Study of the cracking mechanism of n-hexane over zeolites II. Bimolecular hydride transfer reaction proceeds via rideal mechanism

The cracking of n-hexane over the two series zeolites, Y and β, was studied. By means of measuring the initial producing rates for the some primary products, a well linear correlation was found between these initial rates and acid site density of zeolite. Additionally, compared to structure pore diameter of zeolites, variety of acid site density didn't exert a significant effect on the cracking chain length of n-hexane. The result showed that bimolecular hydride transfer reactions occurred on single acid site of zeolite surface just like monomolecular reactions. On this basis,a conclusion is proposed that bimolecular reactions in the cracking of n-hexane proceeded via Rideal mechanism.