TY - JOUR
T1 - Impacts of temperature on evolution of char structure during pyrolysis of lignin
AU - Zhang, Chenting
AU - Shao, Yuewen
AU - Zhang, Lijun
AU - Zhang, Shu
AU - Westerhof, Roel J.M.
AU - Liu, Qing
AU - Jia, Peng
AU - Li, Qingyin
AU - Wang, Yi
AU - Hu, Xun
PY - 2020/1/10
Y1 - 2020/1/10
N2 - This study investigated the pyrolysis of lignin pyrolysis in a temperature region from 200 to 800 °C, aiming to understand influence of pyrolysis temperature on evolution of structures of the resulting char. The results showed that fusion of the ring structure initiated at 200 °C, where the C/H ratio in the char was equal to that in naphthalene (two fused rings). The C/H ratio in the char obtained at 350 °C corresponded to that in pyrene (four fused rings), while the char produced at 550 °C was equivalent to 20 fused benzene rings in terms of C/H ratio. The increasing pyrolysis temperature also shifted the oxygen-containing functionalities such as the carbonyl, esters, ketones in the bio-oil to the ether functionality that had a higher thermal stability. The DRIFTS study of pyrolysis of lignin showed that drastic changes of the functionalities and the internal structure of the char occurred in a narrow temperature region from 520 to 530 °C. The carbonyl functionality and the aliphatic structure were eliminated, and new conjugated π-bond systems formed.
AB - This study investigated the pyrolysis of lignin pyrolysis in a temperature region from 200 to 800 °C, aiming to understand influence of pyrolysis temperature on evolution of structures of the resulting char. The results showed that fusion of the ring structure initiated at 200 °C, where the C/H ratio in the char was equal to that in naphthalene (two fused rings). The C/H ratio in the char obtained at 350 °C corresponded to that in pyrene (four fused rings), while the char produced at 550 °C was equivalent to 20 fused benzene rings in terms of C/H ratio. The increasing pyrolysis temperature also shifted the oxygen-containing functionalities such as the carbonyl, esters, ketones in the bio-oil to the ether functionality that had a higher thermal stability. The DRIFTS study of pyrolysis of lignin showed that drastic changes of the functionalities and the internal structure of the char occurred in a narrow temperature region from 520 to 530 °C. The carbonyl functionality and the aliphatic structure were eliminated, and new conjugated π-bond systems formed.
KW - DRIFTS study of pyrolysis
KW - Impacts of temperature
KW - Pyrolysis of lignin
KW - Structure of char
KW - n/a OA procedure
UR - http://www.scopus.com/inward/record.url?scp=85074075610&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2019.134381
DO - 10.1016/j.scitotenv.2019.134381
M3 - Article
C2 - 31677466
AN - SCOPUS:85074075610
SN - 0048-9697
VL - 699
JO - Science of the total environment
JF - Science of the total environment
M1 - 134381
ER -
