Although high initial selectivities to propene and ethene could be gained on medium-pore zeolites of ZSM-22, ZSM-23, ZSM-35 and on small-pore zeolite SAPO-34, the stabilities of all these zeolites were poor. This is attributed to a suppression of the hydrogen transfer reaction of the alkenes. ![]() The smaller the pore size of the zeolite catalysts, the higher the initial selectivities towards propene and ethene and the lower the initial selectivities to C3–C4 alkanes. It was found that the porous structure and acidity of zeolites play important roles in the zeolite performance in the butene cracking process. ![]() Catalytic cracking of butene to propene and ethene was carried out in a continuous plug-flow stainless steel reactor over various zeolites with different pore structures and Si/Al2 ratios.
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June 2023
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