Elsevier

Catalysis Today

Volume 357, 1 November 2020, Pages 583-589
Catalysis Today

Review
Flexible syngas production using a La2Zr2-xNixO7-δ pyrochlore-double perovskite catalyst: Towards a direct route for gas phase CO2 recycling

https://doi.org/10.1016/j.cattod.2019.05.039Get rights and content
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Highlights

  • Customised H2-rich syngas production from CO2/CH4 mixtures.

  • Ni stabilised on complex inorganic mixed oxides as versatile catalysts for reforming reactions.

  • Effect of water, temperature and space velocity on H2/CO ratio.

  • Overcoming coke deposition and sintering by introducing Ni in a pyrochlore-perovskite structure.

Abstract

The bi-reforming of methane (BRM) has the advantage of utilising greenhouse gases and producing H2 rich syngas. In this work Ni stabilised in a pyrochlore-double perovskite structure is reported as a viable catalyst for both Dry Reforming of Methane (DRM) and BRM. A 10 wt.% Ni-doped La2Zr2O7 pyrochlore catalyst was synthesised, characterised and tested under both reaction conditions and its performance was compared to a supported Ni/La2Zr2O7. In particular the effect of steam addition is investigated revealing that steam increases the H2 content in the syngas but limits reactants conversions. The effect of temperature, space velocity and time on stream was studied under BRM conditions and brought out the performance of the material in terms of activity and stability. No deactivation was observed, in fact the addition of steam helped to mitigate carbon deposition. Small and well dispersed Ni clusters, possibly resulting from the progressive exsolution of Ni from the mixed oxide structure could explain the enhanced performance of the catalyst.

Keywords

Pyrochlore
Bi-reforming of methane
Dry reforming of methane
Ni catalyst

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