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dc.contributor.authorWang, Y.
dc.contributor.authorZhou, J.
dc.contributor.authorBai, L.
dc.contributor.authorChen, Y.
dc.contributor.authorZhang, Shu
dc.contributor.authorLin, X.
dc.date.accessioned2017-08-24T02:19:51Z
dc.date.available2017-08-24T02:19:51Z
dc.date.created2017-08-23T07:21:49Z
dc.date.issued2014
dc.identifier.citationWang, Y. and Zhou, J. and Bai, L. and Chen, Y. and Zhang, S. and Lin, X. 2014. Impacts of inherent o-containing functional groups on the surface properties of shengli lignite. Energy and Fuels. 28 (2): pp. 862-867.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/55656
dc.identifier.doi10.1021/ef402004j
dc.description.abstract

Shengli (SL) lignite was thermally treated by heating at 200-350 C in an effort to reduce the number of O-containing functional groups and water present. The presence of carboxyl groups, phenolic hydroxyl groups, and methoxy groups was characterized using a chemical titration method. The moisture holding capacity (MHC), wettability, and ? potential of the SL lignite were measured before and after the low-temperature heat treatment. The results revealed that the main reactions that occurred below 350 C were decarboxylation and dehydration, corresponding to the decomposition of more than 60% of the carboxyl groups and phenolic hydroxyl groups. SL lignite treated at 350 C displayed an approximately 50% reduction in its MHC. The O-containing functional groups (the carboxyl groups, in particular) played an important role in water adsorption, indicating that the formation of the hydrogen bond between the O-containing functional groups and water contributed most significantly to the water adsorption process. The contact angle decreased as the number of hydrophilic sites decreased as a result of the decomposition of O-containing functional groups. The ? potential of the SL lignite decreased significantly as the concentration of O-containing functional groups decreased. MHC was successfully correlated with the presence of O-containing functional groups and the quantity of surface area without oxygen groups, as follows: MHC = 2.655[-COOH] + 2.912[-OH] + 0.209[-OCH 3 ] - 3.321S non-O + 1.341, where S non-O for the lignite is defined as S non-O = S i (1 - C i /C 0 ), where S i is the surface area of the lignite and C i and C 0 are the total contents of O-containing functional groups in the heat-treatment or as-received lignites. © 2014 American Chemical Society.

dc.publisherAmerican Chemical Society
dc.titleImpacts of inherent o-containing functional groups on the surface properties of shengli lignite
dc.typeJournal Article
dcterms.source.volume28
dcterms.source.number2
dcterms.source.startPage862
dcterms.source.endPage867
dcterms.source.issn0887-0624
dcterms.source.titleEnergy and Fuels
curtin.departmentFuels and Energy Technology Institute
curtin.accessStatusFulltext not available


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