caa a22 4500 475844807 CHVBK 20180406123911.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1023/A:1019155832086 doi (NATIONALLICENCE)springer-10.1023/A:1019155832086 Enhanced hydrocarbon cracking activity of Y zeolites [Elektronische Daten] [H.H. Kung, B.A. Williams, S.M. Babitz, J.T. Miller, W.O. Haag, R.Q. Snurr] It has been known for a long time that faujasite zeolites that have been steam‐dealuminated to form USY zeolite are much more active than the unsteamed parent material for hydrocarbon cracking. A popular model to explain this phenomenon is the generation of active sites of unusually high activity. In this paper, a brief review of recent advances towards understanding this phenomenon is presented. Evidence suggests that steaming does not generate sites of new chemical or catalytic properties for cracking. An alternate model is summarized that incorporates a change in the dominant cracking reaction mechanism as a function of conversion, and raises the possibility that the rates of bimolecular and oligomeric cracking are influenced by pore diffusion. Kluwer Academic Publishers, 2000 zeolite Y nationallicence dealuminated zeolite nationallicence USY nationallicence hydrocarbon cracking nationallicence mechanism of hydrocarbon cracking nationallicence diffusion influence on hydrocarbon cracking nationallicence acid site properties of zeolite nationallicence Kung H.H. Department of Chemical Engineering, Northwestern University, 60208‐3120, Evanston, IL, USA aut Williams B.A. Department of Chemical Engineering, Northwestern University, 60208‐3120, Evanston, IL, USA aut Babitz S.M. Department of Chemical Engineering, Northwestern University, 60208‐3120, Evanston, IL, USA aut Miller J.T. BP‐Amoco Chemicals, PO Box 3011, Mail Station E‐1F, 60566‐7011, Naperville, IL, USA aut Haag W.O. Department of Chemical Engineering, Northwestern University, 60208‐3120, Evanston, IL, USA aut Snurr R.Q. BP‐Amoco Chemicals, PO Box 3011, Mail Station E‐1F, 60566‐7011, Naperville, IL, USA aut Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 10/1-2(2000-03-01), 59-64 1022-5528 10:1-2<59 2000 10 11244 https://doi.org/10.1023/A:1019155832086 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1019155832086 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kung H.H. Department of Chemical Engineering, Northwestern University, 60208‐3120, Evanston, IL, USA aut NATIONALLICENCE 700 1- Williams B.A. Department of Chemical Engineering, Northwestern University, 60208‐3120, Evanston, IL, USA aut NATIONALLICENCE 700 1- Babitz S.M. Department of Chemical Engineering, Northwestern University, 60208‐3120, Evanston, IL, USA aut NATIONALLICENCE 700 1- Miller J.T. BP‐Amoco Chemicals, PO Box 3011, Mail Station E‐1F, 60566‐7011, Naperville, IL, USA aut NATIONALLICENCE 700 1- Haag W.O. Department of Chemical Engineering, Northwestern University, 60208‐3120, Evanston, IL, USA aut NATIONALLICENCE 700 1- Snurr R.Q. BP‐Amoco Chemicals, PO Box 3011, Mail Station E‐1F, 60566‐7011, Naperville, IL, USA aut NATIONALLICENCE 773 0- Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 10/1-2(2000-03-01), 59-64 1022-5528 10:1-2<59 2000 10 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer