CHEMISTRY OF SO2 AND DESOX PROCESSES ON OXIDE NANOPARTICLES.

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On bulk stoichiometric oxides, SO{sub 2} mainly reacts with the O centers to form SO{sub 3} or SO{sub 4} species that decompose at elevated temperatures. Adsorption on the metal cations occurs below 300 K and does not lead to cleavage of the S-O bonds. In bulk oxides, the occupied cation bands are too stable for effective bonding interactions with the LUMO of SO{sub 2}. The effects of quantum confinement on the electronic properties of oxide nanoparticles and the structural defects that usually accompany these systems in general favor the bonding and dissociation of SO{sub 2}. Thus, nanoparticles of MgO, CaO, ... continued below

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33 pages

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RODRIGUEZ, J.A. June 30, 2006.

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On bulk stoichiometric oxides, SO{sub 2} mainly reacts with the O centers to form SO{sub 3} or SO{sub 4} species that decompose at elevated temperatures. Adsorption on the metal cations occurs below 300 K and does not lead to cleavage of the S-O bonds. In bulk oxides, the occupied cation bands are too stable for effective bonding interactions with the LUMO of SO{sub 2}. The effects of quantum confinement on the electronic properties of oxide nanoparticles and the structural defects that usually accompany these systems in general favor the bonding and dissociation of SO{sub 2}. Thus, nanoparticles of MgO, CaO, SrO, Al{sub 2}O{sub 3}, Fe{sub 2}O{sub 3} and CeO{sub 2} are all more efficient for sequestering SO{sub 2} than the corresponding bulk oxides. Structural imperfections in pure or metal-doped ceria nanoparticles accelerate the reduction of SO{sub 2} by CO by facilitating the formation and migration of O vacancies in the oxide surface.

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33 pages

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  • Report No.: BNL--76856-2006-BC
  • Grant Number: DE-AC02-98CH10886
  • DOI: 10.2172/893860 | External Link
  • Office of Scientific & Technical Information Report Number: 893860
  • Archival Resource Key: ark:/67531/metadc889759

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  • June 30, 2006

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 12, 2016, 8:09 p.m.

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RODRIGUEZ, J.A. CHEMISTRY OF SO2 AND DESOX PROCESSES ON OXIDE NANOPARTICLES., report, June 30, 2006; [Upton, New York]. (digital.library.unt.edu/ark:/67531/metadc889759/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.