CoPt clusters in NaMordenites as catalysts for SCR of NO{sub x}

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:468004

Gutierrez, L; Ribotta, A; Boix, A; Petunchi, J ^[1]

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1. Instituto de Investigaciones en Catalisis Petroquimica, Santa Fe (Argentina)

A new material based on Pt and Co exchanged in Na Mordenite for the selective catalytic reduction (SCR) of nitric oxide with methane in the presence of excess oxygen is studied. The incorporation of 0.5% weight of Pt and 2% weight of Co to the zeolitic matrix after calcination and reduction on H{sub 2} flow for 1 h yields a solid converting 100% of NO to N{sub 2} and, simultaneously, 100% of CH{sub 4} to CO{sub 2} with a CH{sub 4}/NO ratio = 3 and 2% of oxygen in the feed at 450{degrees}C. When the oxygen concentration in the feed varies, the NO conversion goes through a maximum for 2% at 450{degrees}C. The incorporation of Pt also promotes Co reducibility 1% is reduced to Co{degrees} in the monometallic sample and 13% in the bimetallic sample. XPS results reveal that in the calcined samples Co{sup 2+} is at exchange position and, after being reduced, there appear thinly dispersed Co{degrees} particles and exchanged Co{sup 2+} ions. A greater reducibility and a shift of the maxima in the temperature-programmed reduction profile suggest a Pt-Co interaction. In order to get an efficient catalyst for nitric oxide abatement it is necessary that the highly dispersed Co{degrees} and Pt{degrees} particles and the Co{sup 2+} and H{sup +} ions at exchange positions be in intimate contact inside the Mordenite channels.

• OSTI ID: 468004
• Report Number(s): CONF-960652--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
AIR POLLUTION CONTROL
CATALYTIC EFFECTS
COPPER
EXHAUST GASES
GASOLINE
METHANE
MORDENITE
NITRIC OXIDE
PLATINUM
SELECTIVE CATALYTIC REDUCTION
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
ZEOLITES