The concentration of CO2 in the presence of high performance and alkyl aromatic compound and method

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The object of the present invention is to provide a catalyst for preparation of an alkenyl aromatic compound by dehydrogenating an alkyl aromatic compound, a process for preparation thereof, and a method for using it. Under the much carbon dioxide-containing dehydrogenation reaction condition in which CO2is present in a molar ratio of 0.015 to 0.20 based on an aromatic compound in a material gas, as the catalyst being capable of producing the alkenyl aromatic compound in the high yield, the catalyst which comprises an iron and an alkali metal, and comprises about 13 to about 60 % by weight of a rare earth element calculated as an oxide is contacted with a reaction gas.