络合作用对重油加氢处理催化剂性能的影响

以Ni、W为催化剂的活性金属组分,考察在金属组分浸渍液中加入有机络合剂对催化剂性质及加氢脱硫、脱氮性能的影响。结果表明,络合剂与金属组分共浸渍更有利于金属组分的分散;提高络合剂用量,既有利于提高主活性金属组分WO₃在载体表面的分散,又能促进六配位八面体Ni物种及高加氢活性相NiWO₃的形成;焙烧温度具有调变催化剂金属组分分散性及酸性的双重作用,在适宜的焙烧温度下制得的催化剂具有较好的酸性及加氢活性,主要表现为较高的加氢脱硫及脱氮活性。

Effect of complextion on the performance of heavy oil hydrotreating catalysts

The hydrotreating catalysts were prepared using Ni and W as active metals.The dispersity and sulfuration of the active metals were adjusted by adding organic modifiers to the Ni and/or W impregnation solution.Based on the experimental results,it was found that the dispersity of the active metals on the catalyst support was improved with organic modifiers dissolved in Ni and/or W impregnation solution.And increasing the amount of organic modifiers can not only increase the dispersity of main active phase WO3 on the support,but also promote the formation of highly active nickel species in octahedral sites and of high hydrogenation phase NiWO3.The calcination temperature can adjust the dispersity of active metals and acidity of the catalysts.The catalysts treated at optimized calcination temperature have appropriate ratio of weak and strong acidity sites and better hydrodesulfuration and hydrodenitrofication performance.