Abstract: Based on the analysis on composition characteristics，diffusion and adsorption performance of naphtha over zeolite catalysts, the experiments of naphtha cracking over zeolite catalysts were conducted in a laboratory fixed fluidized bed reactor. The influence of reaction temperature, residence time and microactivity of catalysts on product slate was explored. The results indicate that naphtha, which is rich in small saturated hydrocarbons, shows less pore diffusion limitation, weak adsorption ability in the typical zeolite catalysts, and high reaction activation energy in catalytic cracking. Thus, several conceptions that naphtha catalytic cracking reaction could be promoted effectively by developing hierarchical porous structure zeolites, improving adsorption performance of small saturated hydrocarbons and adopting high severity reaction conditions are proposed.

Key words: naphtha , catalytic cracking, ethylene, propylene, reaction temperature, contact time, catalyst activity