TY - JOUR
T1 - New quantitative approach for microstructural analysis of coal char using HRTEM images
AU - Sharma, A.
AU - Kyotani, T.
AU - Tomita, A.
N1 - Funding Information:
This study was partly supported by “Research for the Future Program-Molecular Engineering of Coal” which was sponsored by the Japan Society for the Promotion of Science. The helpful discussion with Prof M. Shiraishi of Tokai University is gratefully acknowledged. One of the authors, A.S., wishes to thank Harish Hirani of IIT, Delhi for his useful suggestions in the development of the image algorithm. We would like to express our appreciation to the High Voltage Electron Microscope Laboratory of the Tohoku University for the microscope observation.
PY - 1999/8
Y1 - 1999/8
N2 - HRTEM is a useful technique to observe the structure of coal char at an atomic level. To analyze the char structure quantitatively, we developed a new filtration technique for HRTEM images and a computer algorithm to obtain information such as the graphene layer size, interlayer spacing, the number of layers per stack, and its distribution from the post-filtered extracted HRTEM images. By using a computerized imaging system and image analysis algorithm, it is possible to analyze many images from different sample spots, which helps to make the analyzed result as general as possible. The aim of this article is to describe the usefulness of the technique to analyze the structure of carbonaceous materials. We applied this technique to study quantitatively the crystallinity of Pocahontas coal chars gasified in CO2 up to various conversion levels at 1200 °C. TEM observation showed a remarkable structural change during the gasification.
AB - HRTEM is a useful technique to observe the structure of coal char at an atomic level. To analyze the char structure quantitatively, we developed a new filtration technique for HRTEM images and a computer algorithm to obtain information such as the graphene layer size, interlayer spacing, the number of layers per stack, and its distribution from the post-filtered extracted HRTEM images. By using a computerized imaging system and image analysis algorithm, it is possible to analyze many images from different sample spots, which helps to make the analyzed result as general as possible. The aim of this article is to describe the usefulness of the technique to analyze the structure of carbonaceous materials. We applied this technique to study quantitatively the crystallinity of Pocahontas coal chars gasified in CO2 up to various conversion levels at 1200 °C. TEM observation showed a remarkable structural change during the gasification.
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U2 - 10.1016/S0016-2361(99)00046-0
DO - 10.1016/S0016-2361(99)00046-0
M3 - Article
AN - SCOPUS:0033169638
SN - 0016-2361
VL - 78
SP - 1203
EP - 1212
JO - Fuel
JF - Fuel
IS - 10
ER -