Premium
Deactivation of cracking catalyst in short contact time reactors: Alternative models
Author(s) -
Kraemer D.,
De Lasa H. I.,
Larocca M.
Publication year - 1991
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450690143
Subject(s) - coke , cracking , fluid catalytic cracking , catalysis , exponential function , exponential decay , work (physics) , function (biology) , mechanics , power law , chemistry , thermodynamics , physics , mathematics , nuclear physics , mathematical analysis , organic chemistry , statistics , evolutionary biology , biology
Several mathematical models have been used to describe the deactivation of cracking catalysts by coke. For the case of gas oil cracking under short contact times (less than 20 seconds) it was found, using data from two different experimental reactor units, that an exponential decay function or a power law function could equally represent the data. Both functions are forms of the general hyperbolic decay expression; however, the power law assumes the unrealistic limits of infinite catalyst activity at zero time‐on‐stream and requires two parameters to describe deactivation. This work shows that the simple first order decay function is an effective equation to be used in describing catalyst activity decay for short reaction times.