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Adsorption and Oxidative Adsorption of Sulfur Dioxide on γ-Alumina

Nam, Suk Woo and Gavalas, George R. (1989) Adsorption and Oxidative Adsorption of Sulfur Dioxide on γ-Alumina. Applied Catalysis, 55 (1). pp. 193-213. ISSN 0166-9834. doi:10.1016/S0166-9834(00)82328-3.

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The adsorption and oxidative adsorption of SO_2 on γ-Al_2O_3 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 SO_2 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-Al_2O_3 was contacted with a mixture of SO_2 and O_2, adsorption of SO_2 and oxidation of the adsorbed SO_2 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 (SO_2-O_2-N_2;SO_2-N_2;O_2-N_2;N_2) strongly suggests that surface SO_2 and surface sulfate involve the same active sites such that SO_2 adsorption is inhibited by already formed sulfate. The results also indicate a broad range of site strengths.

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Gavalas, George R.0000-0003-1468-6835
Additional Information:© 1989 Elsevier Science Publishers B.V. Received 29 December 1988, revised manuscript received 12 July 1989.
Issue or Number:1
Record Number:CaltechAUTHORS:20151104-143220301
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61848
Deposited By: Ruth Sustaita
Deposited On:06 Nov 2015 20:24
Last Modified:10 Nov 2021 22:54

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