Adsorption Characteristics of Nitric Oxide and Sulfur Dioxide on Coal Activated Carbon

Abstract:

The aim of this paper is to study the adsorption characteristics of nitric oxide (NO) and sulfur dioxide (SO₂) on raw coal activated carbon over temperature ranged 298～343K using a static volumetric adsorption apparatus. The adsorption equilibrium data for NO and SO₂ were fitted to Freundlich, Dubinin-Radushkevich (D-R) and Sips adsorption isotherm model. Isosteric heat of adsorption was determined by the Clausius-Clapeyron equation. It was found that Sips adsorption isotherm model is more suitable for description of NO adsorption process at 298K, 313K and 328K and SO₂ adsorption process at 313K, 328K and 343K, however, D-R adsorption isotherm model is more suitable for description of the NO adsorption process at 343K and SO₂ adsorption process at 298K. The isosteric heat of adsorption values of SO₂ increase slightly as the adsorbed amounts increasing from 0.8 to 1.6mg/g, but the isosteric heat of adsorption values of NO show a converse trend. Meanwhile, NO and SO₂ adsorbed on coal activated carbon at the four temperatures may be a dominant of physical adsorption.

• Periodical: Advanced Materials Research (Volumes 383-390)
• Pages: 3056-3062
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.383-390.3056
• Online since: November 2011
• Authors: Dong Juan Kang, Xiao Long Tang, Jin Hui Peng, Hong Hong Yi, Ping Ni, Zhi Qing Ye, Kai Li
• Keywords: Activated Carbon (AC), Adsorption Isotherm Equation, NO, SO₂

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