DEVELOPMENT OF NOVEL SOLID SORBENTS FOR THERMAL SWING SORPTION AND DECOMPOSITION OF DILUTE NOX

The NO sorption/desorption properties of substituted layered cuprates，D22-x D2Sr - D21+x D2Cu - D22- D2O - D26 - D2have been studied to use them as an Nox storage material. The cumulative amount as well as Theinitial rate of NO uptake at 250℃increased with Sr-substitution, xgiving rise to the maximum at x= 1.4，where a mixture of a orthorhombic layered cuprate and two binary oxides (Sr - D22 - D2CuO - D23 - D2 andSrCuO D22 D2) was produced. The latter binary oxides should play a key role in promoting Theoxidation of NO and thus solid-gas reactions with the layered cuprate phase，这是accompanied by the formation of nitrate and nitrite species. absorbed NO was liberatedreversibly when heated at 200-600℃. Sorption/desorption of NO could be cycled by employingtemperature-swing operation.2. Sorption/desorption properties of Nox over ZrO D22 -based oxidesare studied to use them as solid sorbents for NOx removal at low temperatures（<150℃），impregnation of 1mol…More %PdO onto ZrO D22 - D2 increased the NO uptake in the presence of O D22 - D2 bypromoting the oxidation of NO to NO D22 D2 and the subsequent formation of nitrate adsorbates. thereversible sorption/desorption cycles could be repeated even in the presence of CO - 22 - 2 byapplying temperature swing operation between 30 and 500℃. Interaction of NO - D2x - D2 withMnO D2x D2- ceo D22 - D2 binary oxides are studied to use them for sorptive NO D2x D2 removal at低温度（<150℃），The formation of MnO - D2x - D2- ceo - D22 - D2 solid solutions with The fluorite-type structure at n≤0.5was found to be quite effective in accelerating NO - D2x - D2 The cumulative NO - D2x - D2 uptake wasincreased by decreasing the reaction temperature and/or by increasing the O D22 - D2 concentration，indicative of chemisorption via oxidation of NO/NO D22 D2. These adsorbates are produced byoxidative adsorption,which is caused by NO oxidation to NO D22 by lattice oxygens bound to Mn and subsequentcoordination to Ce in adjacent sites. Less

1. The NO sorption/desorption properties of substituted layered cuprates, LaィイD22-xィエD2SrィイD21+xィエD2CuィイD22ィエD2OィイD26ィエD2, have been studied to use them as an Nox storage material. The cumulative amount as well as the initial rate of NO uptake at 250℃ increased with Sr-substitution, x, giving rise to the maximum at x= 1.4, where a mixture of a orthorhombic layered cuprate and two binary oxides (SrィイD22ィエD2CuOィイD23ィエD2 and SrCuOィイD22ィエD2) was produced. The latter binary oxides should play a key role in promoting the oxidation of NO and thus solid-gas reactions with the layered cuprate phase, which is accompanied by the formation of nitrate and nitrite species. The absorbed NO was liberated reversibly when heated at 200-600℃. Sorption/desorption of NO could be cycled by employing temperature-swing operation.2. Sorption/desorption properties of Nox over ZrOィイD22ィエD2-based oxides are studied to use them as solid sorbents for NOx removal at low temperatures (<150℃), The impregnation of 1mol … More %PdO onto ZrOィイD22ィエD2 increased the NO uptake in the presence of OィイD22ィエD2 by promoting the oxidation of NO to NOィイD22ィエD2 and the subsequent formation of nitrate adsorbates. The reversible sorption/desorption cycles could be repeated even in the presence of COィイD22ィエD2 by applying temperature swing operation between 30 and 500℃.3. Interaction of NOィイD2xィエD2 with MnOィイD2xィエD2-CeOィイD22ィエD2 binary oxides are studied to use them for sorptive NOィイD2xィエD2 removal at low temperatures (<150℃), The formation of MnOィイD2xィエD2-CeOィイD22ィエD2 solid solutions with the fluorite-type structure at n≦0.5 was found to be quite effective in accelerating NOィイD2xィエD2. The cumulative NOィイD2xィエD2 uptake was increased by decreasing the reaction temperature and/or by increasing the OィイD22ィエD2 concentration, indicative of chemisorption via oxidation of NO/NOィイD22ィエD2. These adsorbates are produced by oxidative adsorption, which is caused by NO oxidation to NOィイD22ィエD2 by lattice oxygens bound to Mn and subsequent coordination to Ce in adjacent sites. Less