Abstract
Y-type zeolites modified with aluminium and activated at temperature below 470 K has bee found to be an effective catalyst for the Claus reaction. The activity of this modified form is higher than that of NaY pretreated under the same conditions. The basic OH groups are believed to be active centers involved in the catalytic process. Removal of these groups by means of high-temperature treatment or fluorination of the sample brings about a considerable decrease in the catalytic activity.
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