Boosting syngas production from corncob tar reforming over Ni/MgAl hydrotalcite-derived catalysts
With the tailored morphology and other properties, Ni/MgAl-10 catalysts exhibited excellent activity for syngas production from the reforming of corncob tar and toluene. [Display omitted] •The morphology of Mg-Al hydrotalcite can be tailored under different conditions.•Ni/MgAl catalysts with differe...
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Veröffentlicht in: | Fuel (Guildford) 2022-01, Vol.307, p.121779, Article 121779 |
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Sprache: | eng |
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Zusammenfassung: | With the tailored morphology and other properties, Ni/MgAl-10 catalysts exhibited excellent activity for syngas production from the reforming of corncob tar and toluene.
[Display omitted]
•The morphology of Mg-Al hydrotalcite can be tailored under different conditions.•Ni/MgAl catalysts with different morphologies are active for tar reforming.•The basicity of the catalyst affects the gas composition in reforming of corncob tar.•Ni/MgAl-10 with the lowest activation energy is stable during long-term reforming.
In this work, various Mg-Al hydrotalcites with tailored morphologies were prepared by the co-precipitation method and then supported Ni using incipient impregnation for corncob tar reforming. Mg-Al hydrotalcites prepared under a pH of 10 and subsequently supported 20 wt% Ni (Ni/MgAl-10) exhibited excellent activity in syngas production (26.3 mmol/g) from corncob tar reforming at 600 °C. For a better understanding of the activity of the obtained catalysts, their activities for steam reforming of toluene (SRT) were investigated. In comparison with commercial Ni/Al2O3 and other Ni/MgAl hydrotalcite-derived catalysts, Ni/MgAl-10 had higher stability in SRT at 550 °C, which maintained >90% of toluene conversion during 10 h time-on-stream. The characterizations indicated that the excellent performance of Ni/MgAl-10 in both biomass tar and toluene reforming can be attributed to high dispersion of Ni particles, large specific surface area (119.9 m2/g), high reducibility (96%), and high basicity (1.33 mmol/gcat). Moreover, the kinetic study confirmed that Ni/MgAl-10 with a lower activation energy (23.5 kJ/mol) than commercial Ni/Al2O3 could exhibit better performance in SRT at low temperatures. The results could provide a design of a novel Ni-based catalyst and its application for tar reforming in the process of biomass gasification. |
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ISSN: | 0016-2361 1873-7153 |
DOI: | 10.1016/j.fuel.2021.121779 |