NaZSM\|5 and Na Y zeolites are pulverized by air stream to obtain fine particles,whose particle size distribution becomes narrower, and the contents of large particles decrease significantly. From XPS research of the pulverized zeolites, it can be seen that some of the atoms, on the external surface fall off, the electron binding energies of O, Si, Al increase, and the surface Al atoms become more homogeneous. Catalytic activities of pulverized zeolites for cumene cracking increase also.
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