Insights into the functional group transformation of a chinese brown coal during slow pyrolysis by combining various experiments

Lin, Xiongchao; Wang, Caihong; Ideta, Keiko; Miyawaki, Jin; Nishiyama, Yusuke; Yong-gang, Wang; Yoon, Seong‐Ho; Mochida, Isao

doi:10.1016/j.fuel.2013.10.081

Cited by 175 publications

(57 citation statements)

References 53 publications

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“…In particular, the alkyl carbon signal of HTD-320 was reduced by 80.1% whereas that of aromatic carbons increased by 22.18% compared with the corresponding values of raw coal. These trends may be attributed to desorption of volatile aliphatic hydrocarbons and polymerization of aromatic groups and/ or hydrocarbons [23]. Oxygen-containing group contents significantly decreased with increasing HTD temperature.…”

Section: Chemical Structural Changes During Htd Upgradementioning

confidence: 96%

Chemical and structural changes in XiMeng lignite and its carbon migration during hydrothermal dewatering

Liu

Zhang

et al. 2015

Fuel

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Section: Chemical Structural Changes During Htd Upgradementioning

confidence: 96%

Chemical and structural changes in XiMeng lignite and its carbon migration during hydrothermal dewatering

Liu

Zhang

et al. 2015

Fuel

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“…The contents of oxygen-containing functional groups in different dewatered coals and raw lignite have the same order, that is phenolic hydroxyl group > carbonyl group > carboxyl group > methoxyl group. Methoxyl and carboxyl groups are firstly decomposed at the temperature of 160 • C due to their weak bonds [24]. decrease afterwards.…”

Section: Changes Of Pore Structure In the Drying Process Of Lignitementioning

confidence: 99%

Study on the pore structure and oxygen-containing functional groups devoting to the hydrophilic force of dewatered lignite

Zhang

Jing

Kai-ge

et al. 2015

Applied Surface Science

153

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“…In the combustion process, the hydroxyl groups (-OH) and segments of coal matter (-CH 3 , -CH 2 -) play a substantial role (Cao et al 2015). Surface groups of coal have a small effect on the liquefaction, gasification, pyrolysis (Feng et al 2013;Lin et al 2014;Yu et al 2013) and wettability (Zhou et al 2015b) of coals. They play a particularly important role in the competitive adsorption of H 2 O, CH 4 and CO 2 molecules in coals (Gensterblum et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Identification of hard coal surface structure using polar and apolar small molecule substances

2016

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The paper presents a numerical approach to the analysis of the statistical effect of functional groups on the sorption of methanol and water on hard coal samples. The material used for the analysis was obtained from numerous samples of hard subbituminous and bituminous coals up to anthracite from different Polish coal mines and includes sorption isotherms of water and methanol vapors, as well as carbon dioxide and methane on these samples. Measurements were made of the sorption isotherms of water and methanol vapors and the data set has been supplemented with the sorption isotherms of water, methane and carbon dioxide taken from the literature for the precise estimation of the model parameters. More precise estimation is reached by using a strong setting of the coal structure parameters for a bigger number of sorption system, and in each case the same parameters of coal geometry are constant with an exact fitting of sorption isotherm. The adsorption-absorption model of the sorption in coal (Multiple Sorption Model-MSM) is used in the numerical experiments and the parameters of hard coal structure and the sorption systems are estimated. It has been stated that water as a polar substance together with methanol, as well as carbon dioxide and methane give good estimates of coal structure and let us quantify the polar effect of surface groups present in hard coal. The polar effect is introduced in the model in the range of adsorption and expansion subprocesses. The presence of oxygen groups in the bulk of coal matter has no significant effect and can be neglected. A weak decreasing tendency of polar factors ratio for water and methanol is discovered.

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Insights into the functional group transformation of a chinese brown coal during slow pyrolysis by combining various experiments

Cited by 175 publications

References 53 publications

Chemical and structural changes in XiMeng lignite and its carbon migration during hydrothermal dewatering

Chemical and structural changes in XiMeng lignite and its carbon migration during hydrothermal dewatering

Study on the pore structure and oxygen-containing functional groups devoting to the hydrophilic force of dewatered lignite

Identification of hard coal surface structure using polar and apolar small molecule substances

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