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Insights into the twofold role of Cs doping on
cobalt spinel
mechanistic steps
alkali doping
surface oxygen species
cesium
work function
Cobalt spinel catalysts promoted with different cesium loadings from various precursors (Cs2CO3, CsNO3, CH3COOCs, and CsOH) were prepared by incipient wetness impregnation. The catalysts were characterized by XRF, XRD, SEM, XPS and Raman Spectroscopy. The work function studies were used to optimized the surface doping and monitor the retention of surface oxygen. The stability of cesium promoter was evaluated by means of species resolved – thermal alkali desorption method. The catalytic activity of N2O decomposition over the synthesized catalysts was studied by temperature programmed reaction. The role of cesium precursor was evaluated in terms of dispersion and the nature of the counterion. The results show that the most active deN2O catalysts are obtained for cesium carbonate at the narrow loading range of 2–3 atoms/nm2 (complete N2O conversion at T < 200 °C). The twofold promotional effect is discussed in terms of modification of the electronic properties of the spinel catalyst (stimulation of dissociation step: N2O + e = N2 + O–) and stability of the surface oxygen species (recombination step: O– = ½O2 + e).
cris.lastimport.scopus | 2024-04-07T17:54:25Z | |
dc.abstract.en | Cobalt spinel catalysts promoted with different cesium loadings from various precursors (Cs2CO3, CsNO3, CH3COOCs, and CsOH) were prepared by incipient wetness impregnation. The catalysts were characterized by XRF, XRD, SEM, XPS and Raman Spectroscopy. The work function studies were used to optimized the surface doping and monitor the retention of surface oxygen. The stability of cesium promoter was evaluated by means of species resolved – thermal alkali desorption method. The catalytic activity of N2O decomposition over the synthesized catalysts was studied by temperature programmed reaction. The role of cesium precursor was evaluated in terms of dispersion and the nature of the counterion. The results show that the most active deN2O catalysts are obtained for cesium carbonate at the narrow loading range of 2–3 atoms/nm2 (complete N2O conversion at T < 200 °C). The twofold promotional effect is discussed in terms of modification of the electronic properties of the spinel catalyst (stimulation of dissociation step: N2O + e = N2 + O–) and stability of the surface oxygen species (recombination step: O– = ½O2 + e). | pl |
dc.affiliation | Wydział Chemii : Zakład Chemii Nieorganicznej | pl |
dc.contributor.author | Grzybek, Gabriela - 126231 | pl |
dc.contributor.author | Stelmachowski, Paweł - 147943 | pl |
dc.contributor.author | Gudyka, Sylwia - 186938 | pl |
dc.contributor.author | Duch, Joanna - 190535 | pl |
dc.contributor.author | Ćmil, Katarzyna | pl |
dc.contributor.author | Kotarba, Andrzej - 129229 | pl |
dc.contributor.author | Sojka, Zbigniew - 131982 | pl |
dc.date.accessioned | 2015-06-26T11:10:28Z | |
dc.date.available | 2015-06-26T11:10:28Z | |
dc.date.issued | 2015 | pl |
dc.description.admin | [AB] Ćmil, Katarzyna 50000141 | pl |
dc.description.physical | 509-514 | pl |
dc.description.volume | 168-169 | pl |
dc.identifier.doi | 10.1016/j.apcatb.2015.01.005 | pl |
dc.identifier.eissn | 1873-3883 | pl |
dc.identifier.issn | 0926-3373 | pl |
dc.identifier.uri | http://ruj.uj.edu.pl/xmlui/handle/item/10493 | |
dc.language | eng | pl |
dc.language.container | eng | pl |
dc.rights.licence | bez licencji | |
dc.subject.en | cobalt spinel | pl |
dc.subject.en | $N_2O$ decomposition | pl |
dc.subject.en | $Co_3O_4$ | pl |
dc.subject.en | mechanistic steps | pl |
dc.subject.en | alkali doping | pl |
dc.subject.en | surface oxygen species | pl |
dc.subject.en | cesium | pl |
dc.subject.en | work function | pl |
dc.subtype | Article | pl |
dc.title | Insights into the twofold role of Cs doping on $deN_2O$ activity of cobalt spinel catalyst : towards rational optimization of the precursor and loading | pl |
dc.title.journal | Applied Catalysis. B, Environmental | pl |
dc.type | JournalArticle | pl |
dspace.entity.type | Publication |