Effects of Cs promotion on Rh/Al/sub 2/O/sub 3/ catalysts

Journal Article · Wed Oct 01 04:00:00 EDT 1986 · J. Catal.; (United States)

OSTI ID:5522379

Blackmond, D G; Williams, J A; Kesraoui, S; Blazewick, D S

The adsorptive and reactive properties of a series of Rh/Al/sub 2/O/sub 3/ catalysts promoted with various levels of Cs were investigated by IR spectroscopy of CO adsorption, temperature-programmed desorption of H/sub 2/, and CO hydrogenation reactions. The results indicate that a significant fraction of the added Cs interacts directly with the support rather than with the Rh crystallites. The degree of interaction between the alkali species and both metal and support sites on the catalyst depends strongly on the method of preparation of the catalyst, which may affect the chemical state of the alkali species. Trends for CO hydrogenation reaction activity and product selectivity were consistent with those reported for promoted Rh on other supports except that the level of promotion required to achieve similar results is much higher for Rh supported on Al/sub 2/O/sub 3/. These investigations demonstrate how a combination of experimental techniques may provide significantly more information about the effects of alkali promotion than would any of the methods used alone.

• Research Organization: Univ. of Pittsburgh, PA
• OSTI ID: 5522379
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 101:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKALI METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CESIUM
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMICAL STATE
DESORPTION
ELEMENTS
FISCHER-TROPSCH SYNTHESIS
HYDROGEN
INFRARED SPECTRA
METALS
METHANATION
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PROMOTERS
RHODIUM
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENTS