Journal of the American Chemical Society p. 1111 - 1114 (1987)
Update date:2022-08-16
Topics:
Klabunde, Kenneth J.
Matsuhashi, Hiromi
Thermal activation of microcrystalline MgO at 400-700 deg C has been carried out under vacuum and under rapid flows of N2, Ar, O2, and H2/N2.Some samlpes of MgO were impregnated or coprecipitated with LiOH, NaOH, or Al(OH)3 before activation.The activities for 1-butene isomerization, where proton abstraction is limiting, were compared with activities for CO telomerization/reduction, where electron donation capability is most important.These studies suggest that defect sites are involved and that localized electron rich domains can be enhanced by Li+ substitution for Mg+ but that localized more electron difficient domains can be enhanced by Al3+ substitution for Mg2+.These studies also show that high-temperature thermal activation with gas flow of N2 or Ar is possible, but that O2 and H2/N2 anneal out defects and activity is lost.
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