of substantially one atmosphere pressure usually the temperature is the same temperature at which absorption was carried out for economic reasons but there is no actual limitation on the temperature provided that it is within the range set forth above the gaseous stream may be conducted through the regeneration chamber at a fairly wide range of flow rates the optimum flow rate will depend upon such variables as the temperature of the reaction pressure and particle size or channel size in the case of certain supports the flow rate is measured by the gaseous volumes of the regeneration stream including the carrier and reactive gases per volume of chamber containing catalyst absorber per hour referred to as the gas hourly space velocity ghsv the ghsv for the present regenerations may be in the range of 10 hr 1 to 100 000 hr 1 preferably at least 100 hr 1 and less than 30 000 hr 1 more preferably in the range of 500 hr 1 to 16 000 hr 1 the regeneration time is determined by the stoichmetries i e moles absorbed and the concentration of the reactant gas and the flow rate of the regeneration gas the regeneration reactions are rapid and completion of regeneration can be determined by monitoring the off gas for reactant gases usually the regenerations within the preferred temperature range will require at least about 2 minutes to about 10 minutes at temperatures substantially the preferred range regenerations can require up to an hour efficiencies of up to 99 9 for nitrogen oxide reactions to nitrogen and water can occur during the regeneration carbon dioxide up to at least about 10 may be added to regeneration gases containing hydrogen to regenerate the carbonate form the regeneration system of the present invention works with both non.