High-energy (neodymium) laser pyrolysis of U.S. coals

Vanderborgh, N.E.; Verzino, W.J.; Fletcher, Michael A.; Nichols, Beth A.

doi:10.1016/0165-2370(82)80024-7

Cited by 15 publications

(4 citation statements)

References 4 publications

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“…The authors of [14] detected the formation of ethylene, ethane and so on under the action of the radiation of CO 2 -laser pulses lasting for a second. In the case of the action of millisecond radiation of the neodymium laser, the formation of propylene, propine, benzene and so on was detected [16]. It may be concluded that the composition of gaseous products of coal pyrolysis under the action of nanosecond laser radiation is simpler than from coal pyrolysis under the action of millisecond or continuous laser radiation.…”

Section: Resultsmentioning

confidence: 95%

“…The composition of the gaseous products of laser pyrolysis of coal was reported in [14][15][16]. Under the action of the continuous radiation of CO 2 -laser, the formation of naphthalene, phenan-threne, pyrene and so on was detected [15].…”

Section: Resultsmentioning

confidence: 99%

“…Reactive radicals formed in this process interact with each other to form pyrolysis products. The highrate coal heating may be caused by laser radiation [10][11][12][13][14][15][16]. For example, it has been demonstrated in [10,12] that the laser pyrolysis of coal leads mainly to the formation of low-molecular gases: H 2 , CO and CH 4 .…”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis of High Volatile C Bituminous Coal under the Action of Nanosecond Laser Radiation

Kraft

Aduev

Nelyubina

et al. 2022

Eurasian Chem.-Technol. J.

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The effect of pulsed nanosecond laser radiation (wavelength 532 nm, pulse duration 14 ns, pulse repetition frequency 6 Hz, the density of laser radiation power 0.2–0.6 J/cm2) on the tableted samples of high volatile C bituminous coal in argon medium is investigated. Among the gaseous products of pyrolysis, H2, CH4, C2H2, CO and CO2 are detected. The volume fractions of gaseous products from sample pyrolysis depending on the laser radiation power density is established. Within the laser radiation power density range 0.2–0.4 J/cm2, the volume of the formed combustible gases per unit mass of the reacted sample increases, and remains almost unchanged with further increase in power density. The volume fraction of combustible gases in the mixture of gaseous pyrolysis products are only slightly dependent on the laser radiation power density. The action of nanosecond laser radiation with a power density of more than 0.4 J/cm2 causes intense ablation of the tableted sample containing 0.005 wt.%. polyvinyl alcohol. A tableted sample containing no binding material is destroyed under the action of nanosecond laser radiation with a power density of more than 0.2 J/cm2.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

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Pyrolysis of High Volatile C Bituminous Coal under the Action of Nanosecond Laser Radiation

Kraft

Aduev

Nelyubina

et al. 2022

Eurasian Chem.-Technol. J.

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“…Powders were preferred to small coal chunks as they gave more reproducible results. 23 More recently laser investigations of large organic poly-mers24'25 and coals, sometimes doped with polyaromatic hydrocarbons (PAHs),26-28 have been undertaken with on-(8) Vastola, F. J.; Pirone, A. J. Prepr. Pap.-Am.…”

Section: Introductionmentioning

confidence: 99%

Laser micropyrolysis gas chromatography/mass spectrometry of coal

Greenwood¹,

Zhang²,

Vastola³

et al. 1993

Anal. Chem.

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The focused output of a pulsed ruby laser is used for the in-situ pyrolysis of individual coal macerals. This study couples laser pyrolysis with gas chromatography/mass spectrometric analysis allowing for the detection of neutral, volatile organic compounds formed in coal pyrolysis. Typically, released pyrolyzates from the vitrinite of a subbituminous coal and a coalified log of lignite rank include a wide distribution of aliphatic compounds (predominantly alkanes) in addition to aromatic compounds such as alkylbenzenes, phenols, and naphthalenes. The production of such compounds highlights the efficiency of laser radiation as a source for coal pyrolysis. The distribution of the detected components in the pyrograms is typical of compounds produced from vitrinite-rich coals by other pyrolysis methods. Differing pyrolyzates populations, including subtle intensity fluctuations for common product classes, allows for chemical distinction between the two samples examined. The potential of this technique for the in-situ chemical investigation of individual coal macerals which may be present in very small amounts within the parent coal is established.

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