197Au Mössbauer study of the deactivation and reactivation of a carbon-supported AuCl 4 − hydrochlorination catalyst
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Acetylene hydrochlorination catalysts consisting of activated carbon impregnated with a solution of HAuCl4·xH2O in aqua regia have been studied by197Au Mössbauer spectroscopy. The relative amounts of AuCl 4 − , of Au(0), and of an Au(J) species formed under certain process conditions were determined quantitatively. Deactivation of the catalyst at low and high temperatures was shown to be due to different mechanisms, and the reactivation of the catalyst by Cl2 gas was studied.
KeywordsSpectroscopy Thin Film Activate Carbon Process Condition Acetylene
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