Support effects studied on model supported catalysts. Progress report, April 1, 1991--March 31, 1992

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

DOI:https://doi.org/10.2172/10135476· OSTI ID:10135476

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: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-85ER13350
• OSTI ID: 10135476
• Report Number(s): DOE/ER/13350-8; ON: DE92011604
• Resource Relation: Other Information: PBD: Nov 1991
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
TITANIUM OXIDES
CRYSTAL GROWTH
PLATINUM
CARBON MONOXIDE
ADSORPTION
RHODIUM
NITROGEN OXIDES
NIOBIUM OXIDES
PROGRESS REPORT
CATALYST SUPPORTS
ZINC OXIDES
ZIRCONIUM OXIDES
HEAT TREATMENTS
FILMS
DESORPTION
CERIUM OXIDES
ALUMINIUM OXIDES
DEPOSITION
MICROSTRUCTURE
CHEMISTRY
360102
360202
400201
STRUCTURE AND PHASE STUDIES
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES