Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 211, Issue -, Pages 421-429Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.10.013
Keywords
AC-K; Potassium carbonate; COS adsorption; COS desorption mechanism
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Funding
- Energy Efficiency and Resources Programs of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry and Energy, Republic of Korea [20163010050080]
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To maximize the adsorption of COS (carbonyl sulfide) gas, activated carbon (AC) with a large surface area was modified with K as a low-cost adsorbent capable of bonding at low temperatures with the S in COS. The contents of AC and K were fixed at 80% and 20%, respectively. The COS gas was dynamically adsorbed by AC-K at an optimum temperature of 210 degrees C with a sulfur-adsorption capacity of 56.1 mg/g. The structure of the K adsorbent was confirmed as K2CO3 via X-ray diffraction and the K components were highly dispersed on the surface of the AC, as indicated by SEM and EDAX analyses. Furthermore, the correlation between the specific surface area of AC-K and COS adsorption was examined using FT-IR, XPS, and MASS analyses. The mechanisms by which the COS adsorbed/desorbed from the adsorbent were determined and an overall mechanism describing COS adsorption behavior was proposed.
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