Studies of the interactions of H/sub 2/ and CO with Pd/SiO/sub 2/ promoted with La/sub 2/O/sub 3/, CeO/sub 2/, Pr/sub 6/O/sub 11/, Nd/sub 2/O/sub 3/, and Sm/sub 2/O/sub 3/
The interactions of H/sub 2/ and CO with Pd/SiO/sub 2/ promoted with La/sub 2/O/sub 3/, CeO/sub 2/, Pr/sub 6/O/sub 11/, Nd/sub 2/O/sub 3/, and Sm/sub 2/O/sub 3/ have been investigated using temperature-programmed desorption and temperature-programmed surface reaction. Introduction of the promoter following the preparation of the Pd/SiO/sub 2/ catalyst results in a partial coverage of the Pd particles by the oxide promoter. Upon reduction of the promoted catalysts, portions of the promoter in contact with Pd undergo reduction. The partially reduced rare earth oxide species covering the Pd particles reduce the amounts of H/sub 2/ and CO that can be adsorbed on the metal. The rare earth oxide moieties have a slight influence on the distribution of H/sub 2/ adstates but cause a significant change in the distribution of CO adstates. Decoration of Pd by rare earth oxide moieties also aids the dissociation of CO, and raises thereby the activity for CH/sub 4/ synthesis relative to that for Pd/SiO/sub 2/. The promoter also serves to increase the activity for CH/sub 3/OH synthesis and the formation of CO/sub 2/ via the water-gas shift reaction. 42 references.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5270821
- Journal Information:
- J. Catal.; (United States), Vol. 99:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Studies of the interactions of H/sub 2/ and CO with Pd/SiO/sub 2/ promoted with Li, Na, K, Rb, and Cs
Studies of the interactions of H/sub 2/ and CO with Pd/TiO/sub 2/ and TiO/sub 2/-promoted Pd/SiO/sub 2/
Related Subjects
10 SYNTHETIC FUELS
CARBON MONOXIDE
METHANATION
CERIUM OXIDES
CATALYTIC EFFECTS
FISCHER-TROPSCH SYNTHESIS
CATALYSIS
LANTHANUM OXIDES
NEODYMIUM OXIDES
PALLADIUM
PRASEODYMIUM OXIDES
SAMARIUM OXIDES
CARBON DIOXIDE
CATALYST SUPPORTS
CHEMISORPTION
DESORPTION
DISSOCIATION
HYDROGEN
METHANOL
PROMOTERS
REDUCTION
SILICA
ALCOHOLS
CARBON COMPOUNDS
CARBON OXIDES
CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HYDROXY COMPOUNDS
LANTHANUM COMPOUNDS
METALS
MINERALS
NEODYMIUM COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
TRANSITION ELEMENTS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)
090221 - Alcohol Fuels- Chemical Synthesis- (1976-1989)