Nature of carbon-oxygen complexes produced by different oxidants: Towards a unified theory of gasification

Conference · Sun Jan 01 04:00:00 EST 1989 · Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States)

OSTI ID:5969653

Hall, P J; Calo, J M; Teng, H; Suuberg, E M; May, J A; Lilly, W D

Studies suggest a strong similarity between the chemical nature of such complexes, thereby potentially providing a unifying basis for the gasification of carbon by oxidizing species. In one such study, Marchon et al chemisorbed O/sub 2/, CO/sub 2/ and H/sub 2/O onto polycrystalline graphite at different temperatures, performed linear temperature programmed desorption (TPD) at a heating rate of 50 K/min, and compared the resulting desorption spectra. The principal TPD features were large CO desorption peaks at 973, 1093 and 1253K. They tentatively assigned these features to semi-quinone functional groups. It was concluded that the activation energy for adsorption was determined by the local surface environment of the group, the surface coverage, and the nature of the adsorbing molecule itself. The present paper has two principal objectives: to further test the theory of the universal nature of oxygen complexes by comparing the TPD spectra of a char oxidized in O/sub 2/, CO/sub 2/, NO, HNO/sub 3/ and H/sub 2/O/sub 2/; and the reactivity question, which is approached by analyzing TPD data, and reactivity and surface area measurements for a gasified char.

• Research Organization: Brown Univ., Providence, RI (USA)
• DOE Contract Number: AC21-87MC23284; FG22-87PC79929
• OSTI ID: 5969653
• Report Number(s): CONF-8904169-
• Conference Information: Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Journal Volume: 34:1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ACTIVATION ENERGY
ADSORPTION
BITUMINOUS COAL
BLACK COAL
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
COMPLEXES
CONTROL
DESORPTION
ELEMENTS
ENERGY
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INORGANIC ACIDS
KINETICS
MATERIALS
NITRIC ACID
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDATION
OXIDES
OXIDIZERS
OXYGEN
OXYGEN COMPLEXES
OXYGEN COMPOUNDS
PEROXIDES
PYROLYSIS PRODUCTS
REACTION KINETICS
SORPTION
SURFACE AREA
SURFACE PROPERTIES
TEMPERATURE CONTROL
THERMOCHEMICAL PROCESSES