Catalytic oxidation of carbon monoxide on palladium. 1. Effect of pressure

Journal Article · Thu Feb 08 04:00:00 EST 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100366a037· OSTI ID:7245963

Landry, S M; Dalla Betta, R A; Lue, J P; Boudart, M ^[1]

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1. Stanford Univ., CA (USA)

The turnover rate for CO oxidation on palladium increases by a factor of 7.4, at 445 K and an equimolar ratio of reactants, when the total pressure increases from 10{sup {minus}6} to 10{sup 2} mbar. This effect of pressure is contrary to that expected from previous kinetic studies that predict no effect of pressure on rate, with one exception. Additionally, the apparent activation energy changes from ca. 110 kJ mol{sup {minus}1} at high pressure (10{sup 2} mbar) to ca. 75 kJ mol{sup {minus}1} at lower pressures (10{sup {minus}1} and 10{sup {minus}6} mbar), suggesting a change in reaction mechanism with pressure.

• OSTI ID: 7245963
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:3; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CALCULATION METHODS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA ANALYSIS
ELEMENTS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
PRESSURE EFFECTS
TRANSITION ELEMENTS