Effect of niobia on the methanation activity of a Pt foil
Recent work examining the interaction between titania and transition metals has indicated that a partially reduced titania overlayer can form on the surface of a titania-supported catalyst. In addition, the authors have shown that a Pt foil with a titania overlayer exhibits the same methanation rates as are reported for actual titania-supported Pt catalysts, even though complete suppression of CO and H/sub 2/ adsorption is observed. Unusual support effects are observed for metals on niobia as well. As with titania-supported catalysts, catalysts supported on niobia can exhibit suppressed adsorption of CO and H/sub 2/ while maintaining a high methanation activity. To determine whether an overlayer of niobia was responsible for the properties observed with niobia-supported catalysts, the authors have examined the methanation activity for a Pt foil with a niobia overlayer. The experimental apparatus consists of a sample attached to a magnetically manipulated, linear-motion feedthrough which can be isolated from an ultrahigh vacuum system. This system allows them to measure reaction rates at atmospheric pressures on a sample which can be characterized by Auger electron spectroscopy (AES) both before and after reaction. This system is described in more detail elsewhere. 22 references.
- Research Organization:
- Univ. of Pennsylvania, Philadelphia (USA)
- DOE Contract Number:
- FG02-85ER13350
- OSTI ID:
- 5330036
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 98:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Lignite
& Peat-- C1 Processes-- (1987-)
ADSORPTION
AUGER ELECTRON SPECTROSCOPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTRON SPECTROSCOPY
ELEMENTS
HYDROGEN
LAYERS
METALS
METHANATION
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
REFRACTORY METAL COMPOUNDS
SORPTION
SPECTROSCOPY
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS