Abstract
Carbon consumption of activated carbon varies with sulfur-containing products. In this work, differential thermogravimetric (DTG), electron paramagnetic resonance (ESR), X-ray photoelectron spectroscopy (XPS), and temperature programmed desorption (TPD) we re used to reveal the adsorption-regeneration process of H2S and the effect of adsorption products on carbon consumption. The results show that H2S reacts with the C=C bond to form the C-S bond as an intermediate state, followed by the formation of elemental sulfur. It directly sublimates at approximately 380 °C, about 30 °C higher than the decomposition temperature of H2SO4. In the thermal regeneration process, the elemental sulfur in the form of monoclinic sulfur (S8) first breaks into infinitely long chain molecules (S∞) and then into small molecules, finally into sulfur vapor. The desorption of elemental sulfur consumes less oxygen and carbon functional groups, reducing the chemical carbon consumption by 59.8% than H2SO4; moreover, the compressive strength reduces less due to its slight effect on the disordered graphitic structure. H2S also reacts with the C=O bond to form H2SO3 or H2SO4. The desorption of H2SO3 does not require carbon consumption. The decomposition of H2SO4 needs to react with the C=C bond to release SO2, CO2, and CO, and the compressive strength of activated carbon significantly decreases. The carbon consumption originates from two aspects; the one from the regeneration of sulfur-containing products is more than twice the other one from the decomposition of oxygen-containing functional groups.
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This work was supported by the National Key Research and Development Program of China (No. 2017YFC0210600) and the National Natural Science Foundation of China (No. U1810209). The role of the funding body is in the design of the study, analysis, and interpretation of data.
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Yuting Lin: Conceptualization, methodology, formal analysis, writing—original draft preparation
Yuran Li: Resources, writing—review and editing
Zhicheng Xu: Visualization, investigation
Junxiang Guo: Supervision
Tingyu Zhu: Resources, supervision
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Lin, Y., Li, Y., Xu, Z. et al. Carbon consumption and adsorption-regeneration of H2S on activated carbon for coke oven flue gas purification. Environ Sci Pollut Res 28, 60557–60568 (2021). https://doi.org/10.1007/s11356-021-14914-2
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DOI: https://doi.org/10.1007/s11356-021-14914-2