| 摘要 |
A carbonized, unsupported nonstoichiometric vanadium sulfide catalyst is regenerated by way of a three-stage treatment at elevated temperatures. In the first stage, carbon is removed from the catalyst by contacting with elemental sulfur at an elevated temperature in the range of about 500 DEG to about 1,000 DEG C. The substantially carbon-free catalyst is treated with a mineral acid, or anhydrous HF, to dissolve metallic contaminants, and further treated in a third stage with elemental sulfur at a temperature in the range of 300 DEG to about 500 DEG C. to form vanadium tetrasulfide.
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