Carbon nanotube formation during propane decomposition on boron-modified Co/Al2O3 catalysts: A kinetic study |
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Authors: | Eva Romeo,Mark Saeys,Antonio Monzó n,Armando Borgna |
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Affiliation: | 1. Institute of Nanoscience of Aragon (INA), Department of Chemical and Environmental Engineering, University of Zaragoza, 50009 Zaragoza, Spain;2. Institute of Chemical and Engineering Sciences, 1 Pesek Road, Jurong Island, Singapore 627833, Singapore;3. Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576, Singapore |
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Abstract: | In recent years, catalytic decomposition of light hydrocarbons has been explored as an interesting alternative to produce COx-free hydrogen along with valuable carbonaceous nanomaterials. In this contribution, we report on the effect of B on the catalytic performance of Co/Al2O3 catalysts during propane decomposition. Unpromoted and B-promoted (0.5–5 wt.% B) Co catalysts were prepared by incipient wetness impregnation and thoroughly characterized using XRD, XPS, TPR, H2 chemisorption, CO-FTIR, Raman, TPO and TEM. The kinetic data were analysed using a phenomenological kinetic model. The kinetic results indicate the existence of an optimal amount of boron (ca. 2%) that maximizes both activity and stability of the catalyst. Based on the analysis of the kinetic parameters, it can be concluded that the presence of boron slows down the carburization and carbon diffusion steps, decreasing the amount of CNTs formed. However, the addition of Boron simultaneously decreases the formation of encapsulating coke, which is the cause of the catalyst deactivation. |
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Keywords: | COx-free hydrogen Propane decomposition Carbon nanotubes Co&ndash B/Al2O3 catalysts Boron promotion Kinetic modelling |
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