一种新型多产柴油降烯烃裂化催化剂的开发

探讨了催化裂化过程降低汽油烯烃含量和多产柴油的反应原理。催化剂的氢转移活性越高，则汽油的烯烃含量越低，同时焦炭产率上升，柴油产牢下降；与低硅ZSM-5相比，高硅ZSM-5的异构化能力强，有利于催化裂化反应中柴油馏分的保留。所研制的新型降烯烃催化剂，在小型固定床装置上的评价结果表明，与对比降烯烃催化剂相比，在不牺牲汽油辛烷值的前提下，降烯烃能力相当，柴油产率增加2．1个百分点，轻油收率增加0．69个百分点，总转化率下降1．72个百分点，表现出良好的焦炭选择性和多产柴油的反应特性。

Development of a novel gasoline olefin reducing and diesel increasing FCC catalyst

The reaction principle of reducing naphtha olefins and increasing diesel oil by FCC process was discussed. The higher the hydrogen transfer activity of catalyst, the lower the FCC naphtha, and in the meanwhile, the coke yield increased and diesel yield decreased. As compared with (ZSM-5) with low ratio of silica to alumina(Si/Al_2), the ZSM-5 with higher Si/Al_2 had great capacity of isomerization, retaining higher diesel yield in catalytic cracking reaction. The (evaluation) of the pilot sample in the small fixed bed showed that the developed novel catalyst had nearly the same performance of reducing olefins with the contrast catalyst, the diesel oil yield increased 2.1%,light oil yield increased (0.69%) and total conversion decreased 1.72%, without any sacrifice in gasoline octane rating while exhibiting good reaction performance of low coke yield and high diesel oil yield.