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• W2030607405 abstract "Abstract Fly-chars, partially burned (70–90% conversion) coal particles, from four different coals (anthracite to hvb-B), produced in a fluidized bed combustor at temperatures between 900 and 1300 K, have been characterized by Temperature Programmed Oxidation (TPO), C,H-analysis, mercury porosimetry, CO2-adsorption and scanning electron microscopy. TPO reveals a decrease in overall reactivity of the flychar with increasing combustion temperature, in the sense of a change from a reactive to an unreactive carbon. The specific surface area of flychar from the bituminous coals burned at 900–1000 K increases by a factor 2 to 5 because the reaction takes place throughout the entire particle. Above 1200 K combustion occurs only at the outer shell of the particle and hence the specific surface area remains rather constant. As a function of combustion temperature a clear shift from micro- to macroporosity development is observed. The molar H/C-ratio of the chars linearly decreases from 0.35 to 0.15 with increasing combustion temperature from 900 to 1300 K; the effect of coal rank is negligible." @default.
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• W2030607405 date "1990-01-01" @default.
• W2030607405 modified "2023-09-27" @default.
• W2030607405 title "The characterization of ‘fly-chars’ from coal combustion; the effect of temperature and rank on reactivity, texture and composition" @default.
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• W2030607405 doi "https://doi.org/10.1016/0378-3820(90)90078-7" @default.
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