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Title: Formation of nanocarbon spheres by thermal treatment of woody char from fast pyrolysis process
Author: Yan, Qiangu; Toghiani, Hossein; Cai, Zhiyong; Zhang, Jilei;
Source: Wood and Fiber Science, 46(4). pp. 437-450
Publication Series: Scientific Journal (JRNL)
Description: Influences of thermal treatment conditions of temperature, reaction cycle and time, and purge gas type on nanocarbon formation over bio-chars from fast pyrolysis and effects of thermal reaction cycle and purge gas type on bio-char surface functional groups were investigated by temperature-programmed desorption (TPD) and temperature programmed reduction methods. Nanospheres occurred on bio-chars under the activation temperature of 700ºC; more nanospheres occurred when temperature increased to 900ºC. Further increase of temperature to 1100ºC yielded bio-char surfaces covered with a layer of nanospheres between 20 and 50 nm. More carbon nanospheres formed by increasing thermal cycles and reaction time. Scanning electron microscope images of char surfaces showed there were fewer or no nanoparticles produced using H2 as the purge gas and they were porous. TPD results indicated that H2, H2O, CH4, CO, and CO2 in gas phases evolved from chars heated to 1000ºC during the first heating cycle. H2 and CH4 peaked at 750 and 651ºC, respectively. Both H2O and CO had two peaks and CO2 had a broad peak. Only trace amounts of H2 and CO were detected in the second cycle. There was no detection for CH4, H2O, and CO2 after the second cycle.
Keywords: Pine char, thermal, nanocarbon structures
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Yan, Qiangu; Toghiani, Hossein; Cai, Zhiyong; Zhang, Jilei. 2014. Formation of nanocarbon spheres by thermal treatment of woody char from fast pyrolysis process. Wood and Fiber Science. 46(4): 437-450.
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