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An EPR study of physi- and chemisorption of NO on MgO: Effect of outgassing temperature and nature of surface sites

Paper ID Volume ID Publish Year Pages File Format Full-Text
47893 46485 2008 7 PDF Available
Title
An EPR study of physi- and chemisorption of NO on MgO: Effect of outgassing temperature and nature of surface sites
Abstract

The interaction of NO molecules with the surface of MgO has been studied by EPR as a function of outgassing temperature. Two different types of paramagnetic species are identified by EPR: physisorbed NO and chemisorbed NO22−. They are formed upon specific adsorption of NO on Lewis acidic Mg2+ and basic O2− sites, respectively. The concentration of NO and NO22− radicals depends on the outgassing temperature of MgO reaching a maximum at 1073 K. FT-IR measurements suggest that sites liberated upon thermal outgassing by removal of OH and carbonate groups adsorbed on MgO play a significant role in the increase of the concentrations of NO and NO22− radicals. The latter are possibly formed on low coordinated oxide ions close to cationic vacancies or O4C2− of monoatomic step and O3C2− from kinks and divacancies.

Keywords
MgO; Surface; Low coordination; NO; Probe; Physisorption; Chemisorption; EPR; FT-IR; Acidic sites; Basic sites; Outgassing temperature
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An EPR study of physi- and chemisorption of NO on MgO: Effect of outgassing temperature and nature of surface sites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 1–2, 25 October 2008, Pages 58–64
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us