Patent ID: 6475454
Filing Date: 2002-11-05
Classification: B01D,C01B

Abstract:
A method of selectively oxidizing carbon monoxide in a hydrogen-containing gas mixture, comprising the steps of:providing a gas mixture comprising hydrogen gas and carbon monoxide; providing an oxygen transfer catalyst having an oxidized state and a reduced state, the oxygen transfer catalyst in the oxidized/reduced state selected from the group consisting of silver oxide/silver, higher oxides of cerium/lower oxides of cerium, and combinations or mixtures thereof; and alternately performing the steps of: contacting the gas mixture with the oxygen transfer catalyst in the oxidized state at a temperature range at which the hydrogen gas is not substantially oxidized by the oxygen transfer catalyst, such that at least a portion of the carbon monoxide in the gas mixture is oxidized to carbon dioxide, and at least a portion of the oxygen transfer catalyst in the oxidized state is reduced to the reduced state; and reoxidizing the oxygen transfer catalyst in the reduced state to the oxidized state.