Surface reaction rate of hydrogenation of adsorbed carbon monoxide as examined by an emissionless infrared diffuse reflectance spectrometer

Journal Article · Thu Sep 15 04:00:00 EDT 1983 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100242a017· OSTI ID:5647474

Niizuma, H ^[1]; Hattori, T; Mori, T; Miyamoto, A; Murakami, Y

---

1. Nagoya Univ., Japan

The behaviors of adsorbed CO species during the methanation of CO on supported metal catalysts were examined by using an EDR (emissionless infrared diffuse reflectance spectrometer). Major adsorbed species observed under steady-state CO-H/sub 2/ reaction were adsorbed CO and surface formate, and appreciable absorption could not be observed in C-H and O-H regions. The rate constants of disappearance of adsorbed species on 0.5% Pd/Al/sub 2/O/sub 3/ under the reaction conditions were also measured from the transient responses of IR spectra. The intensities of the bands due to surface formate did not change with time, showing that the surface formate is not an intermediate. The rate constants of disappearance of adsorbed CO (linear CO and bridge CO) were essentially identical with each other and were in good agreement with the rate constant of CH/sub 4/ formation measured by PSRA (pulse surface reaction rate analysis). These data indicate that the rate-determining step in the methanation of CO is the C-O bond dissociation of adsorbed species and the hydrogenation of the adsorbed carbon species proceeds rapidly. 8 figures, 1 table.

• OSTI ID: 5647474
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 87:19; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DISSOCIATION
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
INFRARED SPECTRA
KINETICS
METALS
METHANATION
METHANE
MINERALS
NICKEL
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
PRODUCTION
REACTION KINETICS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
SYNTHESIS GAS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
WATER