Chemisorption of CO, NO, and H/sub 2/ on transition metal-titania thin film model catalysts
Journal Article
·
· J. Catal.; (United States)
OSTI ID:5648238
Chemisorption on thin film models of Rh/TiO/sub 2/ and Pt/TiO/sub 2/ catalysts before and after encapsulation with TiO/sub x/ (1.0 less than or equal to x less than or equal to 1.2) is reported. TiO/sub x/ blocks adsorption sites and induces new desorption states. A CO desorption peak, assigned to CO on Rh atoms perturbed by TiO/sub x/, is observed at 325 K after adsorption at 120 K on a TiO/sub x/-covered Rh/TiO/sub 2/ surface. CO adsorbed at 285 K onto the encapsulated Rh/TiO/sub 2/ surfaces shows a new 685 K CO desorption state attributed to an activated form of CO with a weakened C-O bond. NO desorbs from clean Rh overlayers with a profile most like Rh(110). On encapsulated Rh surfaces N/sub 2/O is the major desorption product. Compared to bulk Pt, desorption experiments show suppressed H/sub 2/ adsorption capacity for thin (< 2 ML) Pt layers in contact with, but not encapsulated by, TiO/sub x/. For thin layers of Pt on fully oxidized TiO/sub 2/ layers there is no reduction of H/sub 2/ chemisorption. The results suggest bonding between Ti and Pt which affects H/sub 2/ chemisorption even though no Pt surface sites are blocked.
- Research Organization:
- Univ. of Texas, Austin
- OSTI ID:
- 5648238
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 102:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Reaction and chemisorption of small molecules on clean and chemically modified transition metal surfaces
Effect of Platinum Nanocluster Size and Titania Surface Structure upon CO Surface Chemistry on Platinum-Supported TiO2 (110)
Synchrotron radiation photoemission studies of CO chemisorption on Pt/Ta(110) and Ni/Ta(110)
Thesis/Dissertation
·
Wed Dec 31 23:00:00 EST 1986
·
OSTI ID:5922464
Effect of Platinum Nanocluster Size and Titania Surface Structure upon CO Surface Chemistry on Platinum-Supported TiO2 (110)
Journal Article
·
Wed Mar 28 23:00:00 EST 2001
· Journal of Physical Chemistry B
·
OSTI ID:1033471
Synchrotron radiation photoemission studies of CO chemisorption on Pt/Ta(110) and Ni/Ta(110)
Conference
·
Tue Dec 31 23:00:00 EST 1985
·
OSTI ID:7009075
Related Subjects
01 COAL, LIGNITE, AND PEAT
010408 -- Coal
Lignite
& Peat-- C1 Processes-- (1987-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL REACTIONS
CHEMISORPTION
DESORPTION
ELEMENTS
FILMS
HYDROGEN
HYDROGENATION
METALS
METHANATION
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
RHODIUM
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
010408 -- Coal
Lignite
& Peat-- C1 Processes-- (1987-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL REACTIONS
CHEMISORPTION
DESORPTION
ELEMENTS
FILMS
HYDROGEN
HYDROGENATION
METALS
METHANATION
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
RHODIUM
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS