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- W2028208249 abstract "The activation of CeCu2 and NdCu intermetallic precursors to yield highly active methanol synthesis catalysts has been investigated using microreactor techniques under pressures of 10/2-15 bar. Activation procedures using synthesis gas alone and using hydrogen pretreatment with subsequent oxidation in either syngas or N2O are evaluated and compared. Reactive frontal chromatography was employed to perform in situ measurements of the specific copper surface area: values for active catalysts are typically less than 0.5 m2/g and do not correlate with the synthesis activity. The thermal stability and resistance to poisoning of these materials was also studied. They exhibit irreversible deactivation at temperatures greater than 523 K and the activity of oxidized catalysts cannot be fully regenerated on rereduction. Exposure of the active catalysts to CO2 leads to complete loss of synthesis activity at 473 K and results in the formation of a strongly bound CO2 complex. This CO2 cannot be fully desorbed below the thermal sintering temperatures of the catalysts. These data and earlier results are rationalized on the basis of an active site for methanol synthesis which involves Cu entities intimately associated with the rare-earth-oxide phase that is generated during activation." @default.
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- W2028208249 date "1989-07-01" @default.
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- W2028208249 title "High-activity methanol synthesis catalysts derived from rare-earth/copper precursors: Genesis and deactivation of the catalytic system" @default.
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- W2028208249 doi "https://doi.org/10.1016/0021-9517(89)90309-6" @default.
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