The comparison of a lignite char, subbituminous coal char, and a bituminous coal char used in the reaction with steam to produce hydrogen

Conference · Fri Jan 01 04:00:00 EST 1988 · Preprints of Papers, American Chemical Society, Division of Fuel Chemistry; (USA)

OSTI ID:5290149

Timpe, R C; Sears, R E ^[1]

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1. Univ. of North Dakota Energy and Minerals Research Center, Grand Forks (USA)

The use of coal as carbon source in the char-steam reaction to produce hydrogen gas over the temperature range 700-800 C (973-1,073 K) at atmospheric pressure has been studied in detail. Velva lignite has properties which give its char superior reactivity over those of the other coals tested. Catalysis with alkali carbonates enhanced the reactivity of Velva char substantially, whereas demineralization reduced the reactivity to a relatively constant value over the temperature range studied by removing inorganic material and altering the surface characteristics of the coal. Char produced from a Wyodak subbituminous coal and River King bituminous coal were much less reactive than Velva in the absence of catalyst but responded positively to the addition of alkali carbonates. Upon demineralization, these coals also showed reduced reactivity and altered surface features. This paper discusses the results of the experiments in terms of the reactivity data, SEM photos and elemental mapping, organic properties as determined from {sup 13}C NMR and ESCA spectroscopy, and inorganic content of the substrates.

• OSTI ID: 5290149
• Report Number(s): CONF-8806136--
• Conference Information: Journal Name: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry; (USA) Journal Volume: 33:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
08 HYDROGEN
080107 -- Hydrogen-- Production-- Coal Gasification
ACTIVATION ENERGY
ALKALI METAL COMPOUNDS
ASH CONTENT
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CALORIFIC VALUE
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CARBONATES
CATALYTIC EFFECTS
CHARS
CHEMICAL ANALYSIS
CHEMICAL PROPERTIES
CHROMATOGRAPHY
COAL
COAL GASIFICATION
COMBUSTION PROPERTIES
COMPARATIVE EVALUATIONS
DEVOLATILIZATION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ENERGY
ENERGY SOURCES
EVEN-ODD NUCLEI
FOSSIL FUELS
FUELS
GAS CHROMATOGRAPHY
GASIFICATION
GRAVIMETRIC ANALYSIS
HYDROGEN PRODUCTION
ISOTOPES
LIGHT NUCLEI
LIGNITE
MAGNETIC RESONANCE
MATERIALS
MICROSCOPY
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OXYGEN COMPOUNDS
POTASSIUM CARBONATES
POTASSIUM COMPOUNDS
PYROLYSIS PRODUCTS
QUANTITATIVE CHEMICAL ANALYSIS
RESONANCE
SCANNING ELECTRON MICROSCOPY
SEPARATION PROCESSES
SPECTROSCOPY
STABLE ISOTOPES
STEAM
SUBBITUMINOUS COAL
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES