Dehydrogenation catalyst for alkyl aromatic compounds exhibiting high performance in the presence of high-concentration CO₂

摘要

A dehydrogenation catalyst composition for use in preparing an alkenyl aromatic compound by dehydrogenation of an alkyl aromatic compound, a method for preparing the catalyst, and a process for using the catalyst in a dehydrogenation reaction. Carbon dioxide (CO2) is present in the reaction in a molar ratio of 0.015 to 0.20 based on an aromatic compound in a material gas. The catalyst further includes an iron compound, an alkali metal, and about 13 to about 60 wt % of a rare earth element calculated as an oxide.

主权项

1. A method for dehydrogenation of an alkyl aromatic compound, comprising the steps of:
mixing a first gas comprising hydrogen, steam, and the alkyl aromatic compound with a second gas comprising oxygen to form a gas mixture, wherein at least some of said hydrogen is oxidized and carbon dioxide is produced; and contacting said gas mixture with a reaction gas comprising a dehydrogenation catalyst to produce an alkenyl aromatic compound, wherein said reaction gas comprises steam and carbon dioxide, said carbon dioxide being present in a molar ratio from about 0.015 to about 0.20 based on all aromatic molecules in the reaction, and wherein said dehydrogenation catalyst comprises from about 30 to about 86 wt. % of an iron compound calculated as Fe2O3, from about 1 to about 50 wt. % of an alkali metal calculated as an alkali metal oxide, and about 13 to about 60 wt. % of a rare earth element calculated as an oxide, wherein all weight percents are based on the total weight of the catalyst.