Frequency response study of the effect of alkali promotion on Rh/TiO/sub 2/ catalysts: evidence for kinetically distinct H/sub 2/-sorbing sites

Journal Article · Sat Nov 01 04:00:00 EST 1986 · J. Catal.; (United States)

OSTI ID:5571837

Marcelin, G; Lester, J E; Mitchell, S F

The role of support and alkali promoter on the kinetics of hydrogen chemisorption on supported rhodium catalysts has been investigated using frequency response chemisorption (FRC). In all catalysts studied, several kinetically distinct chemisorbing sites were observed; with the exact number and kinetic parameters depending on the exact combination of promoter and support used. Comparison of the FRC spectra of Rh/SiO/sub 2/ and Rh/TiO/sub 2/ revealed the existence of new chemisorbing sites in the latter. One of the Rh/TiO/sub 2/ sites may be attributed to H/sub 2/ spillover onto the support. The addition of alkali promoters suppressed the H/sub 2/ chemisorption of specific sites.

• Research Organization: Univ. of Pittsburgh, PA
• OSTI ID: 5571837
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 102:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METALS
ALKANES
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COMPARATIVE EVALUATIONS
ELEMENTS
ETHANE
FISCHER-TROPSCH SYNTHESIS
HYDROCARBONS
HYDROGEN
HYDROGENATION
KINETICS
METALS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PROMOTERS
REACTION KINETICS
RHODIUM
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS