不同硅铝比ZSM-5分子筛作为助催化剂在渣油裂化中的应用（英文）  

ZSM-5 zeolites with different SiO_2/Al_2O_3 ratios as fluid catalytic cracking catalyst additives for residue cracking

作　　者：刘璞生[1,2] 张忠东 贾明君[1] 高雄厚 于吉红[1] 

机构地区：[1]吉林大学无机合成与制备国家重点实验室,吉林长春130012 [2]中国石油兰州化工研究中心,甘肃兰州730060

出　　处：《催化学报》2015年第6期806-812,共7页

基　　金：supported by the National Basic Research Program of China(973 Program,2011CB808703);the National Natural Science Foundation of China(91122029,21320102001)~~

摘　　要：采用不同方法表征了硅铝比(Si O2/Al2O3)为33、266和487的质子型ZSM-5分子筛,并研究了ZSM-5分子筛作为助催化剂在渣油裂解中的应用.与USY分子筛基催化剂混合后,在固定流化床上,评价了ZSM-5分子筛助催化剂的催化裂化性能.研究发现,提高ZSM-5分子筛硅铝比,可以有效抑制混合催化剂对汽油烯烃的裂解,从而避免了汽油烷烃的大量损失.加入ZSM-5助催化剂后,伴随着液化气(LPG)产率的增加,异丁烷和异戊烷产率增加,这可能是由USY基催化剂和ZSM-5助催化剂的综合效应引起的.汽油烷烃和芳烃含量的变化,引起了汽油辛烷值的增加.高硅铝比ZSM-5分子筛(硅铝比为266和487)不仅可以显著改善汽油的辛烷值,而且有效避免了汽油的大量损失.催化汽油辛烷值的改善主要是由于高硅铝比ZSM-5分子筛具有适宜的芳构化和异构化活性,这些变化主要源于高硅铝比ZSM-5分子筛小的孔道直径和适宜的酸性.Three proton-type ZSM-5 zeolites with different SiO2/Al2O3 ratios （SARs） of 33, 266, and 487 were characterized and examined as fluid catalytic cracking catalyst additives for residue oil cracking. The catalytic performance of the ZSM-5 additives was evaluated using an ultra-stable Y-zeolite （USY）-based fluid catalytic cracking catalyst in a fixed fluid bed unit. As observed, the cracking of primary olefins over the hybrid catalysts consisting of USY-based catalyst and ZSM-5 additive was considerably inhibited by increasing the SAR of the ZSM-5 zeolite, thus avoiding substantial loss of gasoline paraffins. The introduction of ZSM-5 additives led to higher liquid petroleum gas yields as well as higher isobutane and isopentane yields. The improved yields were attributed to the com-bined effects of the ZSM-5 additives and USY-based catalyst. The variations of gasoline paraffins and aromatics both accounted for the enhancement in the octane number values. The use of ZSM-5 with higher SARs （266 and 487） led to an enhancement in the octane number with minimal loss of gaso-line. This enhancement was mainly attributed to the moderate aromatization and isomerization reactivity of the ZSM-5 additives that mainly originated from their relatively small pores and suita-ble acidic properties with higher SARs.

关 键 词：催化裂化 ZSM-5分子筛 渣油 辛烷值 

分 类 号：TE624.9[石油与天然气工程—油气加工工程]