Al-Fatesh AS, Kaydouh MN, Ahmed H, Ibrahim AA, Alotibi MF, Osman AI, El Hassan N. Sr Promoted Ni/W-Zr Catalysts for Highly Efficient CO
2 Methanation: Unveiling the Role of Surface Basicity.
LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023;
39:17723-17732. [PMID:
38029289 PMCID:
PMC10720459 DOI:
10.1021/acs.langmuir.3c02304]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 11/10/2023] [Accepted: 11/14/2023] [Indexed: 12/01/2023]
Abstract
This study explores the employment of CO2 methanation for carbon dioxide utilization and global warming mitigation. For the first time, in this work, we combine the interesting properties of the WO3-ZrO2 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% CO2 conversion and 82% CH4 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 CO2 adsorption and conversion sites, enhancing the catalytic performance.
Collapse