Alkali-promoted alumina catalysts. I. Chemisorption and oxygen exchange of carbon monoxide and carbon dioxide on potassium-promoted alumina catalysts

Journal Article · Sun Feb 01 04:00:00 EST 1981 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(81)90296-7· OSTI ID:6206422

Krupay, B W; Amenomiya, Y

Some potassium-promoted alumina catalysts were prepared by impregnating alumina with K/sub 2/CO/sub 3/ solutions. The catalysts were calcined at 620/sup 0/C before use. K/sub 2/CO/sub 3/ decomposed completely during calcination, but no potassium oxides or aluminates were formed on the surface. Oxygen exchange between those catalysts and C/sup 18/O/sub 2/ and C/sup 18/O was measured over a wide temperature range between 50 and 600/sup 0/C and compared with results obtained with alumina used as the support. It was found that potassium not only increased the number of exchangeable oxygens on the surface but also weakened the bond between these oxygens and the surface. The chemisorption of carbon monoxide and carbon dioxide was also investigated mainly by infrared spectroscopy. On the present K/sub 2/CO/sub 3//Al/sub 2/O/sub 3/ catalysts both gases showed distinctive ir bands, a pair of bands at 1590 and 1320 cm/sup -1/ and another pair of bands at 1570 and 1320 cm/sup -1/ depending on the temperature. The former pair was assigned to a CO/sub 2//sup -/ ion and the latter pair to a bidentate carbonate both attached on the potassium ion. The present results of oxygen exchange on K/sub 2/CO/sub 3//Al/sub 2/O/sub 3/ were successfully explained by assuming that the surface species assigned above are the intermediates of the exchange reaction with carbon monoxide and carbon dioxide, respectively.

• Research Organization: National Research Council of Canada, Ottawa, Ontario
• OSTI ID: 6206422
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 67:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400203 -- Isotope Exchange & Isotope Separation-- (-1987)
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCINATION
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CARBONATES
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COMPARATIVE EVALUATIONS
DECOMPOSITION
EVEN-EVEN NUCLEI
HIGH TEMPERATURE
INFRARED SPECTRA
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
NUCLEI
OXIDES
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
POTASSIUM CARBONATES
POTASSIUM COMPOUNDS
PYROLYSIS
REACTION INTERMEDIATES
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
STABLE ISOTOPES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES