Ni-exsolved catalysts from hard templated mesoporous LaNiO3 perovskite for highly efficient NH3 decomposition
(2025) Chemical Engineering Journal — Vol. 506, p. 160377 (2025)
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- Authors
Schnee, Josefine 
- Abstract
- LaNiO3 perovskites have been recently studied for H2 production from NH3 decomposition / cracking. So far, this material has had its catalytic performance boosted along the addition of basic doping agents. Nevertheless, little attention has been paid to the potential benefit to gain from its textural properties. In this work, high specific surface area LaNiO3 were prepared through the yet never explored combination of citric acid as complexing agent, SBA-15 as sacrificial hard template (to create mesopores), and exsolution (to expose and activate Ni). After removal of the template, the resulting mesoporous LaNiO3 reached a specific surface area as high as 200 m2/g. In a second step, Ni nanoparticles were exsolved to reach the final catalyst, yielding 89 % NH3 conversion at 550 °C and a GHSV of 30 000 mL/gcata.h, with a stability of at least 72 h. Due to the extended specific surface area of LaNiO3, exsolved Ni nanoparticles were highly dispersed which greatly enhanced the catalytic performance. This catalyst achieved a H2 formation rate of 29 mmol/gcata.min which is higher than any previously reported doped LaNiO3. This work demonstrates the feasibility to produce both noble metal and promoter-free LaNiO3 being particularly active and stable in efficient H2 production from NH3 decomposition.
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Citations
Gamez Rivera, S. A., Romdhane, F. B., Schnee, J., & Gaigneaux, E. (2025). Ni-exsolved catalysts from hard templated mesoporous LaNiO3 perovskite for highly efficient NH3 decomposition. Chemical Engineering Journal, 506, 160377. https://doi.org/10.1016/j.cej.2025.160377 (Original work published 2025)