Infrared study of the adsorption of NO on the reduced and oxidized forms of silica-supported Ru
The infrared spectra of NO adsorbed on the reduced and oxidized forms of supported Ru have been recorded. (An oxidized Ru sample was made by exposing a reduced sample to 50 Torr of O/sub 2/ at 325/sup 0/C.) For NO adsorbed on an oxidized 6% Ru--silica sample, a strong sharp band at 1880 cm/sup -1/ is observed, and this band is assigned to ..nu../sub (NO)/ for NO adsorbed on an oxygen-perturbed Ru surface site. NO adsorbed on the oxidized form of Ru is stable both to evacuation up to temperatures of 325/sup 0/C and to H/sub 2/ (g) up to temperatures of 200/sup 0/C. When NO is adsorbed on a reduced 6% Ru--silica sample, N/sub 2/O (g) is detected, and the oxygen species formed in this reduction is adsorbed on the Ru--silica surface. Three bands are observed in the infrared spectra: a band at 1630 cm/sup -1/ assigned to ..nu../sub (NO)/ for Ru/sup delta +/-NO/sup delta-/, a band at 1820 cm/sup -1/ assigned to ..nu../sub (NO)/ for Ru/sup delta/sup -/-NO/sup delta/sup +//, and a band at 1860 cm/sup -1/ assigned to ..nu../sub (NO)/ for NO adsorbed on an oxygen-perturbed Ru surface site. When a reduced Ru--silica sample with full NO surface coverage is heated, we observe an intensification of the high-frequency NO band; however, if this sample is heated to 125/sup 0/C in the presence of a reducing gas, i.e., H/sub 2/, the surface species react, and the frequencies of the infrared bands are shifted to lower wave numbers.
- Research Organization:
- Univ. of Rhode Island, Kingston
- OSTI ID:
- 5361308
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 47:3; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330701 -- Emission Control-- Nitrogen Oxides
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
ELEMENTS
INFRARED SPECTRA
METALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
POLLUTION CONTROL EQUIPMENT
REFRACTORY METALS
RUTHENIUM
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
TRANSITION ELEMENTS