Effects of support on Ni-based catalysts for dry reforming of methane
<p dir="ltr">We report the development and evaluation of Ni-based catalysts supported on La<sub>2</sub>O<sub>3</sub>, ZrO<sub>2</sub>, and Al<sub>2</sub>O<sub>3</sub> for dry methane reformation. The catalysts were synthesiz...
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2025
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| Summary: | <p dir="ltr">We report the development and evaluation of Ni-based catalysts supported on La<sub>2</sub>O<sub>3</sub>, ZrO<sub>2</sub>, and Al<sub>2</sub>O<sub>3</sub> for dry methane reformation. The catalysts were synthesized using the solution combustion synthesis (SCS) method, characterized using several cutting-edge analytical tools, and tested for CO<sub>2</sub> reformation of methane in a fixed bed plug-flow reactor. Catalytic activity and physicochemical properties of the studied catalysts varied considerably, indicating that the nature of support had a considerable impact. The Ni/Al<sub>2</sub>O<sub>3 </sub>nanocatalyst outperformed the Ni/La<sub>2</sub>O<sub>3 </sub>and Ni/ZrO<sub>2</sub> catalysts in terms of catalytic activity and stability during the DRM process. During T.O.S. stability tests, the Ni/La<sub>2</sub>O<sub>3</sub> catalyst demonstrated higher initial CH<sub>4</sub> conversion (∼95.3 %) than the Ni/Al<sub>2</sub>O<sub>3</sub> catalyst (∼88.7 %). However, after 50 h on stream, the Ni/La<sub>2</sub>O<sub>3</sub> catalyst deactivated significantly, but the Ni/Al<sub>2</sub>O<sub>3</sub> catalyst remained active. Amongst the catalysts tested, the zirconia-supported Ni catalyst had the least activity and demonstrated no activity at temperatures below 800 °C. The analysis of the TPR profile of the Ni/ZrO<sub>2 </sub>catalyst demonstrated the presence of α-NiO species, indicating a weak metal to support contact, resulting in deactivation due to carbon deposition and aggregation of active sites. The thermogram of the Ni/La<sub>2</sub>O<sub>3</sub> catalyst indicated a combination of two Ni species. The first reduction peak at 342.2 °C occurred by the reduction of α-NiO species. The second reduction peak at 695 °C was caused by the reduction of surface β-NiO species. The absence of δ-NiO species in the La<sub>2</sub>O<sub>3</sub> crystals suggests that Ni<sup>2+</sup> did not induce inside the lattice. In contrast, Ni/Al<sub>2</sub>O<sub>3</sub> showed the presence of NiAl<sub>2</sub>O<sub>4</sub> nanocrystallite (δ-NiO) spinel and NiO-Al<sub>2</sub>O<sub>3</sub> solid solution, responsible for high activity and stability.</p><h2 dir="ltr">Other Information</h2><p dir="ltr">Published in: Cleaner Chemical Engineering<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.clce.2025.100201" target="_blank">https://dx.doi.org/10.1016/j.clce.2025.100201</a></p> |
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