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Density Functional Theory Investigation of Possible Structures of Radicals in Coal Undergoing O-2 Chemisorption at Ambient Temperature
Zhang, Zhiqiang1; Kang, Qiannan1; Yun, Tao1; Yan, Kefeng2,3
2017
Source PublicationENERGY & FUELS
ISSN0887-0624
Volume31Issue:1Pages:953-958
AbstractWe have performed a theoretical study, using density functional theory at the B3LYP/6-311G(d, p) level, of the possible radical types and their structures in coal and their stabilities once they come into contact with atmospheric O-2 at ambient temperature. Eight possible radical types were proposed and explored through fully optimized electronic structure calculations. It was found that the radicals arising from dangling bonds on both the aromatic ring and the alkyl chain via covalent bond rupture are highly reactive toward oxidation, which resulted in the formation of stable oxygen-containing radicals. However, singlet occupied molecular orbital analysis suggested that the obtained radical via O-2 addition on the alkyl group should be attributed to the carbon-centered radical. The aryloxy C-O bond scission actually forms a carbon-centered radical. This type of radical and the radical that originated from odd-numbered carbon fused aromatic rings show high stabilities toward oxidation on account of the positive adsorption free energy change. In addition, the oxidation susceptibility of the radicals derived, from five and seven-membered rings, and nitrogen heteroatom defects in polyaromatic units of coal are also low at 298 K. Unlike the above radicals that could yield a superoxide group through O-2 addition, hydrogen abstraction from a semiquinone radical should be the preferred pathway, which forms a stable quinone group: Meanwhile, small mobile OOH is formed, which may initiate, the chain radical oxidation reaction in low rank coal.
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1021/acs.energyfuels.6b03072
WOS Subject ExtendedEnergy & Fuels ; Engineering
WOS KeywordSTABLE CARBON RADICALS ; PYROLYSIS ; OXIDATION ; RANK
Indexed BySCI
Language英语
Funding OrganizationNational Science Foundation of China(51404162) ; Science and Technology Innovation Program of Higher Education Institutions Shanxi Province
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000392553800098
PublisherAMER CHEMICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/14027
Collection中国科学院广州能源研究所
Corresponding AuthorZhang, Zhiqiang
Affiliation1.Taiyuan Univ Technol, Coll Min Engn, Taiyuan 030024, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy & Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China
3.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Zhiqiang,Kang, Qiannan,Yun, Tao,et al. Density Functional Theory Investigation of Possible Structures of Radicals in Coal Undergoing O-2 Chemisorption at Ambient Temperature[J]. ENERGY & FUELS,2017,31(1):953-958.
APA Zhang, Zhiqiang,Kang, Qiannan,Yun, Tao,&Yan, Kefeng.(2017).Density Functional Theory Investigation of Possible Structures of Radicals in Coal Undergoing O-2 Chemisorption at Ambient Temperature.ENERGY & FUELS,31(1),953-958.
MLA Zhang, Zhiqiang,et al."Density Functional Theory Investigation of Possible Structures of Radicals in Coal Undergoing O-2 Chemisorption at Ambient Temperature".ENERGY & FUELS 31.1(2017):953-958.
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