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- W3048800138 abstract "The influence of the metal selected as catalytic active phase in the two-step biomass pyrolysis-catalytic reforming strategy has been analyzed. The pyrolysis step was carried out in a conical spouted bed reactor at 500 °C, whereas steam reforming was performed in a fluidized bed reactor at 600 °C. Ni/Al2O3, Co/Al2O3 and two bimetallic Ni-Co/Al2O3 catalysts with different metal loadings were synthesized by wet impregnation method, and fresh and deactivated catalysts were characterized by N2 adsorption/desorption, X-ray Fluorescence (XRF), Temperature Programmed Reduction (TPR), X-Ray powder Diffraction (XRD), Temperature Programmed Oxidation (TPO), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). Although Ni/Al2O3 and both bimetallic catalysts had similar initial activity in terms of oxygenate conversion, (higher than 98%), the poorer metal dispersion observed in both bimetallic catalysts led to a fast decrease in conversion due to the promotion of coke formation on large particles. This occurred even though Ni–Co alloy formation has a positive influence by hindering the oxidation of Co0 species. The main cause for the deactivation of these catalysts is the formation of a coke with amorphous structure. The poor initial performance of Co/Al2O3 catalyst is related to changes in the Co0 oxidation state induced by the presence of steam, which led to a fast deactivation of this catalyst." @default.
- W3048800138 created "2020-08-18" @default.
- W3048800138 creator A5005240086 @default.
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- W3048800138 creator A5073263481 @default.
- W3048800138 creator A5079584627 @default.
- W3048800138 date "2020-11-01" @default.
- W3048800138 modified "2023-10-10" @default.
- W3048800138 title "Catalytic steam reforming of biomass fast pyrolysis volatiles over Ni–Co bimetallic catalysts" @default.
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