封面图片
2022年, 第16卷 第12期
The direct coal liquefaction follows radical reaction mechanism, and the product distributions are determined by varied reaction behavior of the radicals. Among them, the release of free radical is mainly related to the chemical bond composition of the organic structure in coal, and lignite contains a large amount oxygen, which generates oxygenated aromatic compounds in thermal conversion. However, in direct coal liquefaction, a “hydrogen-rich” environment is a distinctive feature, where the oxygen element in the coal is easily converted to water, resulting in the waste of hydrogen and oxygen elements. The direct coal liquefaction is initiated by the generation of free radicals in pyrolysis, which leads to the hydrogen abstract reaction by radicals. The hydrogen abstraction can be followed by the spontaneous shedding of an H atom from the hydrogen-donor solvent, thus completing the removal of two H atoms from the hydrogen-donor solvent. The spontaneous shedding of H radicals will be used to stabilize radicals as well as radical-induced pyrolysis, thus affecting the distribution of the product. The proposed two-step hydrogen supplying and H radical-induced mechanism complements the radical reaction mechanism of the direct coal liquefaction. (Wang Li, Wen-Ying Li , Xing-Bao Wang, Jie Feng, pp. 1689–1699)[展开] ...
ISSN 2095-0179 (Print)
ISSN 2095-0187 (Online)
CN 11-5981/TQ
Postal Subscription Code 80-969 Formerly Known as Frontiers of Chemical Science and Engineering in China 2018 Impact Factor: 2.809