Reactive adsorption of SO₂ on activated carbons with deposited iron nanoparticles

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• 作者：Javier A. Arcibar-Orozco^a ; J. Rene Rangel-Mendez^a ; ¹ ; ^{rene@ipicyt.edu.mx} ; Teresa J. Bandosz^b ; ^{tbandosz@ccny.cuny.edu} ; ^{tbandosz@sci.ccny.cuny.edu}
• 关键词：Activated carbon ; Iron oxyhydroxides ; Sulfur dioxide ; Desulfurization ; Nanoparticles ; Reactive adsorption
• 刊名：Journal of Hazardous Materials
• 出版年：2013
• 出版时间：15 February, 2013
• 年：2013
• 卷：246-247
• 期：Complete
• 页码：300-309
• 全文大小：959 K

文摘

The effect of iron particle size anchored on the surface of commercial activated carbon on the removal of SO₂ from a gas phase was studied. Nanosize iron particles were deposited using forced hydrolysis of FeCl₃ with or without H₃PO₄ as a capping agent. Dynamic adsorption experiments were carried out on either dry or pre-humidified materials and the adsorption capacities were calculated. The surface of the initial and exhausted materials was extensively characterized by microscopic, porosity, thermogravimetric and surface chemistry. The results indicate that the SO₂ adsorption capacity increased two and half times after the prehumidification process owing to the formation of H₂SO₄ in the porous system. Iron species enhance the SO₂ adsorption capacity only when very small nanoparticles are deposited on the pore walls as a thin layer. Large iron nanoparticles block the ultramicropores decreasing the accessibility of the active sites and consuming oxygen that rest adsorption centers for SO₂ molecules. Iron nanoparticles of about 3-4 nm provide highly dispersed adsorption sites for SO₂ molecules and thus increase the adsorption capacity of about 80 % . Fe₂(SO₄)₃ was detected on the surface of exhausted samples.