Anti-coking Ni encapsulated in SiO2 via one-pot reverse microemulsion method as a versatile catalyst for CO2 methane reforming. (January 2023)

• Record Type: Journal Article
• Authors: Lim, Zi-Yian; Tu, Junling; Zhou, Fengling; Xu, Yongjun; Chen, Baiman
• Is Part Of: Journal of CO₂ utilization. Volume 67(2023)
• Publication Date: 2023-01
• Subjects: Water-to-surfactant ratio -- 2:1 nickel phyllosilicate -- Dry reforming -- Anti-coke -- Reduction-oxidation-reduction; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2022.102341
• Languages: English
• ISSNs: 2212-9820

Abstract

Abstract: This paper reports the varying water-to-surfactant (ω) ratio in reverse microemulsion on the development of Ni encapsulation in bulk SiO2 catalyst for dry reforming of methane. From XRD and TEM analyses, the Ni particle size depends on the water-to-surfactant ratio. It found that an optimized ratio of ω improves the catalytic activity for the dry reforming of methane. The catalyst (Ni-SiO2 -ω23) shows 70% CH4 conversion and 78% CO2 conversion at 700 °C and WHSV of 72000 mLgcat −1 h −1 operating for 50 h with TOF of 12.6 s −1 . It is highly anticipated that the increased fraction of 2:1 nickel phyllosilicate and small Ni particle size contributed to its improved catalytic activity corresponding to the ω ratio. Also, a higher ω value can resist carbon formation in the catalysts, characterized by XRD, TGA, Raman, XPS, and TEM. These results were encouraging that could be applied in similar high-temperature reactions. Graphical Abstract: ga1 Highlights: Different sizes of Ni nanoparticles synthesized via ω ratio. Encapsulation of Ni in bulk grains of SiO2 validated by ICP-MS, XPS, and TEM. Smaller Ni nanoparticles and increased 2:1 nickel phyllosilicate with high ω ratio. Synthesized encapsulated Ni-SiO2 with higher ω ratio capable to anti-coking. Optimized catalyst exhibited high TOFCH4 of 12.6 s −1 at 700 °C for 50 h.