Cerium-modified manganese octahedral molecular sieves as catalysts for selective catalytic reduction

Cerium-modified manganese octahedral molecular sieves as catalysts for selective catalytic reduction

Catalysts and articles useful for selective catalytic reduction (SCR) are disclosed. The catalyst comprises a cerium oxide and an octahedral molecular sieve (OMS) comprising manganese oxide. The catalysts, which comprise 0.1 to 50 wt.% of cerium, can be made by doping, ion-exchange, deposition, or o...

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Bibliographische Detailangaben
Hauptverfasser: THOMPSETT DAVID, FISHER JANET MARY, KILMARTIN JOHN, COLLIER JILLIAN ELAINE, RAJARAM RAJ RAO
Format: Patent
Sprache:eng
Schlagworte:
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
THEIR RELEVANT APPARATUS
TRANSPORTING
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Zusammenfassung:Catalysts and articles useful for selective catalytic reduction (SCR) are disclosed. The catalyst comprises a cerium oxide and an octahedral molecular sieve (OMS) comprising manganese oxide. The catalysts, which comprise 0.1 to 50 wt.% of cerium, can be made by doping, ion-exchange, deposition, or other techniques. Also disclosed is an SCR process in which a gaseous mixture comprising nitrogen oxides is selectively reduced in the presence of a reductant and the cerium-modified OMS catalyst. The cerium-modified manganese oxide OMS catalysts offer unexpected advantages for selective catalytic reduction, especially NH3-SCR, including improved thermal stability and improved activity for NOx conversion, especially at relatively low temperatures (100 DEG C to 250 DEG C).