Activity of Pd(110) for methanol synthesis

Journal Article · Tue Dec 01 04:00:00 EST 1987 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(87)90185-0· OSTI ID:5206247

Berlowitz, P J; Goodman, D W

The synthesis of methanol from CO and H/sub 2/ has been studied over unsupported, single-crystal Pd(110) at pressures of 72.3-244 KPa, temperatures of 493-553 K, and a H/sub 2//CO ratio of 3.9, in a combined high-pressure reactor/UHV surface analysis chamber. At 244 KPa the reaction exhibited linear Arrhenius behavior with an activation energy of 18.4 +/- 1.9 kcal/mol, and a pre-exponential factor of 8 x 10/sup 4/ s/sup -1/. These values are in good agreement with values reported for supported Pd/SiO/sub 2/. At 553 K the reaction was roughly first order in total pressure (1.2 +/- 0.2) over the pressure range studied. Specific rates (turnover frequencies) observed in this study, extrapolated to pressures typical of most methanol synthesis work (1-1.5 MPa), are in good agreement with rates observed for Pd dispersed on noninteracting supports such as SiO/sub 2/, and some basic supports such as ZnO and MgO. These rates are higher than those observed over Pd supported on zeolite and acidic supports (e.g., PdNaY and Al/sub 2/O/sub 3/), but much lower than those observed on highly active La/sub 2/O/sub 3/-supported Pd. In addition, no dimethyl ether product was detected on Pd(110), though it is a significant product on many acidic supports. Thus, Pd metal is an active methanol synthesis catalyst, and no specific support interaction is required. Highly interacting supports exhibit rates and/or selectivities substantially different from those of Pd(110).

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5206247
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 108:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

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10 SYNTHETIC FUELS
ACTIVATION ENERGY
ALCOHOLS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
ELEMENTS
ENERGY
ETHERS
HYDROXY COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
METALS
METHANATION
METHANOL
MINERALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
RARE EARTH COMPOUNDS
REACTION KINETICS
SILICON COMPOUNDS
SILICON OXIDES
SYNTHESIS
TRANSITION ELEMENTS
ZEOLITES
ZINC COMPOUNDS
ZINC OXIDES