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Related Experiment Videos

Soluble polycyclic aromatic hydrocarbons in raw coals.

Z B Zhao1, K Liu, W Xie

  • 1Combustion Laboratory, Materials Characterization Center, Department of Chemistry, Western Kentucky University, Bowling Green, KY 42101, USA.

Journal of Hazardous Materials
|February 25, 2000
PubMed
Summary
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Polycyclic aromatic hydrocarbon (PAH) emissions from a coal-fired pilot FBC system.

Journal of hazardous materials·2001

This study investigated polycyclic aromatic hydrocarbons (PAHs) in coal, finding that higher carbon content in bituminous coals correlates with increased free PAH release. Understanding this relationship is crucial for managing PAHs during coal utilization.

Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Analytical Chemistry

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are hazardous compounds, with some identified as carcinogens.
  • PAHs released during coal utilization originate from complex reactions or as free PAHs from raw coal.
  • The contribution of free PAHs from raw coal to environmental release has been underestimated.

Purpose of the Study:

  • To investigate the relationship between PAH content in various coals and their elemental composition.
  • To quantify free PAHs released from different bituminous coal types.

Main Methods:

  • Eight bituminous coal samples with varying carbon content (65-90%) were analyzed.
  • Soxhlet extraction using dichloromethane was performed on coal samples.

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  • Gas chromatography/mass spectrometry (GC-MS) was employed for quantitative analysis of PAHs.

    • Main Results:

    • Over 20 types of PAHs were identified in the analyzed coal samples.
    • Total PAH content ranged from 1.2 to 28.3 mg/kg across different coal types.
    • Maximum total PAH extraction occurred in coals with a carbon content exceeding 84% by weight.

    Conclusions:

    • Coal's elemental composition, specifically carbon content, is a significant factor in the release of free PAHs.
    • Bituminous coals with higher carbon content are a more substantial source of free PAHs during utilization.
    • Further research should consider free PAHs from raw coal as a key emission source.