Effect of activated carbon on reaction performance of CFC-113 Cu-Pd catalyst for hydrochlorination
Using wood carbon AC-1 and pitch carbon AC-2 as carriers,the supported Cu-Pd dual-compo-nent catalyst was prepared.The catalyst was applied to the hydrogenation and dechlorination of trifluorotri-chloroethane(CFC-113)to prepare trifluorochloroethylene(CTFE).It was found that the two carrier cata-lysts showed high initial activity,but the AC-2 catalyst was rapidly deactivated in a short time.Chemical adsorption and XRD showed that AC-1 catalyst had higher Pd dispersion and larger Cu grain size;further XPS and TPR analysis showed that the metal reduction temperature on the surface of AC-2 catalyst was lower than that of AC-1,but the latter showed a more concentrated distribution of Cu species.The different functional groups on the surface of the support will lead to the difference in the reaction performance of the catalyst.The higher carboxyl concentration on the surface of AC-2 is conducive to the adsorption and dispersion of Cu,but Cu is prone to change in species and valence due to the action of HCl in the reaction process.The stability of wooden carbon catalyst is better than that of asphalt carbon,which may be related to the relatively single and concentrated distribution of Cu species on the surface.
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