Regeneration performance and carbon consumption of semi-coke and activated coke for SO₂ and NO removal

Song Ding; Yuran Li; Tingyu Zhu; Yangyang Guo

doi:10.1016/j.jes.2015.02.004

Regeneration performance and carbon consumption of semi-coke and activated coke for SO₂ and NO removal

J Environ Sci (China). 2015 Aug 1:34:37-43. doi: 10.1016/j.jes.2015.02.004. Epub 2015 May 19.

Authors

Song Ding¹, Yuran Li², Tingyu Zhu³, Yangyang Guo²

Affiliations

¹ School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China; National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: sding@ipe.ac.cn.
² National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
³ School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China; National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: tyzhu@ipe.ac.cn.

PMID: 26257344
DOI: 10.1016/j.jes.2015.02.004

Abstract

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.

Keywords: Adsorption; Carbon consumption; Functional groups; SO(2) recovery.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Air Pollutants / chemistry*
Carbon / chemistry*
Coke / analysis*
Environmental Restoration and Remediation / methods*
Nitric Oxide / chemistry*
Sulfur Dioxide / chemistry*

Substances

Air Pollutants
Coke
Sulfur Dioxide
Nitric Oxide
Carbon