Supported catalyst prodn. used for denitrification of waste combustion gas - by coating pretreated support from gas phase and after treatment to convert coating to catalytically active material

摘要

Prodn. of supported catalysts (I) comprises (1) thermal pretreatment of the support (II); and (2) deposition of coating material (III) from the gas phase; followed by (3) first after-treatment to convert (III) to catalytically active mateiral; and (4) second after-treatment to proudce (I). Pref. (II) consists of metal oxide(s), pref. Al2O3, rutile, anatase, Cr oxide, SiO2 and/or ZrO2 in granular or monolithic form; and (III) of organometallic cpds. and/or metal alkoxides, pref. of transition metals, esp. V oxytriisopropoxide (IIIA). USE/ADVANTAGE - (I) is made for eliminating NOx gases from waste combustion gas (IV) (claimed). Thin homogenous coatings are obtd., in which individual mols. are anchored to the surface of (II), so that costly (III) is saved.