METHOD FOR PRODUCING LOWER OLEFIN

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A method for producing a lower olefin, wherein a hydrocarbon material having two or more carbon atoms is subjected to a catalytic cracking in a fixed bed reactor packed with a catalyst, characterized in that crystalline aluminosilicate zeolite containing a rare earth element is used as a catalyst, said catalyst has a size of 14 mesh (1.2 mm) or greater, and the pressure loss due to the catalyst layer in the reactor is suppressed to 0.02 MPa or less. The method can be suitably employed for producing lower olefins such as ethylene and propylene with a high yield over a long period of time, in the catalytic cracking of a hydrocarbon material by the use of a crystalline aluminosilicate zeolite catalyst having a rare earth element carried thereon.