Model CO/sub 2/ gasification reactions on uncatalyzed and potassium catalyzed glassy carbon surfaces

Journal Article · Sat Nov 01 04:00:00 EST 1986 · J. Catal.; (United States)

OSTI ID:5540634

Kelemen, S R; Freund, H

The individual steps in the uncatalyzed and potassium catalyzed CO/sub 2/ gasification reaction were studied on glassy carbon surfaces using Temperature-programmed reaction spectroscopy (TPRS) with labeled isotopes, Auger electron spectroscopy (AES), and steady-state reaction kinetics. Uncatalyzed CO/sub 2/ gasification surfaces showed the presence of strongly bound oxygen. Subsequent CO/sub 2/ adsorption and dissociation activity were severely limited on uncatalyzed surfaces. In contrast, potassium catalyzed glassy carbon surfaces were active for CO/sub 2/ adsorption and dissociation. The energy barrier for dissociation of CO/sub 2/ to yield adsorbed oxygen and gaseous CO was estimated at 28 kcal/mole on the potassium catalyzed glassy carbon surface. Their results show that while the energetics of the CO formation step to produce CO from lattice carbon control the energetics of gasification by CO/sub 2/, the dissociative adsorption step is responsible for the increase in the reaction site density and increased gasification rate.

• Research Organization: Exxon Research and Engineering Labs., Annandale, NJ
• OSTI ID: 5540634
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 102:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ACTIVATION ENERGY
ADSORPTION
ALKALI METALS
AUGER ELECTRON SPECTROSCOPY
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COAL GASIFICATION
DISSOCIATION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
GASIFICATION
KINETICS
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM
REACTION KINETICS
SORPTION
SPECTROSCOPY
THERMOCHEMICAL PROCESSES