Mechanisms of NO reduction by NH{sub 3} over Pt/Al{sub 2}O{sub 3} and V{sub 2}O{sub 5}TiO{sub 2}

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

OSTI ID:141998

Bell, A T ^[1]

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1. Lawrence Berkeley Laboratory, CA (United States)

Selective reduction of NO in the presence of O{sub 2} is often utilized to control the emissions of NO from stationary sources such as power plants. Typical catalysts for such applications are Pt/Al{sub 2}O{sub 3} and V{sub 2}O{sub 5}/TiO{sub 2}. Empirical evidence has shown that NH{sub 3} is capable of reducing NO under the desired conditions, and that the presence of O{sub 2} accelerates the rate of NO reduction. This talk will compare and contrast the results of mechanistic studies aimed at understanding the elementary processes involved in the reduction of NO by NH{sub 3} on both Pt and V{sub 2}O{sub 5} catalysts. It will be shown that in both cases, oxygen on the catalyst surface aids in the activation of NH{sub 3} to form NH{sub x} (x-0-2) species and that N{sub 2} and N{sub 2}O are formed by direct reaction of NH{sub x} species with adsorbed NO.

• OSTI ID: 141998
• Report Number(s): CONF-930304--
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ALUMINIUM OXIDES
AMMONIA
CATALYTIC EFFECTS
CHEMICAL ACTIVATION
CHEMICAL REACTION KINETICS
NITRIC OXIDE
OXIDES
PLATINUM
REDUCTION
TITANIUM OXIDES
VANADIUM OXIDES