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  • Electronic Resource  (3)
  • CO2 hydrogenation  (2)
  • 41.80Gg  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Hydrogenation of CO2, acetone, and CO on a Rh foil promoted by titania overlayers (1990)
    Springer
    Catalysis letters 5 (1990), S. 385-394 
    Details
    ISSN: 1572-879X
    Keywords: Titania promoted rhodium ; CO2 hydrogenation ; acetone hydrogenation ; CO hydrogenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effects of submonolayer deposits of titania on the hydrogenation of CO2, acetone, and CO on a Rh foil have been investigated. Titania has been found to promote all three of the hydrogenation reactions, with each reaction exhibiting a maximum rate at a titania coverage of 0.5 ML. The maximum rate for CO2 hydrogenation is 15 times that of the bare Rh surface. Acetone hydrogenation shows a 6-fold rate enhancement, while CO displays a 3-fold increase. Changes in the selectivities for each reaction are also observed upon titania promotion. The effects of titania on these reactions are attributed to an interaction between C-O bonds and Ti3+ ions located at the perimeter of titania islands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00765181
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The kinetics of CO2 hydrogenation on a Rh foil promoted by titania overlayers (1991)
    Springer
    Catalysis letters 9 (1991), S. 415-426 
    Details
    ISSN: 1572-879X
    Keywords: CO2 hydrogenation ; TiO2 promoted rhodium ; kinetics of CO2 and CO hydrogenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Submonolayer deposits of titania on a Rh foil have been found to increase the rate of CO2 hydrogenation. The primary product, methane, exhibits a maximum rate at a TiO x coverage of 0.5 ML which is a factor of 15 higher than that over the clean Rh surface. The rate of ethane formation displays a maximum which is 70 times that over the unpromoted Rh foil; however, the selectivity for methane remains in excess of 99%. The apparent activation energy for methane formation and the dependence of the rate on H2 and CO2 partial pressure have been determined both for the bare Rh surface and the titania-promoted surface. These rate parameters show very small variations as titania is added to the Rh catalyst. The methanation of CO2 is proposed to start with the dissociation of CO2 into CO(a) and O(a), and then proceed through steps which are identical to those for the hydrogenation of CO. The increase in the rate of CO2 hydrogenation in the presence of titania is attributed to an interaction between the adsorbed CO, released by CO2 dissociation, and Ti3+ ions located at the edge of TiO x islands covering the surface. Differences in the effects of titania promotion on the methanation of CO2 and CO are discussed in terms of the mechanisms that have been proposed for these two reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764834
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The influence of substrate geometry on the emission properties of a liquid metal ion source (1986)
    Springer
    Applied physics 41 (1986), S. 335-346 
    Details
    ISSN: 1432-0630
    Keywords: 79.70+q ; 41.80Gg ; 07.80+x
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The effect of needle radius, cone angle and shaft diameter on the threshold voltage and angular intensity — total current relationships for a Ga liquid-metal ion source (LMIS) was investigated. The variation of threshold voltage with needle geometry could be described in terms of the Taylor theory of liquid cone formation by electrostatic fields. The beam energy spread was mainly a function of total source current and was not a sensitive function of emitter geometry. Source angular intensity at a constant total current increased linearly with threshold voltage when the latter was altered due to source geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616057
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    Paper (German National Licenses)
    Fulltext
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