Adsorption and oxidative adsorption of sulfur dioxide on γ-alumina

Suk Woo Nam; George R. Gavalas

doi:10.1016/S0166-9834(00)82328-3

Adsorption and oxidative adsorption of sulfur dioxide on γ-alumina

Suk Woo Nam, George R. Gavalas

GREEN SCHOOL (Graduate School of Energy and Environment)

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

The adsorption and oxidative adsorption of SO₂ on γ-Al₂O₃ have been investigated at temperatures of 500-700°C by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). At temperatures above 500°C the adsorbed SO₂ species was characterized by an IR band at 1065 cm^-1. The equilibrium coverage and initial rate of adsorption decreased with temperature, suggesting a two-step adsorption. When γ-Al₂O₃ was contacted with a mixture of SO₂ and O₂, adsorption of SO₂ and oxidation of the adsorbed SO₂ to a surface sulfate characterized by broad IR bands at 1070 cm^-1 and 1390 cm^-1 took place. Sulfate formation was found to be reversible, but the reverse reaction took several hours even at 700°C. The results of a series of TGA experiments under different atmospheres (SO₂O₂N₂;SO₂N₂;O₂N₂;N₂) strongly suggests that surface SO₂ and surface sulfate involve the same active sites such that SO₂ adsorption is inhibited by already formed sulfate. The results also indicate a broad range of site strengths.

Original language	English
Pages (from-to)	193-213
Number of pages	21
Journal	Applied Catalysis
Volume	55
Issue number	1
DOIs	https://doi.org/10.1016/S0166-9834(00)82328-3
Publication status	Published - 1989

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General Engineering

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title = "Adsorption and oxidative adsorption of sulfur dioxide on γ-alumina",

abstract = "The adsorption and oxidative adsorption of SO2 on γ-Al2O3 have been investigated at temperatures of 500-700°C by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). At temperatures above 500°C the adsorbed SO2 species was characterized by an IR band at 1065 cm-1. The equilibrium coverage and initial rate of adsorption decreased with temperature, suggesting a two-step adsorption. When γ-Al2O3 was contacted with a mixture of SO2 and O2, adsorption of SO2 and oxidation of the adsorbed SO2 to a surface sulfate characterized by broad IR bands at 1070 cm-1 and 1390 cm-1 took place. Sulfate formation was found to be reversible, but the reverse reaction took several hours even at 700°C. The results of a series of TGA experiments under different atmospheres (SO2O2N2;SO2N2;O2N2;N2) strongly suggests that surface SO2 and surface sulfate involve the same active sites such that SO2 adsorption is inhibited by already formed sulfate. The results also indicate a broad range of site strengths.",

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T1 - Adsorption and oxidative adsorption of sulfur dioxide on γ-alumina

AU - Nam, Suk Woo

AU - Gavalas, George R.

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N2 - The adsorption and oxidative adsorption of SO2 on γ-Al2O3 have been investigated at temperatures of 500-700°C by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). At temperatures above 500°C the adsorbed SO2 species was characterized by an IR band at 1065 cm-1. The equilibrium coverage and initial rate of adsorption decreased with temperature, suggesting a two-step adsorption. When γ-Al2O3 was contacted with a mixture of SO2 and O2, adsorption of SO2 and oxidation of the adsorbed SO2 to a surface sulfate characterized by broad IR bands at 1070 cm-1 and 1390 cm-1 took place. Sulfate formation was found to be reversible, but the reverse reaction took several hours even at 700°C. The results of a series of TGA experiments under different atmospheres (SO2O2N2;SO2N2;O2N2;N2) strongly suggests that surface SO2 and surface sulfate involve the same active sites such that SO2 adsorption is inhibited by already formed sulfate. The results also indicate a broad range of site strengths.

AB - The adsorption and oxidative adsorption of SO2 on γ-Al2O3 have been investigated at temperatures of 500-700°C by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). At temperatures above 500°C the adsorbed SO2 species was characterized by an IR band at 1065 cm-1. The equilibrium coverage and initial rate of adsorption decreased with temperature, suggesting a two-step adsorption. When γ-Al2O3 was contacted with a mixture of SO2 and O2, adsorption of SO2 and oxidation of the adsorbed SO2 to a surface sulfate characterized by broad IR bands at 1070 cm-1 and 1390 cm-1 took place. Sulfate formation was found to be reversible, but the reverse reaction took several hours even at 700°C. The results of a series of TGA experiments under different atmospheres (SO2O2N2;SO2N2;O2N2;N2) strongly suggests that surface SO2 and surface sulfate involve the same active sites such that SO2 adsorption is inhibited by already formed sulfate. The results also indicate a broad range of site strengths.

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Adsorption and oxidative adsorption of sulfur dioxide on γ-alumina

Abstract

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