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Catalytic cracking of n-Dodecane and Alkyl benzenes over FCC Zeolite Catalysts: Time on Stream and Reactant Converted Models
 

Summary: Catalytic cracking of n-Dodecane and Alkyl benzenes over FCC Zeolite
Catalysts: Time on Stream and Reactant Converted Models
Nasir M. Tukur and Sulaiman Al-Khattaf1
Chemical Engineering Department
King Fahd University of Petroleum & Minerals
Dhahran 31261, Saudi Arabia
ABSTRACT
Catalytic cracking of three hydrocarbon model compounds (n-dodecane, 1,3,5-
triisopropylbenzene, and 1,4-diisopropylbenzene) has been investigated over two FCC
zeolite catalysts in a novel riser simulator that resembles closely the operating conditions
of large scale FCC units. The catalytic cracking experiments were carried out at different
reaction times and temperatures using the two FCC zeolite catalysts, FCC-B based on
USY zeolite and FCC-GKF based on ZSM-5. The experimental results were modeled
using quasi-steady state approximation with the catalyst activity decay function based on
both time on stream (TOS) and reactant conversion model (RC). The kinetics for the n-
dodecane cracking as well as for the two alkyl benzenes has been modeled as a first order
process. The higher apparent activation energies of cracking observed over the USY-based
catalyst (FCC-B) for n-dodecane, coupled with the lowest value observed for the same
molecule over the ZSM-5 based catalyst (FCC-GKF), seems to suggest that stronger acid
sites are more important for n-dodecane cracking as compared to alkyl benzenes where

  

Source: Al-Khattaf, Sulaiman - Department of Chemical Engineering, King Fahd University of Petroleum and Minerals

 

Collections: Fossil Fuels; Engineering