期刊
APPLIED CATALYSIS A-GENERAL
卷 647, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcata.2022.118904
关键词
CO2 capture; Layered double hydroxide; CO2 hydrogenation; Methanation; Dual-function material
Ni-based catalysts prepared using LDH as precursors show porous structures with highly dispersed Ni-metal nanoparticles, and the addition of Mg and Ca enhances the catalyst's activity and CO2 adsorption capacity.
Ni-based catalysts prepared using layered double hydroxides (LDH) as precursors containing Mg and Ca are examined as dual-function materials for CO2 capture and methanation. X-ray diffraction, thermogravimetric analysis, H2 temperature-programmed reduction, N2 adsorption, and scanning transmission electron microscopy analyses revealed that the LDH-derived Ni catalysts form porous structures of composite oxides (MgO-NiO) containing 5-nm-sized micropores and highly dispersed 5-10-nm-sized Ni-metal nanoparticles. The methanation performance is investigated under isothermal cyclic operation with an O2-containing gas (10%-CO2/5%-O2/bal.-He) and 20%-H2/bal.-He at 320 degrees C; the results indicate that the LDH-derived Ni catalysts containing Ca, Mg, and Al exhibit high methanation activities. Mg contributes to the stabilization of the porous structure and enhances the Ni-metal dispersion, while Ca provides effective CO2 adsorption and storage sites.
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