Infrared study of CO and NO adsorption on alumina-supported iridium catalyst
Infrared spectroscopic measurements were performed for NO and CO adsorbed on reduced and oxidized ir supported on ..gamma..-Al/sub 2/O/sub 3/. Adsorption of NO on a reduced sample produced bands at 1900 and 1850 cm/sup -1/. These bands are attributed to NO adsorbed as NO/sup +delta/ on metal atoms of larger iridium crystallites (Site A) and on iridium atoms influenced strongly by the support (Site B), respectively. Spectra of NO adsorbed on an oxidized sample showed only a single band at 1950 cm/sup -1/. This band is assigned as NO/sup +delta/ on partially oxidized ir sites. CO adsorption on a reduced sample produced bands at 2070-2060 and 2020 cm/sup -1/, which are associated with CO linearly bonded to Site A and Site B, respectively. Oxidation of the sample and subsequent adsorption of CO caused a band only at 2060 cm/sup -1/, which is assigned as CO linearly bonded to Site A. Detailed investigations were made on the effect of the pressure, adsorption temperature, and evacuation at different temperatures on the intensities of the above bands. 7 figures, 3 tables.
- Research Organization:
- Univ. of Szeged, Hungary
- OSTI ID:
- 6874286
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 62:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
INFRARED SPECTRA
IRIDIUM
METALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PRESSURE DEPENDENCE
REFRACTORY METALS
SORPTION
SPECTRA
TRANSITION ELEMENTS