Infrared study of carbon deposits on catalysts
The deposition of carbon on alumina and on catalysts, in which alumina was the support for platinum and rhenium, was followed by simultaneously weighing the total deposit and observing the infrared spectra. At total carbon deposit levels of 1 percent or less, produced by exposure to acetylene at 525 K or ethylene at 625 K, bands were observed near 1580 and 1470 cm/sup /minus/1/. Isotopic labeling with oxygen-18 and deuterium shows that these bands are attributable to the asymmetric and symmetric stretching vibrations of a carbon-oxygen species similar to a carboxylate ion. This species involves about one-sixth of the total carbon in deposits on alumina. Platinum does not markedly affect the total carbon or the fraction that is carboxylate. Rhenium does not affect the total carbon but it significantly lowers the carbon-oxygen species. Pretreatment of desulfurization catalysts with ammonia reduces the total carbon by about one-half and almost eliminates carboxylate formation. Carboxylates are not found in carbon deposits on silica. 15 refs., 5 figs.
- Research Organization:
- Lehigh Univ., Bethlehem, PA (USA)
- DOE Contract Number:
- FG02-86ER13612
- OSTI ID:
- 6090543
- Report Number(s):
- CONF-890792-1; ON: DE89013310
- Resource Relation:
- Conference: Worldwide catalysis seminar: successful design of catalysts, Philadelphia, PA, USA, 5 Jul 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Infrared study of carbon on alumina
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
OXYGEN
ADSORPTION
PLATINUM
DEACTIVATION
RHENIUM
ACETYLENE
ALUMINIUM OXIDES
CARBON
CARBOXYLIC ACIDS
CATALYST SUPPORTS
CATALYSTS
ETHYLENE
INFRARED SPECTRA
SULFIDATION
ALKENES
ALKYNES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HYDROCARBONS
METALS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SORPTION
SPECTRA
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties