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Research Article


ScienceAsia 15 (1989): 191-201 |doi: 10.2306/scienceasia1513-1874.1989.15.191

 

MOMENTARY MATERIAL BALANCE FOR ZEOLITE DEACTIVATION OF N-DODECANE CATALYTIC CRACKING

 

ATTERA WORAYINGYONO*

ABSTRACT: The deactivation of zeolite can be explained by the method of momentary material balance. In this case, the catalytic cracking of n-dodecane on Y-zeolite at 723 K and 200 kPa, with neopentane as a reference substance, was used as a model. The amount of coke and the selectivity of cracked products were determined as a function of time-on-stream. For the comparison of catalyst deactivation process, the propane/propene mole ratio was considered together with the rate of coke formation, both of which decreased rapidly. In addition, the number of moles of aromatic compounds have been investigated in order to provide more understanding of the structures of cokes.

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Engler-Bunte Institute, University of Karlsruhe, 7500 Karlsruhe, Federal Republic of Germany.

Received 12 April 1989