Effect of support material on Rh catalysts

Journal Article · Thu Jul 08 04:00:00 EDT 1982 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100211a032· OSTI ID:6629525

Worley, S D; Rice, C A; Mattson, G A; Curtis, C W; Guin, J A; Tarrer, A R

The effect of support material on Rh/X catalysts has been studied by using CO as a probe molecule for chemisorption and ir spectroscopy as the analytical method. Support materials including TiO/sub 2/, Al/sub 2/O/sub 3/, SiO/sub 2/, kaolinite, and montmoroillonite have been compared as to their tendencies to produce the various CO/RH/X species generally attributed to this catalytic system. The TiO/sub 2/ and SiO/sub 2/ supports enable the most facile reduction of a rhodium precursor material to rhodium metal. Although all of the Rh/X catalysts contain some Rh(I) sites, alumina-supported ones contain the most nonmetallic rhodium. Kaolinite and montmorillonite may contain impurities which tend to poison the Rh sites for CO chemisorption. The CO/Rh/SiO/sub 2/ infrared bands are much less intense than for alumina- or titania-supported rhodium. This is probably due to weak metal/support interaction for Rh/SiO/sub 2/ because the silica employed was of high purity. 3 figures.

• Research Organization: Auburn Univ., AL
• OSTI ID: 6629525
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:14; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CLAYS
COMPARATIVE EVALUATIONS
DATA
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KAOLIN
MATERIALS
MEDIUM TEMPERATURE
METALS
MINERALS
MONTMORILLONITE
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
RHODIUM
SAMPLE PREPARATION
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS