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Significant parameters in the catalyzed CO/sub 2/ gasification of coal chars. [Boudouard reaction]

Technical Report ·
OSTI ID:5490468
; ; ; ;
Alkali and alkaline earth carbonates have been used to catalyze the CO/sub 2/ gasification of coal chars prepared by pyrolysis of Illinois No. 6 coal. We have found that alkaline earth carbonates are fair gasification catalysts, through throughputs are insensitive to loadings in the range of 5 to 20% by weight. The order of efficacy is Ba > Sr > Ca. Alkali carbonates are excellent catalysts, with throughputs showing a dependence on loadings and atomic number. In particular, at high loadings (20% wt) the order is Cs > K > Na > Li. As kinetic parameters for the alkali carbonate Boudouard reaction with coal chars differ significantly from that of graphites, an alternative redox cycle mechanism has been proposed involving an alkali hydride intermediate.
Research Organization:
General Electric Co., Schenectady, NY (USA). Research and Development Center
DOE Contract Number:
AC21-80MC14591
OSTI ID:
5490468
Report Number(s):
DOE/MC/14591-T1; ON: DE82008508
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ACTIVATION ENERGY
ALKALI METAL COMPOUNDS
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ARRHENIUS EQUATION
BARIUM
CALCIUM
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONATES
CATALYSTS
CATALYTIC EFFECTS
CESIUM
CHALCOGENIDES
CHARS
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
COAL GASIFICATION
DATA
ELEMENTS
ENERGY
EQUATIONS
EXPERIMENTAL DATA
GASIFICATION
GRAVIMETRIC ANALYSIS
INFORMATION
KINETICS
LITHIUM
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
POTASSIUM
PYROLYSIS PRODUCTS
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
SODIUM
STRONTIUM
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES