏ介质中再生后其活性组分均有少量流失。电子探针的结果表明，结炭后的催化剂活性组分很不均匀，在Ｎ２和Ｈ２Ｏ介质中再生后其分布得到了明显改善，但仍不如新鲜催化剂分布得均匀。ＸＲＤ谱图的结果说明，Ｎ２介质和Ｈ２Ｏ介质再生的催化剂其晶相是完全相同的，由于再生过程使催化剂表面的Ｍｏ和Ｎｉ之间的相互作用增强了，形成了类钼酸镍的新晶相。ＸＰＳ的电子结合能数据和催化剂再生前后Ｍｏ物种的解析拟合结果都表明，Ｎ２介质对催化剂组成结构的恢复比Ｈ２Ｏ介质好。因此，对于工业装置的ＨＤＮ催化剂的再生，推荐采用氮气空气法。The different means have been applied to study the changes of catalyst properties, atom concentration and its distribution on surface for fresh and used regenerated catalysts by H 2O and N 2 BET results show that the pore diameter of catalyst is not changed by N 2 regeneration, but increased largely by H 2O The analysis of chemical compositions indicates that active components of long run catalyst have a few loss by N 2 and H 2O regeneration Electronprobe results demonstrate that the dispersion of catalyst active phase is very inhomogeneous and was improved obviously after regeneration, but regenerated catalysts are not better than fresh XRD results illustrate that crystalline phases of regenerated catalysts by both N 2 and H 2O are complete identical, because the interaction of Mo and Ni on catalyst surface is intensified by regeneration, and new crystalline phase such as analogous NiMoO 4 appears It is shown that catalyst structure by N 2 regeneration is better than that by H 2O based on XPS results of electron binding energy and Mo fitting curve analysis Therefore N 2Air medium is recommended for HDN catalyst regeneration in industrial operation

关 键 词：加氢精制 催化剂 HDN 再生气氛 

分 类 号：O643.36[理学—物理化学]