Support effects studied on model supported catalysts

Technical Report · Fri Nov 01 04:00:00 EST 1991

DOI:https://doi.org/10.2172/5576394· OSTI ID:5576394

Gorte, R G

We are studying model catalysts in which the active phase is deposited onto flat oxide substrates in order to understand how a catalyst is affected by its support. We have examined the following growth and stability of titania overlayers which had been vapor deposited onto a Rh foil; the growth of Pt films on ZnO(0001)Zn and O(0001)O and compared the results to those obtained for Pt on {alpha}-Al{sub 2}O{sub 3}(0001). Samples were prepared by vapor deposition of Pt onto flat substrates in ultra high vacuum, and metal coverages were measured using a quartz-crystal, film thickness monitor; the structure and CO adsorption properties of Pt films vapor deposited onto a ZrO{sub 2}(100) crystal; the deposition of Rh on a ZrO{sub 2}(100) crystal; The absorption of NO on Pt particles supported on CeO{sub 2}, {alpha}-Al{sub 2}O{sub 3}(0001), and the Zn- and O-polar surfaces of ZnO(0001). We have investigated supported oxides in order to understand the acidic properties that have been reported for monolayer oxides. Our first studies were of amorphous, silicalumina catalysts. Finally, we have also begun to prepare model supported oxides in order to be able to used spectroscopic methods to characterize the sites formed on these materials. Our first studies were of niobia deposition on oxidized Al films and on an {alpha}-Al{sub 2}O{sub 3}(0001) crystal.

• Research Organization: Pennsylvania Univ., Philadelphia, PA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-85ER13350
• OSTI ID: 5576394
• Report Number(s): DOE/ER/13350-8; ON: DE92011604
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMISTRY
CRYSTAL GROWTH
CRYSTAL STRUCTURE
DEPOSITION
DESORPTION
DOCUMENT TYPES
ELEMENTS
FILMS
HEAT TREATMENTS
METALS
MICROSTRUCTURE
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
PROGRESS REPORT
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
RHODIUM
SORPTION
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZINC COMPOUNDS
ZINC OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES