Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 91, Issue -, Pages 167-181Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2020.07.050
Keywords
Hydrogen; Pyrolysis; Reforming; Biomass; Bimetallic catalysts; Cobalt
Funding
- Spain's ministry of Economy and Competitiveness (AEI/FEDER, UE) [CTQ2016-75535-R]
- Spain's ministry of Science, Innovation and Universities (MCIU/AEI/FEDER, UE) [RTI2018-101678-B-I00]
- Spain's ministry of Science and Innovation [PID2019-107357RB-I00]
- European Union [823745]
- Basque Government [IT1218-19, KK-2020/00107]
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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 degrees C, whereas steam reforming was performed in a fluidized bed reactor at 600 degrees 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 N-2 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 Co-0 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 Co-0 oxidation state induced by the presence of steam, which led to a fast deactivation of this catalyst. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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