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Highly Active and Stable Ni-Cu Supported Catalysts prepared by Combustion Synthesis for Hydrogen Production from Ethanol
journal contribution
posted on 2019-08-07, 00:00 authored by Alexander MukasyanAlexander Mukasyan, E.E.Wolf, J.T. Miller, V. DanghyanWe report on the high activity and stability towards deactivation during ethanol decomposition of mono (Ni, Cu) and bimetallic Ni-Cu catalysts supported on ceria and silica that were prepared by impregnated support solution combustion synthesis (ISCS). Ni supported on ceria, behaves much like bulk Ni, as it deactivates within a few hours of time on stream (TOS). Addition of Cu improves the stability of ceria supported Ni-Cu bimetallic catalysts but it still deactivates during 10 h of TOS. Ni prepared by dry impregnation on silica deactivates completely during a few h of TOS. Ni supported on silica prepared by ISCS, show a remarkable high stability for over 30 h TOS and Ni-Cu is stable over 100 h of TOS operating at 100% conversion. XRD, XPS, HRTEM, in-situ XAS and textural characterization of these catalysts show that the surface Ni concentration is small on silica-supported catalysts due to partial encapsulation of Ni by the silica support, which protects the metal particles from carbon formation, thus hindering deactivation. Addition of Cu to silica in- creases the number of active sites, but also decreases CO chemisorption on Ni indicating the formation of a Cu-Ni alloy, which had been reported to inhibit carbon formation on Ni. The combined effect of encapsulation and formation of Ni-Cu surface alloys result in the remarkable stability of the Cu-Ni silica supported catalyst.
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2019-08-22Language
- English
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