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| subject categories | publications | percentage (%) |
|---|---|---|
| Energy & Fuels | 2037 | 63.22 |
| Engineering Chemical | 1048 | 32.52 |
| Green Sustainable Science Technology | 492 | 15.27 |
| Environmental Science | 441 | 13.69 |
| Engineering Environmental | 383 | 11.89 |
| Thermodynamics | 362 | 11.23 |
| Materials Science | 279 | 8.66 |
| Chemistry Physical | 238 | 7.39 |
| Agricultural Engineering | 187 | 5.80 |
| Electrochemistry | 169 | 5.24 |
