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Research Article

Effect of lattice oxygen in nickel-based catalysts with different support on coke resistance of filamentous coke in CO2 reforming of tar

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Received 22 Nov 2021, Accepted 02 Feb 2022, Published online: 22 Feb 2022
 

ABSTRACT

For CO2 reforming of tar, deactivation of catalysts caused by filamentous coke deposition limits its application in solid waste treatment. The filamentous coke removal can be aided by the lattice oxygen of active mental sites, however, there is no information on the influence of lattice oxygen in catalyst support on filamentous coke oxidation. To investigate the activity and resistance to coke deposition of different catalysts, based on a comparison of the performance of Ni/ZrO2, Ni/SiO2, Ni/MgO, and Ni/attapulgite catalysts, the influence of lattice oxygen on filamentary coke deposition is investigated in this study. In CO2 catalytic reforming experiments, the Ni/ZrO2 catalysts showed higher coke conversions (10%–23%) than the Ni/SiO2, Ni/MgO, and Ni/attapulgite catalysts. In the meantime, the lattice oxygen coverage of the Ni/ZrO2 superficies reaches 55.59%, giving Ni/ZrO2 a better resistance to filamentary coking. The high lattice oxygen coverage also improves the oxidation of the coke superficies by lattice oxygen. However, there was still 31.66% filamentary coke aggregation on the Ni/ZrO2 catalyst superficies. In conclusion, inhibiting the formation of filamentous coke and promoting the oxidation of filamentous coke are key to improving the efficiency of CO2 reforming of anaerobic tar. The results of the research can be used as a reference for the improvement of catalysts.

Acknowledgments

This work was financially supported by the Key Technologies Research and Development Program of China (2018YFC1901200).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplementary material

Supplemental data for this article can be accessed on the publisher’s website

Additional information

Funding

This work was supported by the National Key R&D System of China (2018YFC1901200).

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