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  • 1
    Electronic Resource
    Electronic Resource
    Combined elevated pressure reactor and ultrahigh vacuum surface analysis system (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2350-2352 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A combined elevated pressure reactor/ultrahigh vacuum (UHV) surface analytical system has been designed for studies of heterogeneous catalytic reactions. The reaction cell is separated from the surface analysis chamber by a differentially pumped sliding seal. This feature allows simple in situ sample transfer capabilities from the surface analysis region to the reactor cell and also facilitates the introduction and repair of the sample and/or holder with no significant perturbation of the UHV analysis chamber vacuum. The pumping arrangements provide for rapid evacuation of the reaction cell as well as maximum sensitivity with respect to the detection of reaction products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143933
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  • 2
    Electronic Resource
    Electronic Resource
    CO Oxidation on Palladium. 1. A Combined Kinetic-Infrared Reflection Absorption Spectroscopic Study of Pd(100) (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 2972-2977 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100062a038
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  • 3
    Electronic Resource
    Electronic Resource
    CO Oxidation on Palladium. 2. A Combined Kinetic-Infrared Reflection Absorption Spectroscopic Study of Pd(111) (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 2978-2981 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100062a039
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  • 4
    Electronic Resource
    Electronic Resource
    Di- and Trimerization of Acetylene over a Model Sn/Pt Catalyst (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 1034-1042 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00108a020
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  • 5
    Electronic Resource
    Electronic Resource
    Methanol synthesis on a Cu(100) catalyst (1991)
    Springer
    Catalysis letters 10 (1991), S. 383-390 
    Details
    ISSN: 1572-879X
    Keywords: Methanol synthesis ; catalysis ; Cu(100)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The synthesis of methanol on a Cu(100) single crystal surface was studied between 500–550 K and at pressures between 44–102 kPa using a gas mixture of CO2/CO/H2 = 1/2/12. The specific reaction rates found for methanol synthesis were approximately an order of magnitude lower than those rates previously reported for silica supported, Cu-based catalysts. Furthermore the rates observed for the Cu(100) catalyst are estimated to be several orders of magnitude smaller than those rates found for ZnO supported Cu catalysts at comparable reaction conditions. The very low concentration of ionic copper species on the surface is thought to be responsible for the low activity of the Cu(100) catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769173
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  • 6
    Electronic Resource
    Electronic Resource
    Pretreatment effects on the active site for methane activation in the oxidative coupling of methane over MgO and Li/MgO (1995)
    Springer
    Catalysis letters 35 (1995), S. 23-32 
    Details
    ISSN: 1572-879X
    Keywords: oxidative methane coupling ; methane activation ; MgO ; Li/MgO
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effects of high temperature pretreatments on the activity of MgO and Li/MgO catalysts for the oxidative coupling of methane have been studied. The MgO powder catalyst exhibited a turnover frequency of 3.0×10−3 molecules/sites, at 990K, whereas the Li/MgO catalyst showed a turnover frequency of 7.0×10−2 molecules/sites, under the same reaction conditions. The initial C2 formation rate was observed to increase with pretreatment temperature over the MgO catalyst, supporting our previous proposal that F-type defects are responsible for methane activation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807000
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  • 7
    Electronic Resource
    Electronic Resource
    CO oxidation on a Cu(100) catalyst (1993)
    Springer
    Catalysis letters 21 (1993), S. 165-174 
    Details
    ISSN: 1572-879X
    Keywords: CO oxidation ; Cu(100)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The oxidation of carbon monoxide by molecular oxygen on a single crystal Cu(100) catalyst was studied at 458 K using reactant gas mixtures with CO/O2 ratios of 2/1, 10/1 and 25/1 at a total pressure of 10 Torr. The catalytic activities were found to be strongly dependent upon the CO/O2 ratio. Under stoichiometric reaction conditions (CO/O2 = 2), the initial CO oxidation activity decreased sharply; with a highly reducing reaction mixture (CO/O2 = 25), the initial activity gradually increased. These changes in catalytic activities with reactant gas mixture composition correlate with changes in surface composition, namely an increase in the surface oxygen coverage. Post-reaction TPD revealed the presence of a carbonate-like species which decomposed at ca. 630 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00767382
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  • 8
    Electronic Resource
    Electronic Resource
    CO oxidation on a model Cu/Rh(100) catalyst (1992)
    Springer
    Catalysis letters 14 (1992), S. 27-35 
    Details
    ISSN: 1572-879X
    Keywords: CO oxidation ; bimetallic catalysis ; Cu/Rh(100)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction between carbon monoxide and molecular oxygen on a model Cu/Rh(100) bimetallic catalyst was studied at 455 K using a CO/O2 = 2 reactant gas mixture at a total pressure of 10.0 Torr. A maximum in the initial activity was observed at a Cu coverage of 1.3 monolayers. However, the Cu overlayers were found to be unstable at the reaction conditions employed in that the Cu films interact strongly with surface oxygen to form three-dimensional CuOx clusters. The morphological modifications were found to influence markedly the catalytic properties of the surface. However, the initial catalytic activity and surface morphology of the Cu films could be restored by flashing the sample to 〉 750 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764215
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  • 9
    Electronic Resource
    Electronic Resource
    Methane activation on clean and oxidized Ni(100) (1993)
    Springer
    Catalysis letters 17 (1993), S. 39-46 
    Details
    ISSN: 1572-879X
    Keywords: Methane activation ; thin film nickel oxide ; Ni(100)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The activation of methane was investigated on a clean and oxidized Ni(100) surface in the pressure range of 0.05–1.0 Torr. The results are most consistent with a precursor mediated mechanism being primarily responsible for the reactive sticking of methane on the clean Ni(100) surface. This contrasts with the Ni(111) surface where dissociative adsorption has been determined to occur predominantly through the direct mechanism. The reaction probability of methane on the NiO films was significantly lower than that observed for the clean Ni(100) surface and exhibited an apparent activation energy of 8.8±1.1 kcal/mol. The results suggest that methane activation on NiO occurs on defect metallic nickel sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00763925
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  • 10
    Electronic Resource
    Electronic Resource
    Ethylene dimerization over a model Sn/Pt(111) catalyst (1994)
    Springer
    Catalysis letters 29 (1994), S. 133-143 
    Details
    ISSN: 1572-879X
    Keywords: ethylene ; dimerization ; Pt(111) ; Sn/Pt(111) ; UHV
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The dimerization reaction of ethylene was studied over Pt(111) and (√3×√3)R30°-Sn/ Pt(111) model catalysts at moderate pressures (20–100 Torr). The catalyst surfaces were prepared and characterized in a UHV surface analysis system and moderate pressure catalytic reactions were conducted with an attached batch reactor. The overall catalytic activity of the (√3×√3)R30°-Sn/Pt(111) surface alloy for C4 products was slightly higher than that at Pt(111). In addition to the dimerization reaction, hydrogenolysis of ethylene to propane and methane was also observed, with the (√3×√3)R30°-Sn/Pt(111) surface alloy less active than Pt(111). Among the C4 products, butenes andn-butane were the major components. Carbon buildup was observed to be significant above 500 K with the (√3×√3)R30°-Sn/Pt(111) surface alloy much more resistant than Pt(111). The dimerization of ethylene was not eliminated by the presence of surface carbonaceous deposits and even at significant surface coverages of carbon the model catalysts exhibited significant activities. The results are discussed in terms of the surface chemistry of ethylene and the previously reported catalytic reactions of acetylene trimerization andn-butane hydrogenolysis at these surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00814260
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