Oxidation of hydrogen over supported palladium

Oxidation of hydrogen (0.1–2.0% v/v) in air over supported palladium catalysts at 300–625 K and atmospheric pressure has been investigated using a microcalorimetric method. The kinetics are influenced by reactor design, with activated processes at low temperatures and diffusion-limited rates at high...

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Bibliographic Details
Published in:Journal of catalysis 1990-04, Vol.122 (2), p.219-229
Main Authors: Jones, M.G., Nevell, T.G.
Format: Article
Language:English
Subjects:
08 HYDROGEN
080800 - Hydrogen- Properties & Composition
ADSORPTION
AIR
ATMOSPHERIC PRESSURE
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
Chemistry
DEACTIVATION
DIFFUSION
ELEMENTS
Exact sciences and technology
FLUIDS
GASES
General and physical chemistry
HIGH TEMPERATURE
HYDROGEN
HYDROGEN COMPOUNDS
INHIBITION
KINETICS
MEDIUM TEMPERATURE
METALS
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PALLADIUM COMPOUNDS
PALLADIUM OXIDES
PLATINUM METALS
REACTION KINETICS
SORPTION
SURFACE PROPERTIES
SYNTHESIS
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WATER
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Description
Summary:Oxidation of hydrogen (0.1–2.0% v/v) in air over supported palladium catalysts at 300–625 K and atmospheric pressure has been investigated using a microcalorimetric method. The kinetics are influenced by reactor design, with activated processes at low temperatures and diffusion-limited rates at high temperatures. The mechanism involves a surface layer of PdO and weakly adsorbed H 2. Water causes inhibition and reversible deactivation, particularly at low temperatures. The reaction is strongly inhibited by bromomethane (0.1–1.0% v/v) which competes with hydrogen for adsorption sites.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(90)90276-P