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• W3154671317 startingPage "105128" @default.
• W3154671317 abstract "• Chemical characteristics of biochar were analyzed with FTIR-Solomon method. • Stability of C O in biochar is stronger than that of C O during pyrolysis. • A noticeable CH 4 steam reforming reaction occurs at 800 °C. • When the temperature is above 600 °C, the tar starts its aromatization. • Migration pathways of C/H/O in biomass during pyrolysis were analyzed. Pyrolysis is a fundamental part of the biomass thermal conversion and utilization. A one-stage fluidized bed reactor was used to study the characteristics of gas-liquid-solid products and the migration regulation of C/H/O elements during biomass pyrolysis. The specific conclusions are as follows: the char yield decreases from 24.3 %–14.9 % during pyrolysis from 500 °C to 800 °C. The tar yield decreases from 16.9 % to less than 5 %, while the gas yield increases from 24 % to 71.3 %. The graphitization of biochar decreases and its aromaticity increases during pyrolysis. The form of hydrogen existing in biochar is converted from aliphatic hydrogen to aromatic hydrogen during pyrolysis. The content of weaken-bound oxygen such as carboxyl and aldehyde decreases significantly while the content of strong-bound oxygen such as C O and C O C is essentially unchanged. The peak emission of CO during the instantaneous combustion of biochar increases from 0.0013 L/(g min to 0.0032 L/(g min at 500 °C to 800 °C. The tar starts its aromatization at 700 °C. The aliphatic component disappears from 33 % at 500 °C–600 °C. The double bond equivalent parameter of tar increases significantly, while its H/C ratio and O/C ratio both decrease. The yields of CO/CO 2 /CH 4 increase significantly from 500 °C to 700 °C. H 2 starts to appear at 700 °C. A noticeable CH 4 steam reforming reaction starts when raising to 800 °C, leading to a decrease in CH 4 yield and an increase in CO yield and H 2 yield. C/H/O elements in biochar and tar are gradually lost during pyrolysis. The gas phase becomes the main existing form of C/H/O elements after raising to 700 °C." @default.
• W3154671317 created "2021-04-26" @default.
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• W3154671317 date "2021-06-01" @default.
• W3154671317 modified "2023-10-18" @default.
• W3154671317 title "Thermal evolution of gas-liquid-solid products and migration regulation of C/H/O elements during biomass pyrolysis" @default.
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• W3154671317 doi "https://doi.org/10.1016/j.jaap.2021.105128" @default.
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