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The Catalytic Cracking of Hydrocarbons in a Riser Simulator: The Effect of Catalyst Accessibility and Acidity
 

Summary: 1
The Catalytic Cracking of Hydrocarbons in a Riser Simulator:
The Effect of Catalyst Accessibility and Acidity
K.A. Mahgoub and S. Al-Khattaf*
Department of Chemical Engineering, King Fahd University of Petroleum &
Minerals, Dhahran 31261, Saudi Arabia.
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Different catalysts based on Y-zeolite, ZSM-5 and amorphous kaolin were prepared and
characterized. The catalytic cracking of 1,3,5-triisopropylbenzene (1,3,5-TIPB), 1,4-
diisopropylbenzene (1,4-DIPB) and n-dodecane were used to investigate the effect of
catalyst nature on the catalytic performance. Cracking the largest molecule (1,3,5-TIPB)
using the kaolin, with largest pore structure, was found to be most efficient although it
has lowest acidity. On the contrary, cracking of n-dodecane was found to be very
efficient using catalyst based on ZSM-5 zeolite. Koalin catalyst produces more cumene
when used for cracking 1,4-DIPB and 1,3,5-TIPB than the zeolite catalyst. Benzene
selectivity was highest for ZSM-5 catalyst and high reaction temperature. Generally,
cracking of 1,3,5-TIPB produces more coke followed by 1,4 DIPB and least is n-
dodecane. Amorphous kaolin was found to produce less coke than both USY and ZSM-5
zeolites; however kaolin was found completely inactive in cracking n-dodecane.
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Source: Al-Khattaf, Sulaiman - Department of Chemical Engineering, King Fahd University of Petroleum and Minerals

 

Collections: Fossil Fuels; Engineering