Add time:07/25/2019         Source:sciencedirect.com

Deactivation mechanisms of COPPER CHROMITE (cas 11104-65-7) (CuCr2O4⋅CuO) catalyst for vapor-phase selective hydrogenation for furfuryl alcohol have been investigated using ex situ and in situ X-ray absorption fine structure (XAFS), X-ray photon spectroscopy (XPS), and Auger Electron Spectroscopy (AES). At 200 °C, the catalyst steadily deactivated. One of the dominant origins of catalyst deactivation is poisoning due to strong adsorption of polymeric species formed from the reactant and/or products. Metallic Cu is identified as the active site, while loss of active Cu(I) sites due to hydrogenation is not a deactivation cause, as opposed to previous literature reported. The copper chromite catalyst showed low activity at 300 °C process temperature. Under this condition, the Cu particle size does not change, but Cr/Cu ratio increases by 50%, suggesting that Cr coverage of Cu sites becomes an additional cause of catalyst deactivation at this temperature, along with the poisoning deactivation mechanism at 200 °C.

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