固定床渣油加氢处理装置催化剂积炭分析与表征

摘要

利用扫描电镜(SEM)、程序升温氧化(TPO-MS)、CHO元素分析仪等手段,对固定床渣油加氢处理装置催化剂上的积炭进行分析与表征.结果表明,沿着物料方向,渣油加氢催化剂上的积炭量呈先减少后增加的趋势,积炭的H/C原子比逐渐降低,芳香性越来越强,氧化温度逐渐升高.积炭的生成和油品中的氮化物存在着一定关系,含氮原子的沥青质更容易吸附在催化剂酸性位上并形成焦炭.%Coke on spent catalysts from various stages of a commercial fixed-bed hydrotreating unit processing residue feed was characterized by SEM,TPOMS and CHO elemental analyzer. Test results show that following the feed flow direction, the coke contents of catalysts exhibit a trend of firstly decrease then increase, the H/C atomic ratios of coke show decrease trend and oxidation temperatures of coke increase gradually. It is shown that the formation of coke is related with the nitrogen containing compounds of feed in some ways,asphaltene containing nitrogen atom is easy to be adsorbed on the acid sites of catalyst and to form coke further.