IRON ZEOLITES, METHOD FOR PRODUCING IRON ZEOLITES, AND METHOD FOR CATALYTICALLY REDUCING NITROGEN OXIDES

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.