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Regeneration performance and carbon consumption of semi-coke and activated coke for SO2 and NO removal
- Ding, Song, Li, Yuran, Zhu, Tingyu, Guo, Yangyang
- Journal of Environmental Sciences 2015 v.34 pp. 37-43
- Fourier transform infrared spectroscopy, adsorbents, adsorption, carbon, desorption, flue gas, lactones, micropores, nitric oxide, operating costs, spectrometers, sulfur dioxide, temperature, titration
- To decrease the operating cost of flue gas purification technologies based on carbon-based materials, the adsorption and regeneration performance of low-price semi-coke and activated coke were compared for SO2 and NO removal in a simulated flue gas. The functional groups of the two adsorbents before and after regeneration were characterized by a Fourier transform infrared (FTIR) spectrometer, and were quantitatively assessed using temperature programmed desorption (TPD) coupled with FTIR and acid–base titration. The results show that semi-coke had higher adsorption capacity (16.2% for SO2 and 38.6% for NO) than activated coke because of its higher content of basic functional groups and lactones. After regeneration, the adsorption performance of semi-coke decreased because the number of active functional groups decreased and the micropores increased. Semi-coke had better regeneration performance than activated coke. Semi-coke had a larger SO2 recovery of 7.2% and smaller carbon consumption of 12% compared to activated coke. The semi-coke carbon-based adsorbent could be regenerated at lower temperatures to depress the carbon consumption, because the SO2 recovery was only reduced a small amount.