Ni(0) Ex‐Phyllosilicates as Efficient and Stable Low Temperature CH4 Dry Reforming Catalyst

• Published in: ChemCatChem 2023-07, Vol.15 (14), p.n/a
• Main Authors: Ciotonea, Carmen, Wei, Yaqian, Ungureanu, Adrian, Catrinescu, Cezar, Gardol, Olivier, Mamede, Anne‐Sophie, Dumeignil, Franck, Paul, Sébastien, Jalowiecki‐Duhamel, Louise, Royer, Sébastien
• Format: Article
• Language: English
• Subjects: Carbon dioxide; Catalysis; Catalysts; CH4, dry reforming; Chemical Sciences; High resistance; hydrogen, nanoparticles; Low temperature; Methane; Nanoparticles; phyllosilicate, transition metal; Reforming; Sintering (powder metallurgy); Stability tests; Synthesis gas
• ISSN: 1867-3880; 1867-3899; 1867-3899
• DOI: 10.1002/cctc.202300245

This study explores the performances of nickel‐based materials for the dry reforming of methane (DRM), an important process for hydrogen and syngas productions. Ni nanoparticles are issued from porous phyllosilicate phase exolution under reducing conditions (in situ or ex situ). Phyllosilicate precursors were obtained by deposition/precipitation with urea onto SBA‐15 porous silica, with metal loading up to 40 wt.%. Reaction was performed at 600–700 °C. The successful formation and stabilization of highly dispersed nanoparticles (2–6 nm) is revealed, even for highly loaded formulations (20 wt.% and 40 wt.%). In DRM‐700 (CH4/CO2=1, 20 % CH4, 480,000 mL gcat−1 h−1) the formulation at 20 wt.% metal loading (Ni_20 %) activated during reaction affords 50 % and 65 % of CH4 and CO2 conversions respectively at 700 °C. Ni_20 % is showing excellent resistance toward sintering after DRM stability test of 80 h. Characterizations made for spent catalyst show high resistance toward sintering and limited carbon formation. Dry reforming of methane: Highly stable and dispersed nanoparticles of metallic Ni prepared via phyllosilicates phases are showing excellent performance over CH4 dry reforming. Several reaction parameters are studied including concentrated stream of 50 % CO2 and 50 % CH4 and stability test of 80 h, the spent catalyst showed no sintering and limited carbon accumulation.