Selective catalytic reduction of NO{sub x} with methane

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:142003

Li, Y; Armor, J N ^[1]

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1. Air Products and Chemicals Inc., Allentown, PA (United States)

The authors discovered a catalytic process that efficiently reduces NO{sub x} with CH{sub 4} in the presence of excess O{sub 2}. The new process provides an alternative approach for NO{sub x} control in the presence of excess O{sub 2} for both stationary and mobile sources. A complete conversion of NO to N{sub 2} was obtained over a Co-ZM-5 catalyst at 400{degrees}C. In fact, the presence of O{sub 2} in the feed significantly enhanced the NO{sub x} reduction activity. The catalytic activity for NO{sub x} reduction is proportional to the CH{sub 4} level in the feed and the level of Co2+ exchanged into the zeolite, Co2+ exchanged zeolite Y, however, is a poor catalyst compared to Co-ZSM-5, and CoO/Al{sub 2}O{sub 3} inactive for this reaction. On the other hand, Cu-ZSM-5, which is a unique catalyst for the direct NO decomposition, is much less active for the NO reduction by CH{sub 4} in the presence of excess O{sub 2}. In this presentation, the basic features of this catalytic process, the role of zeolite and the importance of metal center for an active catalyst will be discussed.

• OSTI ID: 142003
• Report Number(s): CONF-930304--
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COBALT IONS
COPPER IONS
METHANE
MOBILE POLLUTANT SOURCES
NITROGEN OXIDES
SELECTIVE CATALYTIC REDUCTION
STATIONARY POLLUTANT SOURCES
ZEOLITES