Synergy effects of ZSM-5 addition in fluid catalytic cracking of hydrotreated flashed distillate

被引：34

作者：

den Hollander, MA ^{[1
]}

Wissink, M ^{[1
]}

Makkee, M ^{[1
]}

Moulijn, JA ^{[1
]}

机构：

[1] Delft Univ Technol, Fac Sci Appl, Sect Ind Catalysis, Dept Delft Chem Proc Technol, NL-2628 BL Delft, Netherlands

来源：

APPLIED CATALYSIS A-GENERAL | 2002年 / 223卷 / 1-2期

关键词：

ZSM-5; paraffinic feedstock; gasoline; FCC-catalyst; entrained flow reactor; modelling;

D O I：

10.1016/S0926-860X(01)00746-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effects of ZSM-5 addition in fluid catalytic cracking (FCC) are evaluated, Addition of ZSM-5 to the base catalyst in cracking of a hydrotreated flashed distillate at different residence times has as main result a higher production of LPG-range olefins. The results show that this is not solely caused by cracking of gasoline-range olefins by ZSM-5. ZSM-5 is able to produce LPG-range olefins (and gasoline) by cracking of feedstock-range hydrocarbons, probably after pre-cracking of a part or the paraffinic feedstock by the base catalyst or by thermal cracking. In the presence of the base catalyst, the activity of ZSM-5 for HCO cracking is comparable to the activity of the base catalyst and more than an order of magnitude larger than the activity of pure ZSM-5. Afterwards, when this pre-cracked feedstock has been consumed and significant amounts of gasoline-range olefins have become available, additional LPG-range olefins are produced by cracking of these gasoline-range olefins over the ZSM-5 additive. From a qualitative discussion of the results and a simple kinetic model it was concluded that the synergy is due to a combination of cracking of the feedstock molecules by the base catalyst and subsequently cracking of the olefins produced by the ZSM-5 catalyst. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：103 / 119

页数：17

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