Cracking behavior of zeolites with connected 12- and 10-member ring channels: The influence of pore structure on product distribution
- Universidad Politecnica da Valencia (Spain)
- California Institute of Technology, Pasadena, CA (United States); and others
n-Heptane has been cracked on a CIT-1 zeolite which has connected 12- and 10-member ring (MR) channels, and its behavior was compared with that of MCM-22 with nonconnected 12- and 10-MR channels, and SSZ-24 and BETA with unidirectional and tridirectional 12-MR channels, respectively. The kinetic rate constant is highest for CIT-1, and the decay constant is lowest. From the selectivity point of view, its behavior can be better represented by a system with large cavities (the intersections between the 12- and 10-MR) connected by windows. This gives a behavior typical of that of large pore zeolites. CIT-1 produces a remarkably high selectivity to i-C{sub 4}, and specially to isobutane. This zeolite shows promise as an additive in FCC operations. 35 refs., 6 figs., 6 tabs.
- OSTI ID:
- 563482
- Journal Information:
- Journal of Catalysis, Vol. 167, Issue 2; Other Information: PBD: 15 Apr 1997
- Country of Publication:
- United States
- Language:
- English
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