Enhanced methane dry reforming using Ni-Co bimetallic catalysts supported on lanthanum-zirconia.
4 affiliations
- 1Department of Chemistry, College of Science, King Saud University (KSU) P.O. Box 2455 Riyadh 11451 Saudi Arabia.
- 2Nuclear Technologies Institute (NTI), King Abdulaziz City for Science and Technology (KACST) P.O. Box 6086 Riyadh 11442 Saudi Arabia.
- 3Chemical Engineering Department, College of Engineering, King Saud University (KSU) P.O. Box 800 Riyadh 11421 Saudi Arabia [email protected].
- 4Hydrogen Technologies Institute, King Abdulaziz City for Science & Technology (KACST) Riyadh Saudi Arabia.
Abstract
Monometallic (Ni and Co) and bimetallic (Ni-Co) catalysts supported on lanthanum-zirconia (LaZr) were synthesized with different ratios of 1.25Ni-3.75Co, 2.5Ni-2.5Co, 3.75Ni-1.25Co and 4.25Ni-0.75Co and evaluated for the dry reforming of methane (DRM) process. The total metal loading was adjusted to 5 wt% in all catalysts. The catalysts evaluation was performed at a stoichiometric CH₄/CO₂ feed ratio of 1, in a fixed-bed stainless steel reactor at 750 °C under atmospheric pressure. This work evaluates the effect of Ni/Co ratio on catalytic performance, CO₂ desorption behaviour and carbon accumulation. The catalysts were characterized by techniques: H₂-temperature-programmed reduction (H₂-TPR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX), transmission electron microscopy (TEM) to monitor the textural, structural, and surface characteristics change with varying the chemical composition and link these characteristics with the catalytic efficiency. The 4.25Ni-0.75Co-LaZr catalyst showed the highest initial activity, achieving CH₄ and CO₂ conversions of 82.07 and 82.74%, respectively, together with the highest H₂ yield of 78.81% under the investigated conditions, with CH₄ conversion reaching 75.16% after 360 min. CO₂-TPD showed composition-dependent desorption behaviour, with more pronounced high-temperature features for Co-rich catalysts. TGA indicated moderately lower carbon deposition for 4.25Ni-0.75Co-LaZr than for 5Ni-LaZr (34.7 versus 41.9 wt%), while Raman spectra indicated differences in the structural disorder of the carbon. These findings highlight the potential of Ni-Co/LaZr catalysts for syngas production and demonstrate the influence of Ni/Co ratio on catalytic performance and carbon accumulation during DRM.
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BibTeX
@article{alotaibi2026enhanced,
title = {{Enhanced methane dry reforming using Ni-Co bimetallic catalysts supported on lanthanum-zirconia.}},
author = {Waad M Alotaibi and Salwa B Alreshaidan and Abdulaziz A M Abahussain and Rehab M Ali and Ahmed A Ibrahim and Ghzzai Almutairi and Mathkar Alharthi and Hamid Ahmed and Mohammed Alsaleh and Ahmed S Al-Fatesh},
journal = {RSC advances},
year = {2026},
month = oct,
doi = {10.1039/d6ra05341f},
url = {https://europepmc.org/article/MED/42936207},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - Enhanced methane dry reforming using Ni-Co bimetallic catalysts supported on lanthanum-zirconia.
AU - Waad M Alotaibi
AU - Salwa B Alreshaidan
AU - Abdulaziz A M Abahussain
AU - Rehab M Ali
AU - Ahmed A Ibrahim
AU - Ghzzai Almutairi
AU - Mathkar Alharthi
AU - Hamid Ahmed
AU - Mohammed Alsaleh
AU - Ahmed S Al-Fatesh
PY - 2026
DA - 2026/10/26
JO - RSC advances
DO - 10.1039/d6ra05341f
UR - https://europepmc.org/article/MED/42936207
AB - Monometallic (Ni and Co) and bimetallic (Ni-Co) catalysts supported on lanthanum-zirconia (LaZr) were synthesized with different ratios of 1.25Ni-3.75Co, 2.5Ni-2.5Co, 3.75Ni-1.25Co and 4.25Ni-0.75Co and evaluated for the dry reforming of methane (DRM) process. The total metal loading was adjusted to 5 wt% in all catalysts. The catalysts evaluation was performed at a stoichiometric CH₄/CO₂ feed ratio of 1, in a fixed-bed stainless steel reactor at 750 °C under atmospheric pressure. This work evaluates the effect of Ni/Co ratio on catalytic performance, CO₂ desorption behaviour and carbon accumulation. The catalysts were characterized by techniques: H₂-temperature-programmed reduction (H₂-TPR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX), transmission electron microscopy (TEM) to monitor the textural, structural, and surface characteristics change with varying the chemical composition and link these characteristics with the catalytic efficiency. The 4.25Ni-0.75Co-LaZr catalyst showed the highest initial activity, achieving CH₄ and CO₂ conversions of 82.07 and 82.74%, respectively, together with the highest H₂ yield of 78.81% under the investigated conditions, with CH₄ conversion reaching 75.16% after 360 min. CO₂-TPD showed composition-dependent desorption behaviour, with more pronounced high-temperature features for Co-rich catalysts. TGA indicated moderately lower carbon deposition for 4.25Ni-0.75Co-LaZr than for 5Ni-LaZr (34.7 versus 41.9 wt%), while Raman spectra indicated differences in the structural disorder of the carbon. These findings highlight the potential of Ni-Co/LaZr catalysts for syngas production and demonstrate the influence of Ni/Co ratio on catalytic performance and carbon accumulation during DRM.
SN - 2046-2069
ER -