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Kinetics of NO reduction by NH/sub 3/ over supported Pt and the effect of SO/sub 2/

Book ·
OSTI ID:7226400
Studies of the kinetics of the catalytic reduction of nitric oxide by ammonia over supported platinum were performed in a steady-state flow microreactor. The rate of reaction was satisfactorily described by a single-site Langmuir-Hinshelwood kinetic model involving associative NO adsorption and dissociative NH/sub 3/ adsorption. The reaction between adsorbed NO and an adsorbed nitrogen fragment appeared to be rate limiting. Oxygen markedly enhanced the reaction rate. The rate of NO reduction by NH/sub 3/ was markedly reduced by very low concentrations of sulfur dioxide, with catalyst activity being much more decreased for ruthenium as opposed to platinum, palladium, or nickel catalysts. Oxygen also enhanced the rate of NO reduction in the presence of SO/sub 2/. Hydrogen sulfide and SO/sub 2/ appeared to form different compounds upon reacting with Pt, Pd, and Ni; the susceptibility of attack was greatest with Ni and least with Pt.
OSTI ID:
7226400
Country of Publication:
United States
Language:
English

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Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330701 -- Emission Control-- Nitrogen Oxides
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
AMMONIA
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HYDRIDES
HYDROGEN COMPOUNDS
KINETICS
METALS
NICKEL
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
POLLUTION
REACTION KINETICS
REDUCTION
REFRACTORY METALS
RUTHENIUM
SEPARATION PROCESSES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SYNERGISM
TRANSITION ELEMENTS