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Title: Catalyst for the reduction of NO to Nwith hydrogen under NOx oxidation conditions
Inventor: Efstathiou, Angelos M.
Garcia Fierro, José Luis
Costa, Costas
Keywords: Novel catalyst;Nitric oxide;Gas nitrogen
Category: Earth and Related Environmental Sciences
Field: Natural Sciences
Issue Date: 28-Apr-2005
Abstract: The invention relates to a novel catalyst having excellent activity, selectivity and stability for reducing nitric oxide to gas nitrogen, with hydrogen being used as a reducing agent, in the low temperature range 100–200° C. and in the presence of an excess of oxygen (e.g. 5% vol), H2O (5% vol) and/or SO2 (20 ppm) in the supply. The inventive catalyst consists of platinum crystals which are in contact with the phases of a mixed MgO and CeO2 medium or in the form of platinum supported on the mixed MgO—CeO2 medium which has already been sulphated in a selective manner. The Pt/MgO—CeO2 catalyst can be used to obtain NO conversion levels which are greater than 40% and nitrogen selectivity values of greater than 80% under NOx oxidation conditions in the 100–400° C. temperature range and for a surface contact time of 0.045 s. In particular, full NO conversion is obtained as well as N2 selectivity levels of 83% at 150° C. with a reaction mixture of 0.25% NO/1% H2/5% O2/5% H2O/He.
Rights: Klauber & Jackson
Type: Patents
Classification: Utilizing Solid Sorbent, Catalyst, Or Reactant (423/239.1)
Platinum Group Metal And Of Iron Group (i.e., Ru, Rh, Pd, Os, Ir, Or Pt And Fe, Co Or Ni) (502/326)
Group Ii Metal Containing (i.e., Alkaline Earth, Be, Mg, Zn, Cd Or Hg) (502/328)
Cerium (502/304); Of Group Ii (i.e., Alkaline Earth, Be, Mg, Zn, Cd Or Hg) (502/340)
Miscellaneous (e.g., Carrier Or Support Per Se Or Process Of Making, Etc.) (502/439)
Palladium Or Platinum (502/339)
B01J 23/00 (20060101)
B01J 23/42 (20060101)
B01J 23/44 (20060101)
B01J 21/04 (20060101)
B01J 8/00 (20060101)
Application: 10/915,961
Appears in Collections:Διπλώματα ευρεσιτεχνίας/ Patents

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