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Ammonia decomposition in the presence of water vapor. I. Nickel, ruthenium, and palladium catalysts. [Reduction of NO by H/sub 2/]

Journal Article · · J. Catal.; (United States)
OSTI ID:7209223
; ;
The activity of different catalysts used for the catalytic decomposition of ammonia in the presence of water vapor was studied so as to obtain selective catalysts for the reduction of NO by H/sub 2/ into N/sub 2/. Ni, Ru, and Pd base formulas and Ni--Ru and Ni--Pd associations from different preparation methods were investigated. The catalytic species appears to be reduced metal despite the presence of water vapor. Ru proves to be the most active metal, while Pd is inactive. If the initial catalyst is in an oxidized form, reduction by the reaction medium becomes necessary. With NiO this reduction is slow and requires a temperature of about 600/sup 0/C, but it appears to be extremely fast with oxidized Ru. With reduced Ru, an activation appears necessary around 530/sup 0/C. This activation has been interpreted as expressing a reconstruction of the metal surface. The addition of the noble metals Ru and Pd to nickel oxide enhances the reducibility of this oxide but does not appear to introduce any synergetic effect for the preparation method used.
Research Organization:
Inst. Francais du Petrole, Rueil-Malmaison, France
OSTI ID:
7209223
Journal Information:
J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 48:1-3; ISSN JCTLA
Country of Publication:
United States
Language:
English

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Related Subjects

090310* -- Inorganic Hydrogen Compound Fuels-- Properties-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALLOYS
AMMONIA
CATALYTIC EFFECTS
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
FLUIDS
GASES
HYDRIDES
HYDROGEN COMPOUNDS
METALS
NICKEL
NICKEL ALLOYS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
PALLADIUM
PALLADIUM ALLOYS
PLATINUM METAL ALLOYS
PLATINUM METALS
REFRACTORY METALS
RUTHENIUM
RUTHENIUM ALLOYS
TRANSITION ELEMENTS
VAPORS
WATER VAPOR