Direct synthesis of methanol, dimethyl ether, and paraffins from syngas over Pd/zeolite Y catalysts

Journal Article · Sun Mar 01 04:00:00 EST 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90224-6· OSTI ID:6984942

Cavalcanti, F A.P.; Stakheev, A Yu; Sachtler, W M.H. ^[1]

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1. Northwestern Univ., Evanston, IL (United States)

CO hydrogenation has been studied over Pd/NaY and Pd/HY catalysts prepared by ion exchange, By controlling the calcination program, Pd/NaY catalysts can be tuned to selectively produce either branched C{sub 4} hydrocarbons or CH{sub 3}OH and CH{sub 3}OCH{sub 3}. On Pd/HY catalysts, C{sub 2}H{sub 6} and C{sub 3}H{sub 8} predominate. Dissociative adsorption of CO over small Pd particles leads to formation of methane and an interstitial PdC{sub 0.13} compound, detected by XRD. Reduction with H{sub 2} converts PdC{sub 0.13} to Pd and methane. During CO hydrogenation catalysis, palladium particles grow, leading to local collapse of the zeolite lattice. Pd migration is also manifest from changes in the Pd/Si ratio detected by XPS. The reaction network reveals bifunctional catalysis: formation of CH{sub 3}OH on Pd particles is followed by its conversion to CH{sub 3}OCH{sub 3} and hydrocarbons over acid sites. Readsorption of hydrocarbons on the Pd particles results in hydrogenation of unsaturated compounds and to changes in the activity, selectivity, and deactivation behavior of the catalysts.

• OSTI ID: 6984942
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 134:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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ADSORPTION
ALCOHOLS
ALKANES
CALCINATION
CARBIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
CONTROL
DEACTIVATION
DECOMPOSITION
DIFFRACTION
DISSOCIATION
ELECTRON SPECTROSCOPY
ELEMENTS
ETHANE
ETHERS
FISCHER-TROPSCH SYNTHESIS
HYDROCARBONS
HYDROGENATION
HYDROXY COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE
ION EXCHANGE MATERIALS
MATERIALS
METALS
METHANATION
METHANE
METHANOL
METHYL ETHER
MINERALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PALLADIUM CARBIDES
PALLADIUM COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PLATINUM METALS
PROPANE
PYROLYSIS
SCATTERING
SILICATE MINERALS
SORPTION
SPECTROSCOPY
SYNTHESIS
TEMPERATURE CONTROL
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
ZEOLITES