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- W1530763839 abstract "The chemistry involved in the selective catalytic reduction of nitrogen oxides in automobile exhaust is outlined, and the requirements of a practical NO/sub x/ reduction catalyst are summarized. Critical reactions for the removal of NO/sub x/ are likely to be hydrogenation (with a mechanism proceeding through ammonia or some other NHn species) and/or the oxidation of carbon monoxide with the intermediary of surface N species or even isocyanates. Laboratory studies of NO/sub x/ reduction catalysts indicate the following: ruthenium is the most effective catalytic material at high values of the reducing power index of the gas mixture (i.e., high CO or low O/sub 2/ levels); rhodium is most effective over a narrow range of the reducing power index and can operate closer to stoichiometric than the other active species tested; base metal catalysts behave like Ru catalysts but require higher temperatures of operation; and platinum alone is relatively ineffective whatever the conditions of use. Limited endurance data obtained from dynamometer tests indicate it is possible to control hydrocarbons, CO, and NO/sub x/ emissions simultaneously within the old 1976 limits for at least 10,000 mi on small displacement vehicles using a dual-catalyst system." @default.
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- W1530763839 date "1974-02-01" @default.
- W1530763839 modified "2023-09-23" @default.
- W1530763839 title "Nitrogen Oxide Removal Catalysts for Purification of Automobile Exhaust Gases" @default.
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- W1530763839 doi "https://doi.org/10.4271/740249" @default.
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