Adsorption of SO2on alumina

✍ Scribed by P. Fellner; J. Jurišová; V. Khandl; A. Sýkorová; J. Thonstad

• Book ID: 111490981
• Publisher: Versita
• Year: 2006
• Tongue: English
• Weight: 130 KB
• Volume: 60
• Category: Article
• ISSN: 0366-6352
• DOI: 10.2478/s11696-006-0055-3

✦ Synopsis

Abstract

The adsorption of SO2 on alumina used in the aluminium industry, the so-called smelter-grade alumina, was studied in the temperature range 15–120°C. It was found that at temperatures lower than 40°C, sulphur dioxide was bonded to alumina reversibly by physical forces, and the adsorption could be described satisfactorily by the Langmuir adsorption isotherm. The heat of adsorption was estimated to be −33 kJ mol−1. At temperatures ranging from 80°C to 120°C, which prevail in dry scrubbers in the aluminium industry, the heat of adsorption was determined to be −56 kJ mol−1. When SO2 was adsorbed at temperatures higher than 80°C, about 30 % of the SO2 could not be desorbed even if the samples were heated up to 250°C. In the presence of SO2 and oxygen, the formation of sulphate was observed at temperatures above 90°C.