The CO/H sub 2 reaction on Rh/Al sub 2 O sub 3. II. Kinetic study by transient isotopic methods

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90256-X· OSTI ID:6844639

Efstathiou, A M; Bennett, C O ^[1]

---

1. Univ. of Connecticut, Storrs (USA)

Transient isotopic methods have been used to study the CO/H{sub 2} reaction over 5% Rh/Al{sub 2}O{sub 3} in the temperature range 180-260 C. The steady-state tracing method permits the determination of the surface coverage of CO and active carbon C{sub {alpha}} during reaction, without the need for quenching in helium and subsequent titration by hydrogen. The results confirm that the sequence of steps for methane formation passes through a small reservoir of active carbon ({theta}{sub C{sub {alpha}}} < 0.05), although there is also a large reservoir of surface CO. Rate control is largely determined by the rate of CO dissociation on the surface. The simultaneous presence of a formate species, located on the alumina and which does not participate in the reaction, has been supported by the results of isotopic experiments.

• OSTI ID: 6844639
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 120:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010408* -- Coal
Lignite
&amp; Peat-- C1 Processes-- (1987-)
ACTIVATED CARBON
ADSORBENTS
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON
CARBON 12
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CARBOXYLIC ACID SALTS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONTROL
DEPOSITION
DISSOCIATION
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FORMATES
HYDROCARBONS
HYDROGENATION
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LIGHT NUCLEI
METALS
METHANATION
METHANE
NONMETALS
NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
REACTION KINETICS
REDUCTION
RHODIUM
STABLE ISOTOPES
SYNTHESIS
TEMPERATURE CONTROL
TEMPERATURE DEPENDENCE
TRACER TECHNIQUES
TRANSIENTS
TRANSITION ELEMENTS