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Title: Electron microscopy investigation of carbonaceous particulate matter generated by combustion of fossil fuels

Abstract

The morphology, microstructure, and composition of individual carbonaceous particles generated during combustion of coal, residual oil, and diesel fuel were investigated by various electron microscopy (EM) techniques, including scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED)/dark-field imaging, electron energy loss spectroscopy (EELS), scanning transmission electron microscopy (STEM), and energy-dispersive X-ray spectroscopy (EDS). Carbonaceous components of all of these fossil-fuel-derived particulate matter (PM) samples contain ultrafine soot aggregates with fractal chain morphologies and spherical primary particles (sizes {approximately}30-50 nm) that exhibit a concentric arrangement of stacked graphitic layers around the particle center. Some submicrometer soot aggregates with larger primary particles ({approximately}100-400 nm) were also found in coal-derived carbonaceous PM. Larger spherical or irregular-shaped porous char particles dominate the micrometer-sized fraction of coal and residual oil PM samples. The relative fractions of sp{sup 2} hybridized carbon atoms in carbonaceous particles were estimated from EELS measurements of the carbon K-edge taken at the magic angle. Although the carbonaceous particles generated by combustion of various fossil fuels may have quite different morphologies and microtextures, they possess similar internal structural parameters, such as the dimensions of basic structural units (BSUs) and the average hybridization state of the carbon atoms.more » Compositional differences between soot aggregates and char particles were observed, and such information could be used as fingerprints to identify the source of different types of carbonaceous particles. 36 refs., 11 figs.« less

Authors:
; ; ; ;  [1]
  1. University of Kentucky, Lexington, KY (US). Consortium for Fossil Fuel Science, Department of Chemical and Materials Engineering
Publication Date:
OSTI Identifier:
20638648
Resource Type:
Journal Article
Journal Name:
Energy and Fuels
Additional Journal Information:
Journal Volume: 19; Journal Issue: 4; Other Information: naresh@uky.edu; Journal ID: ISSN 0887-0624
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 02 PETROLEUM; CARBONACEOUS MATERIALS; FOSSIL FUELS; COMBUSTION PRODUCTS; MORPHOLOGY; MICROSTRUCTURE; CHEMICAL COMPOSITION; COAL; RESIDUAL FUELS; DIESEL FUELS; SCANNING ELECTRON MICROSCOPY; TRANSMISSION ELECTRON MICROSCOPY; ELECTRON DIFFRACTION; X-RAY SPECTROSCOPY; SOOT

Citation Formats

Chen, Yuanzhi, Shah, Naresh, Braun, Artur, Huggins, Frank E, and Huffman, Gerald P. Electron microscopy investigation of carbonaceous particulate matter generated by combustion of fossil fuels. United States: N. p., 2005. Web. doi:10.1021/ef049736y.
Chen, Yuanzhi, Shah, Naresh, Braun, Artur, Huggins, Frank E, & Huffman, Gerald P. Electron microscopy investigation of carbonaceous particulate matter generated by combustion of fossil fuels. United States. https://doi.org/10.1021/ef049736y
Chen, Yuanzhi, Shah, Naresh, Braun, Artur, Huggins, Frank E, and Huffman, Gerald P. Mon . "Electron microscopy investigation of carbonaceous particulate matter generated by combustion of fossil fuels". United States. https://doi.org/10.1021/ef049736y.
@article{osti_20638648,
title = {Electron microscopy investigation of carbonaceous particulate matter generated by combustion of fossil fuels},
author = {Chen, Yuanzhi and Shah, Naresh and Braun, Artur and Huggins, Frank E and Huffman, Gerald P},
abstractNote = {The morphology, microstructure, and composition of individual carbonaceous particles generated during combustion of coal, residual oil, and diesel fuel were investigated by various electron microscopy (EM) techniques, including scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED)/dark-field imaging, electron energy loss spectroscopy (EELS), scanning transmission electron microscopy (STEM), and energy-dispersive X-ray spectroscopy (EDS). Carbonaceous components of all of these fossil-fuel-derived particulate matter (PM) samples contain ultrafine soot aggregates with fractal chain morphologies and spherical primary particles (sizes {approximately}30-50 nm) that exhibit a concentric arrangement of stacked graphitic layers around the particle center. Some submicrometer soot aggregates with larger primary particles ({approximately}100-400 nm) were also found in coal-derived carbonaceous PM. Larger spherical or irregular-shaped porous char particles dominate the micrometer-sized fraction of coal and residual oil PM samples. The relative fractions of sp{sup 2} hybridized carbon atoms in carbonaceous particles were estimated from EELS measurements of the carbon K-edge taken at the magic angle. Although the carbonaceous particles generated by combustion of various fossil fuels may have quite different morphologies and microtextures, they possess similar internal structural parameters, such as the dimensions of basic structural units (BSUs) and the average hybridization state of the carbon atoms. Compositional differences between soot aggregates and char particles were observed, and such information could be used as fingerprints to identify the source of different types of carbonaceous particles. 36 refs., 11 figs.},
doi = {10.1021/ef049736y},
url = {https://www.osti.gov/biblio/20638648}, journal = {Energy and Fuels},
issn = {0887-0624},
number = 4,
volume = 19,
place = {United States},
year = {2005},
month = {8}
}