3870.  WATSON, C. W. (The Texas Co.). Catalyst Regeneration. United States Patent 2,635,110, Apr. 14, 1953. Chem. Abs., vol. 47, 1953, p. 6637.

A catalyst, which has accumulated objectionable deposits of C during its use for the synthesis of hydrocarbons from CO and H₂ is regenerated by contact with CO₂ at a temperature materially above the temperature of the synthesis reaction and at which the CO and C are caused to react to form CO, preferably in the range 760°-816°. The upper temperature limit is controlled only by the adverse effect of the high temperature limit is controlled only by the adverse effect of the high temperature upon the catalyst. The CO₂ supplied to the regenerator is preheated by direct heat exchange with the hot-regenerated catalyst, and the contaminated catalyst supplied to the regenerator is preheated by indirect heat exchange with the gaseous products from the regenerator. The temperature in the regenerator is maintained by introducing a limited amount of O₂ in to the regenerator. Small amounts of H₂ in the CO₂, for example, 2% are beneficial, but the moisture content is best maintained as low as possible—for example, not over 0.01%.

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