Process for treating nitrogen oxide-containing gas using a cerium zeolite

Process for treating nitrogen oxide-containing gas using a cerium zeolite

Ito, E.
Van den Bleek, C.M.
Van Bekkum, H.
Jansen, J.C.
Hultermans, R.J.
Lugt, P.M.

Applied Sciences

1995-07-06

The invention relates to a process for treating nitrogen oxide-containing gas substantially having a temperature in the range of 300-560 DEG C, for instance exhaust gases of gas engines or off-gases of power plants, in which the gas is passed over a cerium-containing zeolite catalyst in the presence of substantially an excess of a NH-containing compound, for instance ammonia water or an aqueous urea solution, as reducing agent, whereby excess reducing agent is converted to nitrogen gas. The invention also relates to a process for treating exhaust gases of a diesel engine, in which the exhaust gas is passed over a cerium-containing zeolite catalyst in the presence of a NH-containing compound as reducing agent.; The invention further relates to the use of a cerium-containing zeolite catalyst in a selective catalytic reduction process, in which ammonia water or an aqueous urea solution is used as reducing agent, for converting nitrogen oxides in diesel exhaust gas and substantially preventing the oxidation of sulfur dioxide and for converting excess reducing agent

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European Patent Office

http://v3.espacenet.com/publicationDetails/biblio?CC=WO&NR=9517949A1&KC=A1&FT=D&date=19950706&DB=&locale=en_EP

WO 9517949 (A1)

Institutional Repository

patent

(c) 1995 The Author(s)