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Matches in SemOpenAlex for { <https://semopenalex.org/work/W1986808539> ?p ?o ?g. }

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• W1986808539 abstract "NH3 stored on zeolites in the form of NH4+ ions easily reacts with NO to N2 in the presence of O2 at temperatures <373 K under dry conditions. Wet conditions require a modification of the catalyst system. It is shown that MnO2 deposited on the external surface of zeolite Y by precipitation considerably enhances the NOx conversion by zeolite fixed NH4+ ions in the presence of water at 400–430 K. Particle-size analysis, temperature-programmed reduction, textural characterization, chemical analysis, ESR and XRD gave a subtle picture of the MnO2 phase structure. The MnO2 is a non-stoichiometric, amorphous phase that contains minor amounts of Mn2+ ions. It loses O2 upon inert heating up to 873 K, but does not crystallize or sinter. The phase is reducible by H2 in two stages via intermediate formation of Mn3O4. The manufacture of extrudates preserving stored NH4+ ions for NOx reduction is described. It was found that MnO2 can oxidize NO by bulk oxygen. This enables the reduction of NO to N2 by the zeolitic NH4+ ions without gas-phase oxygen for limited time periods. The composite catalyst retains storage capacity for both, oxygen and NH4+ ions despite the presence of moisture and allows short-term reduction of NO without gaseous O2 or additional reductants. The catalyst is likewise suitable for steady-state DeNOx operation at higher space velocities if gaseous NH3 is permanently supplied." @default.
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• W1986808539 date "1999-12-01" @default.
• W1986808539 modified "2023-10-17" @default.
• W1986808539 title "Zeolite-mediated removal of NOx by NH3 from exhaust streams at low temperatures" @default.
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• W1986808539 doi "https://doi.org/10.1016/s0920-5861(99)00215-1" @default.
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