Browsing by Author "Guglielminotti, Eugenio"

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    Infra-red Study of Nitric Oxide Adsorption on Magnesium Oxide
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (1-6), 1974) Cerruti, Luigi; Modone, Eros; Guglielminotti, Eugenio
    An i.r. study of nitric oxide adsorption on high area MgO (previously degassed at 800°C) at room temperature is reported. The adsorption of NO onto MgO produces i.r. bands at 800–900 cm–1, 1100–1250 cm–1, and 1350–1450 cm–1. These absorption bands were assigned to several surface species: NO–2 ions with various configurations and NO– and N2O2–2 ions, co-ordinated to Mg2+ ions. The adsorption (3.3 × 1013 molecule cm–2, at 10.4 × 103 N m–2 of NO) occurs in limited surface zones.
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    Infrared Study of Carbon Monoxide Adsorption on Calcium and Strontium Oxides
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1981, 77 (05), 1981) Coluccia, Salvatore; Garrone, Edoardo; Guglielminotti, Eugenio
    CO adsorption on CaO and SrO takes place, as on MgO, via a disproportionation reaction leading to both surface carbonates and unusual surface species with a complex vibrational spectrum in the low-frequency range. These are thought to be negatively charged CO polymers, the simplest ones being (CO)2–2. A strong electrostatic interaction between negative species and surface cations accounts for the marked dependence of the infrared signal on the lattice parameter of the solids. The increasing basicity along the series MgO, CaO, SrO causes: (i) a marked increase in the total adsorptive capacity; (ii) an increase in the relative population of polymers with respect to dimers; (iii) an increase in the importance of a Boudouart-like reaction upon desorption.