Effects of high temperature and high ZSM-5 additive level on FCC olefins yields and gasoline composition

Effect of HZSM-5 catalyst addition on the cracking of polyolefin pyrolysis waxes under FCC conditions

“…Furthermore, the conversion of isoolefins to isoparaffins by hydrogen transfer is severely hindered by shape selectivity and the low acid sites density of the tested samples. The results are consistent with those obtained in the cracking of VGO by several authors [41,42,44,45].…”

“…The results of this paper are consistent with those of VGO cracking [41,42,44]. The values of isoparaffinicity obtained by Buchanan and Adewuyi [45] using hybrid catalysts are very similar to those of the base catalyst. In fact, they are slightly higher for C 5 and slightly lower for C 6 than those obtained here.…”

“…This result is consistent with that of Buchanan and Adewuyi [45] and is contrary to that obtained by Aitani et al [46] by cracking VGO with hybrid catalysts. The difference in the results is attributable, firstly, to the difference in the severity of the equilibration treatment of the hybrid catalysts, which in this paper is very pronounced and, to a lesser degree, the different composition of the feed (as was previously commented for the yields of LPG and gasoline) and the different reaction conditions.…”

“…Consequently, the concentration of linear and branched paraffins in the LPG decreases when hybrid catalysts are used. Contrarily to what Buchanan and Adewuyi [45] obtained in the cracking of VGO, the hybrid catalysts give a higher concentration of butadiene, which increases with temperature.…”

Influence of acidity on the H-Y zeolite performance in n-decane catalytic cracking: evidence of a series/parallel mechanism

“…Fluid catalytic cracking (FCC) is one of the most interesting processes in a modern refinery, not only because it allows the production of important amounts of gasoline and light olefins, but also because it is a very flexible process: the product yields can be easily adapted to the market demand by changing the feedstock, the catalyst composition or the operation conditions [1][2][3]. Catalytic cracking is also envisaged as a possible way to process charges from different sources, including FischerTropsch [4,5] and recycled plastics [6].…”