Abstract
The activity of CR-31 aluminum-oxide catalyst (La Roche Chemicals) over a period of 6.5 years (2000–2007) in the Claus reactor of byproduct-trapping shop 2 is monitored within the coke plant at OAO Magnitogorskii Metallurgicheskii Kombinat. The rate and extent of irreversible deactivation of the aluminum-oxide catalyst due to hydrothermal aging are found to be fundamentally different in the conversion of hydrogen sulfide than in the conversion of carbonyl sulfide. It is expedient to use different catalysts in different stages of sulfur extraction: in the first stage, the catalyst should be optimized for the conversion of organosulfur compounds; in the second stage, the best choice is a traditional aluminum-oxide catalyst for the Claus conversion of hydrogen sulfide.
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