Abstract
Zonguldak bituminous coal was demineralized with HCl and HF. Mineral removal was followed by classical chemical analysis and FT-i.r. spectroscopy to determine the types of inorganics dissolved. Scanning tunnelling microscopy (STM) images of the surfaces of original and acid-treated Zonguldak coal were compared with those of an original semianthracite and a highly oriented pyrolytic graphite. The scanning tunnelling microscope was operated in variable-current mode with an average tunnelling current of 20 pA and a bias voltage in the range 250-500 mV. It was concluded that STM has great potential for the investigation of the structural changes occurring on coal surfaces due to different treatments.
| Original language | English |
|---|---|
| Pages (from-to) | 855-857 |
| Number of pages | 3 |
| Journal | Fuel |
| Volume | 75 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - May 1996 |
Keywords
- Coal demineralization
- Scanning tunnelling microscopy
- Surface structure
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