| The use of rice hulls for sustainable control of NOx emissions in deep space missions (2001) | |||||||||||
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| The Use Rice Hulls for Sustainable Control NOx Emissions Deep Space Missions Shi and Chang Environmental Energy Technology Division Lawrence Berkeley National Laboratory Berkeley Fisher Pisharody Moran and Wignarajah Astrobiology Technology Branch NASA Ames Research Center Moffett Field Abstract The use the activated carbon produced from rice hulls control NOx emissions for the future deep space missions has been demonstrated The optimal carbonization temperature range was found between and The burnoff was found pyrolysis and activation The BET surface area the activated carbon from rice hulls was determined m when prepared The presence oxygen flue gas essential for effective adsorption the activated carbon the contrary water vapor inhibits the adsorption efficiency Consequently water vapor flue gas should removed drying agents before adsorption ensure high adsorption efficiency All the flue gas was removed for more than one and half hours when oxygen was present and using ratio the carbon weight the flue gas flow rate min The reduction the adsorbed form can effectively accomplished under anaerobic conditions For saturated activated carbon the loss carbon mass was determined about the activated carbon per cycle regeneration The reduction the adsorbed also regenerates the activated carbon The regenerated activated carbon exhibits improved adsorption efficiency Introduction Human space travel depends upon the operation life support systems deep space missions such the mission M | |||||||||||
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