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TPD study on H sub 2 O-gasified and O sub 2 -chemisorbed coal chars

Conference · · Energy and Fuels; (USA)
OSTI ID:5345814
; ; ;  [1]
  1. Tohoku Univ., Sendia (Japan)
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Temperature-programmed desorption (TPD) profiles of H{sub 2}O-gasified and O{sub 2}-chemisorbed coal chars were investigated with five coals of different ranks. Coals were devolatilized in N{sub 2} and then gasified in H{sub 2}O at 1100 K. Initially, TPD of the partially gasified char was determined to 1100 K in vacuo. Later the TPD experiment was repeated after the O{sub 2}-chemisorption at 420 K on the above heat-treated sample. The sharp peaks in TPD patterns, corresponding to H{sub 2}O, CO{sub 2}, and CO evolution, all resulted from the presence of mineral matter, since no sharp peak was observed in the TPD patterns of the demineralized coal chars. The gas evolution pattern from the demineralized char was almost independent of coal type, and all of the demineralized coal chars exhibited almost the same gasification reactivities. The relationship between the gasification reactivity and the total amount of CO{sub 2} and CO evolution during TPD of gasified chars and O{sub 2}-chemisorbed chars is discussed.

OSTI ID:
5345814
Report Number(s):
CONF-8704303--
Journal Information:
Energy and Fuels; (USA), Journal Name: Energy and Fuels; (USA) Vol. 2:2; ISSN ENFUE; ISSN 0887-0624
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
CHEMISORPTION
COAL
COAL GASIFICATION
DATA
DESORPTION
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
GASIFICATION
HYDROGEN COMPOUNDS
INFORMATION
MATERIALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PYROLYSIS PRODUCTS
SEPARATION PROCESSES
SORPTION
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
WATER