Effect of SMSI (strong metal-support interaction) behavior on CO adsorption and hydrogenation on Pd catalysts. I. IR spectra of absorbed CO prior to and during reaction conditions

Journal Article · Tue Sep 01 04:00:00 EDT 1981 · J. Catal.; (United States)

OSTI ID:6217121

Vannice, M A; Wang, S Y; Moon, S H

An infrared cell was designed and operated as a differential, plug-flow reactor so that ir spectra and kinetic data could be obtained simultaneously under well-defined, steady-state conditions. In agreement with results from other reactor systems, turnover frequencies varied over two orders of magnitude from the most active catalysts, TiO/sub 2/-supported Pd in the SMSI state, to the least active, Pd/SiO/sub 2/. Infrared spectra of CO adsorbed on Pd/TiO/sub 2/ and Pd/SiO/sub 2/-Al/sub 2/O/sub 3/ were recorded for the first time, and spectra for Pd/Al/sub 2/O/sub 3/ and Pd/SiO/sub 2/ were also obtained. The effects of temperature and hydrogen on the spectra were studied, and spectra were obtained under reaction conditions for five different catalysts. In the absence of H/sub 2/, a high-frequency band above 2080 cm/sup -1/ were present on all catalysts. Hydrogen had little influence on the CO spectra on the typical Pd catalysts, but it markedly reduced the CO band intensities on the Pd/TiO/sub 2/ catalysts, even at 300 K. The effect of Pd on the activity of CuO.

• Research Organization: Pennsylvania State Univ., University Park
• OSTI ID: 6217121
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 71:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

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ACTIVATION ENERGY
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
DATA
ELEMENTS
ENERGY
EXPERIMENTAL DATA
HYDROGEN
HYDROGENATION
INFORMATION
INFRARED SPECTRA
METALS
METHANATION
MINERALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
TEMPERATURE EFFECTS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS