Methane and methanol synthesis over supported palladium catalysts

Journal Article · Mon Feb 01 04:00:00 EST 1982 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(82)90098-7· OSTI ID:5648963

Fajula, F; Anthony, R G; Lunsford, J H

Hydrogenation of carbon monoxide has been studied between 260 and 340/sup 0/C and 5 and 50 atm of pressure over palladium supported on three different silicas and on HY and NaY zeolites. Fresh and used catalysts were characterized by chemisorption, temperature-programmed desorption, x-ray diffraction, electron microscopy, and photoelectron spectroscopy studies. The selectivity and the activity of the catalysts are strongly dependent on the nature of the support and on the state of the metal on its surface. Methanol is produced on the catalysts exhibiting small size crystallites on which CO is weakly adsorbed, whereas the formation of methane is directly related to the density of acidic sites at the surface of the support. Under the experimental conditions the palladium undergoes structural and electronic modifications due to transformations into hydride phases. These transformations lead to a cracking of the metal crystallites and to changes in the reaction rate expressions. 7 figures, 7 tables.

• Research Organization: Texas A and M Univ., College Station
• OSTI ID: 5648963
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 73:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

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10 SYNTHETIC FUELS
ALCOHOLS
ALKANES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CHEMISORPTION
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELEMENTS
HIGH TEMPERATURE
HYDROCARBONS
HYDROGENATION
HYDROXY COMPOUNDS
KINETICS
MEDIUM PRESSURE
METALS
METHANE
METHANOL
MICROSCOPY
ORGANIC COMPOUNDS
PALLADIUM
PHOTOELECTRON SPECTROSCOPY
PLATINUM METALS
REACTION KINETICS
SCATTERING
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
SYNTHESIS
TRANSFORMATIONS
TRANSITION ELEMENTS
X-RAY DIFFRACTION