Abstract
The General Atomic Company off-gas treatment system is designed to process simulated radioactive or other noxious volatile and gaseous constituents in dissolver off-gas (DOG) streams indigenous to several nuclear fuel cycles, e.g., light-water reactors (LWRs). A series of NO/sub x/ converter tests was carried out with the GA engineering-scale system. The major reactions and optimum conditions were characterized for the selective catalytic reduction of pure NO, pure NO/sub 2/, and NO/sub x/ with NH/sub 3/ over synthetic hydrogen mordenite (Zeolon 900 H). Steady-state conversions in the range 99 to 99.9% were obtained for the specified conditions without observing any breakthrough of NH/sub 3/ in the effluent. The NO/sub x/ reduction capacity for a single-stage adiabatic converter is approximately 1% NO/sub x/ in the feed gas and is restricted by catalyst temperature limitations. 7 references, 9 figures. (JMT)
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