Impact of Sr addition on zirconia-alumina-supported Ni catalyst for COx-free CH4 production via CO2 methanation

Abdulaziz A. M. Abahussain, Ahmed S. Al-Fatesh*, Yuvrajsinh B. Rajput, Ahmed I. Osman*, Salwa B. Alreshaidan, Hamid Ahmed, Anis H. Fakeeha, Abdulrhman S. Al-Awadi, Radwa A. El-Salamony, Rawesh Kumar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
4 Downloads (Pure)

Abstract

Zirconia-alumina-supported Ni (5Ni/10ZrO2+Al2O3) and Sr-promoted 5Ni/10ZrO2+Al2O3 are prepared, tested for carbon dioxide (CO2) methanation at 400 °C, and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, surface area and porosity, infrared spectroscopy, and temperature-programmed reduction/desorption techniques. The CO2 methanation is found to depend on the dispersion of Nickel (Ni) sites as well as the extent of stabilization of CO2-interacted species. The Ni active sites are mainly derived from the reduction of ‘moderately interacted NiO species’. The dispersion of Ni over 1 wt % Sr-promoted 5Ni/10ZrO2+Al2O3 is 1.38 times that of the unpromoted catalyst, and it attains 72.5% CO2 conversion (against 65% over the unpromoted catalyst). However, increasing strontium (Sr) loading to 2 wt % does not affect the Ni dispersion much, but the concentration of strong basic sites is increased, which achieves 80.6% CO2 conversion. The 5Ni4Sr/10ZrO2+Al2O3 catalyst has the highest density of strong basic sites and the highest concentration of active sites with maximum Ni dispersion. This catalyst displays exceptional performance and achieves approximately 80% CO2 conversion and 70% methane (CH4) yield for up to 25 h on steam. The unique acidic–basic profiles composed of strong basic and moderate acid sites facilitate the sequential hydrogenation of formate species in the COx-free CH4 route.
Original languageEnglish
Pages (from-to)9309-9320
Number of pages12
JournalACS Omega
Volume9
Issue number8
Early online date14 Feb 2024
DOIs
Publication statusPublished - 27 Feb 2024

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering

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