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AssigneeBASF SE
InventorsDirk A. Grossschmidt, Bilge Yilmaz, Dirk Klingler, Bernd Zoels
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Described is an iron-containing zeolite wherein the number of iron sites, based on the zeolite, is greater than the number of cationic positions in the zeolite. Also described is an iron-containing zeolite preparable by gas phase reaction with iron pentacarbonyl, said zeolite having a greater specific surface area than iron-containing zeolites prepared analogously by ion exchange and/or being more hydrothermally stable than iron-containing zeolites prepared analogously by ion exchange, or wherein the number of iron clusters larger than 10 nm is less than 15% by weight, based on the total amount of iron. Further described is a process for preparing an iron-containing zeolitic material, which comprises doping with iron by means of a gas phase reaction using iron pentacarbonyl. Further described is a process for catalytic reduction of nitrogen oxides using catalysts comprising said iron-containing zeolitic materials.
A process for preparing an iron-containing zeolitic material comprising a topology selected from the group consisting of BEA, CHA, and LEV, the method comprising doping a starting zeolitic material with iron by a gas phase reaction comprising:
Dependencies are inferred from the claim text.