Structure sensitivity in methanol decomposition on ZnO single-crystal surfaces

Journal Article · Mon Aug 01 04:00:00 EDT 1983 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(83)90200-2· OSTI ID:5571554

Cheng, W H; Akhter, S; Kung, H H

Decomposition of methanol-d/sub 4/ was studied using temperature-programmed decomposition spectroscopy on the nonpolar flat (1010), stepped (5051) and (4041), and the polar (0001) ZnO surfaces. The (5051)and (4041) planes are surfaces with (0001) steps and (1010) terraces. CD/sub 4/, CO, CO/sub 2/, and D/sub 2/ were the decomposition products on the nonpolar stepped and flat surfaces. The ratios of these products were similar on these surfaces. The fraction of desorbed product being decomposition products increased in the order stoichiometric (1010) < reduced (1010) < (5051) < (4041). The activity of the stepped surfaces decreased slightly after oxygen pretreatment of the surface. The results indicated that steps and anion vacancy defects are the active sites for methanol decomposition. The activity of the polar (0001) surface was similar to that of the stepped surfaces. However, the products were different. CD/sub 2/O and D/sub 2/O, but no CD/sub 4/ were observed in addition to CO, CO/sub 2/ and D/sub 2/. The results indicated that methanol decomposition on ZnO is a structure-sensitive reaction. Implication of these observations on the reverse reaction of methanol synthesis on ZnO and Cu-Zn oxide is discussed. 4 figures, 4 tables.

• Research Organization: Northwestern Univ., Evanston, IL
• OSTI ID: 5571554
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 82:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

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ALCOHOLS
ALKANES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CRYSTALS
DATA
DECOMPOSITION
DESORPTION
DEUTERIUM
DEUTERIUM COMPOUNDS
ELEMENTS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HIGH VACUUM
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
HYDROXY COMPOUNDS
INFORMATION
ISOTOPE EFFECTS
ISOTOPES
ISOTOPIC EXCHANGE
LABELLING
LIGHT NUCLEI
METHANE
METHANOL
MONITORING
MONOCRYSTALS
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PRESSURE DEPENDENCE
PYROLYSIS
STABLE ISOTOPES
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE MONITORING
THERMOCHEMICAL PROCESSES
YIELDS
ZINC COMPOUNDS
ZINC OXIDES