The United States of America As Represented by the Administrator of the

Electric Power Research Institute Incorporated

Gas Desulfurization Corp.

Vinod Jalan

William G Wilson

D Alan Kay

Margaret A Reid

Jo Ann Charleston

David G Frost

A process for optimizing the removal of nitrogen oxide (NO.sub.x) and sulfur oxide (SO.sub.X) from flue gases is provided in which the flue gases pass over a lanthanide-oxygen-sulfur catalyst. The catalyst has active sites provided on its surface which promote the dissociation of NO.sub.X and receive and entrap oxygen released during the dissociation of the NO.sub.X. While the flue gases pass over the catalyst, a reducing gas contacts the catalyst to reduce the oxygen on the active sites of the catalyst and permit the catalyst to continue to promote the dissociation of the NO.sub.x in the flue gas. If the flue gases contain SO.sub.X, they are then passed over a solid solution having a solvent of a first lanthanide oxide compound which crystallizes in the fluorite habit and a solute of at least one altervalent oxide of a second lanthanide. The SO.sub.X in the flue gases reacts with the solid solution to form a sulfated lanthanide oxide which is removed from the flue gases. The sulfated lanthanide oxide may then be dissociated by raising its temperature to regenerate the lanthanide oxide.

Process for optimizing the removal of NO.sub.X and SO.sub.X from gases

Novel titanium carbide catalyst supports and platinum/titanium carbide electrocatalysts are provided for use as electrodes in fuel cells. In particular, the novel catalysts are useful as electrodes for the reduction of oxygen in phosphoric acid fuel cells.

Fuel cell electrocatalyst support comprising an ultra-fine

Referring to FIG. 1, a method for making an improved electrode 15 having a gold coating 9 for use in the anode compartment 12 of a REDOX cell 10 is described. The anode fluid utilizes a chromic/chromous couple. The flow chart FIG. 2 illustrates the method wherein a carbon felt is soaked in methanol, rinsed in water, dried and then heated in KOH after which it is again washed in deionized water and dried. The felt is then moistened with a methanol-water solution containing chloroauric acid and is stored in a dark place while still in contact with the gold-containing solution. After all the gold-containing solution is absorbed by the felt, the latter is dried by heat and then heat-treated at a substantially greater temperature. The felt is now suitable for use as an electrode and is wetted with water or up to 2 molar HCl prior to installation in a REDOX cell. The two curves on the far right of FIG. 3 illustrate the low hydrogen evolution of the improved electrode.

Chromium electrodes for REDOX cells

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Concord, MA, United States of America

Vinod Jalan