ZSM-5 zeolites with different SiO2/Al2O3 ratios as fluid catalytic cracking catalyst additives for residue cracking

CATEGORY: ZEOLITES 
ZSM-5 zeolites with different SiO2/Al2O3 ratios as fluid catalytic cracking catalyst additives for residue cracking

Type	Journal Article
Author	Pusheng Liu
Author	Zhongdong Zhang
URL	http://www.sciencedirect.com/science/article/pii/S1872206714603119
Volume	36
Issue	6
Pages	806-812
Publication	Chinese Journal of Catalysis
Date	June 2015
Abstract	Describes results of study in which three proton-type ZSM-5 zeolites with various SiO2/Al2O3 ratios (SARs) of 33, 266, and 487 were characterized and examined as fluid catalytic cracking catalyst additives for residue oil cracking. Researchers analyzed the catalytic performance of the ZSM-5 additives using an ultra-stable Y-zeolite (USY)-based fluid catalytic cracking catalyst in a fixed fluid bed unit. The cracking of primary olefins over the hybrid catalysts consisting of USY-based catalyst and ZSM-5 additive was significantly inhibited by increasing the SAR of the ZSM-5 zeolite, thereby 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. Researchers attributed the improved yields to the combined 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 gasoline.