Platinum-containing catalyst on a carrier consisting of magnesium oxide and cerium oxide for reduction with hydrogen n2 not able NOx oxidation.

摘要

New catalyst having activity, selectivity and excellent stability for reducing nitric oxide to nitrogen gas with hydrogen as reducing agent in the low temperature range 100-200 ° C and in the presence of excess oxygen (eg 5% vol), H2O (5% vol) and / or SO2 (20 ppm) in the feed. The catalyst consists of platinum crystals in contact with the phases of a mixed MgO and CeO2 medium or in the form of platinum supported on the mixed MgO-CeO2 support previously sulphated selectively. With the catalyst Pt / MgO-CeO2 NO conversion levels above 40% and nitrogen selectivity values ​​above 80% in NOx oxidizing conditions in the temperature range 100-400 ° C are obtained with a time 0045 s surface contact. In particular, full NO conversion and selectivity levels to N2 is obtained of 83% at 150 ° C with a reaction mixture of 0.25% NO / 1% H2 / 5% O2 / 5% H2O / He.