Characterization of Coals Using Laser Pyrolysis–gas Chromatography

Hanson, Ray L.; Vanderborgh, N.E.

doi:10.1016/b978-0-12-399903-0.50009-x

Cited by 4 publications

(6 citation statements)

References 32 publications

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“…These previously published spectra taken with homopolymers generally show truncation of the LAMMA record near a m/z of 150, apparently showing no compounds larger than Cn (6). This result parallels earlier laser pyrolysis studies (18) that suggest that higher molecular weight fragments are not produced with intense, short-lived photon pulses. Ionization probabilities as well as cationization "cross sections" remain essentially constant for hydrocarbons heavier than C7.…”

Section: Resultssupporting

confidence: 83%

“…Thus although polymer degradation yields predominantly neutral fragments, only charged fragments are recorded (7). We suspect generally similar product formation mechanism with coals and shales (18). Fragments that exhibit charge stabilization are readily discernible (metal cations).…”

Section: Resultsmentioning

confidence: 79%

“…Positive spectra are of the general formula [ X 12], [( X 12) + 1], and [( X 12) + 2], suggesting compounds such as C"+, C"H+, and C"H2+. Previous studies of polyethylene pyrolysis show that the monomer ethylene is one expected minor product (18). LAMMA degradation should also produce that compound and others known to result from thermal degradation of that system.…”

Section: Resultsmentioning

confidence: 96%

“…At first these data were interpreted as carbon oligomers, beginning with the carbon dimer and extending to a value of 16 carbon atoms (6). Such molecular fragments are hydrogen deficient (compounds such as CgH2+ are required to explain the peak at m/z 62) and have no known antecedents either in pyrolysis of these coals (18) or in technical polymers (6). The LAMMA instrument has sufficient range to display larger masses than the Cj.6 fragment; no such higher mass fragments are detectable under these conditions.…”

Section: Resultsmentioning

confidence: 99%

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Laser microprobe mass analysis studies on coal and shale samples

Vanderborgh¹,

Jones²

1983

Anal. Chem.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Laser microprobe mass analysis studies on coal and shale samples

Vanderborgh¹,

Jones²

1983

Anal. Chem.

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“…Products from the exposure of organic materials to high power laser induced plasmas (27)(28)(29)(30)(31)(32)(33) are very similar to those produced in the MIP. The major hydrocarbon species produced by laser irradiation of coal were H2, CH4, C2H4, and C2H6.…”

Section: Resultsmentioning

confidence: 97%

Elemental detection with a microwave-induced plasma/gas chromatograph-mass spectrometer system

Heppner¹

1983

Anal. Chem.

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Development of a technique that uses a low-pressure microwave-induced plasma (MIP) for selective elemental detection In a combined gas chromatograph/mass spectrometer (GC-MS) system is described. With this technique, complex organic molecules are converted Into a few simple neutral species by passage through the MIP unit. The elements present In the original molecules determine which species will be formed in the MIP. In a hydrogen-rich plasma, oxygen forms CO and H20, sulfur forms CS2, nitrogen forms HCN, chlorine forms HCI, and carbon forms, CH4, C2H2, C2H4, and C2He. Identification and quantification of these simple neutral species enable elemental composition information for the original molecules to be determined. Detection of elemental C, N, O, S, and Cl and measurement of elemental C/O and C/N ratios In a variety of compound types and structures by the MIP/GC-MS technique are discussed. With the relatively unsophisticated mode of operation used, the dynamic range for the technique Is 400, and the sensitivity limit for elemental carbon passing through the MIP Is 0.3 yug/s.

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