Sr Promoted Ni/W–Zr Catalysts for Highly Efficient CO₂ Methanation: Unveiling the Role of Surface Basicity

Abstract

This study explores the employment of CO 2 methanation for carbon dioxide utilization and global warming mitigation. For the first time, in this work, we combine the interesting properties of the WO 3 –ZrO 2 support and the benefits of Sr to improve the performance of Ni-based catalysts in this reaction. Sr loading on 5Ni/W–Zr samples is increased to 3 wt %, resulting in improved surface basicity through strong basic site formation. After 300 min, the 5Ni + 3Sr/W–Zr catalyst exhibits high activity and stability, achieving 90% CO 2 conversion and 82% CH 4 yield compared to 62 and 57% on 5Ni/W–Zr. Limited sintering and absence of carbon deposits are confirmed by temperature-programmed oxidation, XRD, Raman, and TEM analyses at 350 °C for 300 min. Sr promotion creates additional CO 2 adsorption and conversion sites, enhancing the catalytic performance.

CO2‐Steam Bi‐Reforming of Methane Over La1−xSrxNi0.8Zr0.2O3 Perovskite Catalysts to Generate Hydrogen Rich Syngas

“…As the Sr content is increased in the catalysts the amount of CO 2 desorbed also increased during CO 2 ‐TPD analysis. Similar results were observed for Sr promoted Ni/W−Zr catalysts [35] …”

Facile Synthesis Method of Zeolite NaY and Zeolite NaY-Supported Ni Catalyst with High Catalytic Activity for the Conversion of CO2 to CH4

“…For the CO 2 methanation reaction, CO 2 and H 2 are usually adsorbed on different sites on the catalyst's surface. In a typical heterogeneous catalytic system, the dissociative adsorption of H 2 often occurs on a metal active site, which is deposited on a catalyst support, while the adsorption of CO 2 often occurs on a catalyst support [1][2][3]. It is accepted that Ni was a suitable active metal for this reaction because of its high activity, high selectivity and low price [4][5][6].…”