Catalyst coke

  In many catalytic operations (e.g., catalytic cracking), carbon is deposited on the catalyst, thus deactivating the catalyst. The catalyst is reactivated by burning off the carbon, which is used as a fuel in the refining process. This carbon or coke is not recoverable in a concentrated form.
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary

Energy terms . 2014.

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