Main content area

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.