Investigation of calcium aluminates by IR spectroscopy in diffusely scattered light
The hydroxyl covering and the adsorption sites for CO and H/sub 2/O on aluminum-calcium catalysts and supports with developed surfaces have been studied by IR spectroscopy in diffusely scattered light. The presence of several types of surface OH groups, viz., terminal groups bonded to calcium ions with different types of coordination, bridging OH groups, and groups appearing in (CaOH)/sup +/ groupings, which perform the role of compensating cations in the zeolite-like structure of calcium aluminates, has been established. The shifts of the bands of the OH groups upon the adsorption of C/sub 6/H/sub 6/ and cyclo-C/sub 6/H/sub 12/ point out their weakly acidic or basic character. When calcium aluminates are dehydroxylated, aprotic sites appear on their surfaces, and the rehydration of such surfaces is accompanied by the formation of OH groups and the weakening of the Al-O-M bonds (M = Al, Ca) with the appearance of additional sites for the strong adsorption of water.
- Research Organization:
- N.D. Zelinskii Institute of Organic Chemistry, Moscow (USSR)
- OSTI ID:
- 5971801
- Journal Information:
- Kinet. Catal. (Engl. Transl.); (United States), Vol. 29:4; Other Information: Translated from Kinet. Katal.; 29: No. 4, 891-896 (Jul-Aug 1988)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINATES
CATALYTIC EFFECTS
CALCIUM COMPOUNDS
CATALYSTS
INFRARED SPECTRA
ADSORBENTS
ADSORPTION
ALUMINIUM OXIDES
BENZENE
BINDING ENERGY
CALCIUM OXIDES
CARBON DIOXIDE
CARBON MONOXIDE
CATALYST SUPPORTS
CYCLOHEXANE
DEUTERIUM
HEAVY WATER
HYDRATION
HYDROXYL RADICALS
ISOTOPE EFFECTS
ISOTOPIC EXCHANGE
LIGHT SCATTERING
SORPTIVE PROPERTIES
SPECTRAL SHIFT
VIBRATIONAL STATES
WATER
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALUMINIUM COMPOUNDS
AROMATICS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CYCLOALKANES
ENERGY
ENERGY LEVELS
EXCITED STATES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADICALS
SCATTERING
SOLVATION
SORPTION
SPECTRA
STABLE ISOTOPES
SURFACE PROPERTIES
400201* - Chemical & Physicochemical Properties