Surface spectroscopic studies of a model silica-supported copper catalyst: Adsorption and reactions of CO, H[sub 2]O, and NO

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)

DOI:https://doi.org/10.1116/1.578525· OSTI ID:6299285

Xu, X; Vesecky, S M; He, J; Goodman, D W ^[1]

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1. Department of Chemistry, Texas A M University, College Station, Texas 77843-3255 (United States)

A model silica-supported copper catalyst has been studied with temperature programmed desorption, x-ray photoelectron spectroscopy, infrared reflection--absorption spectroscopy, and scanning tunneling microscopy. The reactions of water and nitric oxide on the Cu/SiO[sub 2] catalyst were also investigated. The model catalyst was prepared by evaporating copper onto a silica thin film ([similar to]100 A) which was, in turn, supported on a Mo(110) surface. Copper forms small metallic clusters on the silica surface with a small fraction being partially oxidized. Water dissociates on the Cu/SiO[sub 2] catalyst to yield dihydrogen at 400 K and surface oxygen during temperature programmed reaction. Nitric oxide reacts with the model silica-supported copper catalyst to produce nitrous oxide and surface oxygen, which does not desorb until copper evaporates at high temperatures.

• OSTI ID: 6299285
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States), Vol. 11:4; ISSN 0734-2101
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON MONOXIDE
ADSORPTION
COPPER
CATALYTIC EFFECTS
NITRIC OXIDE
WATER
DISSOCIATION
SILICA
ULTRAHIGH VACUUM
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
HYDROGEN COMPOUNDS
METALS
MINERALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties