Prediction of cracking catalyst behavior by a zeolite unit cell size model

Journal Article · Wed Feb 01 04:00:00 EST 1984 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(84)90235-5· OSTI ID:7127051

Pine, L A; Maher, P J; Wachter, W A

An experimental and theoretical study of the behavior of metal, hydrogen-exchanged Y and USY zeolite cracking catalysts has been conducted. From the experimental program, data on zeolite stability as well as catalyst activity and selectivity were obtained. Using a new theoretical framework for zeolite acidity, it was found that these data could be correlated against a single parameter, the unit cell constant of the steam deactivated catalyst. The cell constant is a measure of the silica to alumina ratio actually in the zeolite crystal structure. This ratio is a measure of acid site density which determines the acid strength distribution and ultimately affects activity and selectivity. The data clearly show that activity and selectivity changes resulting from various zeolite pretreatments such as cation exchange, acid extraction, and hydrothermal conditioning can be explained in terms of the effect on the zeolite cell constant. A logical extension of the acid site distribution theory is demonstrated by the influence of soda level on the performance of catalysts having the same cell constant.

• Research Organization: Exxon Research and Development Lab., Baton Rouge, LA
• OSTI ID: 7127051
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 85:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CRACKING
DATA
DECOMPOSITION
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
NUMERICAL DATA
PETROLEUM
PYROLYSIS
RARE EARTH COMPOUNDS
SIMULATION
THERMOCHEMICAL PROCESSES
ZEOLITES