Abstract
AbstractThe adsorption of ethylene glycol on γ‐alumina as well as on an alumina‐supported copper catalyst has been studied under working conditions using transient FTIR experiments. Time‐dependent spectra were recorded after exposure of the substrates to a pulse of ethylene glycol, or to subsequent stepwise increases in the ethylene glycol concentration. On alumina both dehydration and dehydrogenation products were observed; on supported copper dehydration was suppressed and only the aldehyde formed by dehydrogenation of the reactant glycol was observed. Hydrogen was found to prevent the formation of dialdehydic species (surface bound glyoxal) which were observed in nitrogen carrier gas. The relevance of these results to the mechanism of the copper‐catalyzed amination of alcohols is discussed.
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