Reactions of oxygen containing structures in coal pyrolysis

Hodek, W.; Kirschstein, Jörg; Heek, Karl-Heinrich van

doi:10.1016/0016-2361(91)90133-u

Cited by 99 publications

(51 citation statements)

References 3 publications

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“…The highest concentration emission of CH4 occurred at about 380 °C. As previously noted (Hodek et al 1991;Arenillas et al 2003), the CH4 emission at relatively lower temperatures was most likely released from the C-C bond cleavage in aliphatic chains, whereas the CH4 emission at higher temperature zones was mainly produced from the cracking of a weakly bonded methoxyl-O-CH3 group as well as the break of having higher bond energy of methylene group -CH2- (Ferdous et al 2001). From the perspective of biomass components pyrolysis, the CH4 was mainly released from the pyrolysis of lignin because it contains more methoxyl-O-CH3 chemical groups than hemicelluloses and celluloses (Liu et al 2008).…”

Section: Influence Of Process Parameters On the Release Of Bio-syngasmentioning

confidence: 53%

Assessing the Effects of Different Process Parameters on the Pyrolysis Behaviors and Thermal Dynamics of Corncob Fractions

Yao¹,

Xu²,

Liang³

2017

BioResources

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The influence of heating rate, gas flow, and biomass particle size on the pyrolysis and thermal dynamics of corncobs (CC) was investigated experimentally using the quantitative method of thermogravimetric analysis (TGA) coupled with mass spectrometry (MS), and the obtained results were compared in depth. For the examined heating rates of 5, 10, and 20 °C/min, the CC pyrolysis at higher heating rates resulted in a more complete decomposition. The initial pyrolysis temperature decreased when gas flow was increased from 30 to 90 mL/min, whereas the weight loss increased. Particle sizes (d ≤ 74 μm, 74 μm < d ≤ 154 μm, 154 μm < d ≤ 280 μm, and 280 μm < d ≤ 450 μm) had pronounced effects on the thermal decomposition and bio-syngas compounds (CO, CO2, CH4, and H2) distribution. The emission intensities of most the gaseous products increased at the elevated heating rate, while they decreased with increasing gas flow. In sum, the pyrolysis of CC particles of 154 μm < d ≤ 280 μm under 20 °C/min and in a gas flow of 30 to 60 mL/min was the most appropriate for bio-syngas production in industrial applications.

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Section: Influence Of Process Parameters On the Release Of Bio-syngasmentioning

confidence: 53%

Assessing the Effects of Different Process Parameters on the Pyrolysis Behaviors and Thermal Dynamics of Corncob Fractions

Yao¹,

Xu²,

Liang³

2017

BioResources

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“…According to previous reports, the CO formation of coal pyrolysis was closely related with three to five potential reactions (Seebauer et al 1997; Hodek et al 1991;Giroux et al 2006). As shown in Fig.…”

Section: Mechanism Of Co Formationmentioning

confidence: 97%

Characteristics of gas evolution profiles during coal pyrolysis and its relation with the variation of functional groups

Zhang

Takeda

et al. 2017

Int J Coal Sci Technol

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Strict relation between the substituents or functional groups attached to the coal macromolecules and the generation of the volatile products, e.g., CH 4 , H 2 O, CO, CO 2 , etc., during the coal pyrolysis is an important but confusing subject. In this paper, quadrupole mass spectrometry, gas chromatography, and 13 C nuclear magnetic resonance are applied to real-time monitoring the formations of volatile products, off-line quantitative determination of the total products from the pyrolysis of a sub-bituminous coal (SC), and the changes of diverse substitents in the SC along with coke foamation, respectively. These measurements are also performed for the pyrolysis of a caking coal to contrast SC. The qualitative and quantitative data reveal that, during coal pyrolysis, the functional groups related with the formation of CO, i.e., ether, carbonyl, and anhydride, can directly generate CO via bond breaking, or take a detour of the formation of other intermediates via condensation and recombination firstly. Moreover, the formations of CO 2 and CH 4 are related to the direct removal of -COO-and -CH 3 , respectively.

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“…Vitrinite rich bands were selected as the reference maceral because vitrinite is considered to be more sensitive than other macerals to chemical or thermal reactions that may induce changes in sp 2 -sp 3 electron configurations observable by Raman spectroscopy. Moreover, there are several published data sets available for comparison that describe changes in vitrinite Raman spectra induced by pyrolysis or thermal coking (Das, 2001;Hodek et al, 1991;Li, 2007;Rentel, 1987;Scaroni et al, 1988).…”

Section: Raman Spectroscopymentioning

confidence: 97%

Creation of microchannels in Bowen Basin coals using UV laser and reactive ion etching

Mahoney

Rufford

Rudolph

et al. 2015

International Journal of Coal Geology

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Reactions of oxygen containing structures in coal pyrolysis

Cited by 99 publications

References 3 publications

Assessing the Effects of Different Process Parameters on the Pyrolysis Behaviors and Thermal Dynamics of Corncob Fractions

Assessing the Effects of Different Process Parameters on the Pyrolysis Behaviors and Thermal Dynamics of Corncob Fractions

Characteristics of gas evolution profiles during coal pyrolysis and its relation with the variation of functional groups

Creation of microchannels in Bowen Basin coals using UV laser and reactive ion etching

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