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	Effects of phenolic hydroxyl and carboxyl groups on the concentration of different forms of water in brown coal and their dewatering energy
	Han, Yan-Na1,4; Bai, Zong-Qing1; Liao, Jun-Jie2,3; Bai, Jin1; Dai, Xin1,4; Li, Xiao1,4; Xu, Jun-Li1,4; Li, Wen1
刊名	Fuel processing technology
	2016-12-15
卷号	154页码:7-18
关键词	Oxygen functional groups Forms of water Brown coal Dewatering energy
ISSN号	0378-3820
DOI	10.1016/j.fuproc.2016.08.006
通讯作者	Bai, zong-qing(baizq@sxicc.ac.cn) ; Liao, jun-jie(liaojjie@163.com)
英文摘要	Oxygen functional groups as primary adsorption site of water are one of key factors controlling water re-adsorption and drying behaviors of brown coal. the dewatering energy of brown coal because of different oxygen functional groups is still unclear. thus, two kinds of oxidized brown coal samples carrying more phenolic hydroxyl or carboxyl groups with similar pore structures were chosen. the concentrations of different water forms of the samples were determined from the moisture holding capacity at constant humidity and temperature and from the results of dewatering experiments analyzed by thermogravimetry coupled with differential scanning calorimetry. the results showed that the concentrations of three forms of water, i.e. free water, capillary water, and molecular water, showed good correlations with concentration of carboxyl groups. comparison of h-1 nmr analysis of dried and moisturized samples showed that the types of oxygen functional groups predominantly affected the water environment in coal. ir spectra of dried and adsorbed d2o samples showed that oh-pi hydrogen bond due to carboxyl groups was easier broken than that due to phenolic hydroxyl groups. the water desorption energy of primary site and dewatering energy of samples with more carboxyl groups were lower than that of samples with more phenolic hydroxyl groups, because hydrogen bonding energy of water bonded to hydroxyl oxygen of carboxyl groups was lower than that of water bonded to hydroxyl oxygen of phenolic hydroxyl groups. (c) 2016 elsevier b.v. all rights reserved.
WOS关键词	LOW-RANK COALS ; CHEMICAL-STRUCTURE CHANGES ; CHINESE LIGNITE ; PORE STRUCTURE ; COAL/WATER SYSTEM ; SUPERHEATED STEAM ; FUNCTIONAL-GROUPS ; HYDROGEN-BONDS ; HOT AIR ; SPECTROSCOPY
WOS研究方向	Chemistry ; Energy & Fuels ; Engineering
WOS类目	Chemistry, Applied ; Energy & Fuels ; Engineering, Chemical
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000385321400002
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2374886
专题	中国科学院大学
通讯作者	Bai, Zong-Qing; Liao, Jun-Jie
作者单位	1.Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China 2.Taiyuan Univ Technol, State Key Lab Breeding Base Coal Sci & Technol Co, Taiyuan 030024, Peoples R China 3.Taiyuan Univ Technol, Minist Sci & Technol, Taiyuan 030024, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Han, Yan-Na,Bai, Zong-Qing,Liao, Jun-Jie,et al. Effects of phenolic hydroxyl and carboxyl groups on the concentration of different forms of water in brown coal and their dewatering energy[J]. Fuel processing technology,2016,154:7-18.
APA	Han, Yan-Na.,Bai, Zong-Qing.,Liao, Jun-Jie.,Bai, Jin.,Dai, Xin.,...&Li, Wen.(2016).Effects of phenolic hydroxyl and carboxyl groups on the concentration of different forms of water in brown coal and their dewatering energy.Fuel processing technology,154,7-18.
MLA	Han, Yan-Na,et al."Effects of phenolic hydroxyl and carboxyl groups on the concentration of different forms of water in brown coal and their dewatering energy".Fuel processing technology 154(2016):7-18.

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