Crystallite size and support effects on CO hydrogenation reactions. Final progress report, January 1, 1982-August 30, 1984

Technical Report · Wed Feb 01 04:00:00 EST 1984

OSTI ID:6952284

Vannice, M A

TiO/sub 2/-supported Pd was found to be the most active Pd methanation catalyst yet reported. However, in-situ IR studies showed that almost no IR-active CO was present on the Pd surface during reaction. During this time, similar results were found for Pt, as Pt/TiO/sub 2/ catalysts were found to be 100 times more active than Pt/SiO/sub 2/ catalysts and 10 times more active than Pt/Al/sub 2/O/sub 3/ and Pt/SiO/sub 2/-Al/sub 2/O/sub 3/ catalysts. Again surface concentrations of IR-active CO were barely detectable under reaction conditions. Both H/sub 2/ and CO chemisorption measurements were conducted on these catalysts. The surface concentrations of CO under reaction conditions indicated that only a small fraction (1-2%) of the TiO/sub 2/-supported metal surface was covered by CO. As a consequence, a modified model for the methanation reaction was proposed, and it was inferred from the studies on Pt and Pd that only a small fraction of the surface metal atoms constitute active sites which create these higher activities.

• Research Organization: Pennsylvania State Univ., University Park (USA). Dept. of Chemical Engineering
• DOE Contract Number: AC02-77ER04463
• OSTI ID: 6952284
• Report Number(s): DOE/ER/04463-7; ON: DE84012474
• Country of Publication: United States
• Language: English

Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ADSORPTION
AROMATICS
BENZENE
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HYDROCARBONS
HYDROGENATION
METALS
METHANATION
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
SORPTION
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS