Study of LaNi1-xCoxO3 Perovskites-Type Oxides Either Pure or Mixed with SiO2 as Catalytic Precursors Applied in CH4 Dry-Reforming

Lima, Débora Carvalho de Lira; Lemos, Isleide Pereira; Gomes, Ruan S.; Rodrigues, Lílian Maria Tosta Simplício; Fréty, R.; Resini, Carlo; Roberto, B. S.; Brandão, Soraia Teixeira

doi:10.1007/s10562-022-04127-8

Cited by 5 publications

(1 citation statement)

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“…In some cases, such systems demonstrate high activity, selectivity, and stability in DRM. In these compounds, the catalysts are based on nickelates and cobaltates of rare earth elements [5,11,[27][28][29][30][31][32][33]. According to these studies, the perovskite precursors of catalysts can be synthesized with various methods, such as solid-phase synthesis, self-propagating high-temperature synthesis, sol-gel synthesis, the decomposition of specially synthesized complex compounds, etc.…”

Section: Introductionmentioning

confidence: 99%

A New Approach to the Preparation of Stable Oxide-Composite Cobalt-Samarium Catalysts for the Production of Hydrogen by Dry Re-Forming of Methane

Локтев¹,

Дедов²,

Arkhipova³

et al. 2023

Preprint

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A new approach to preparing a series of Co/Sm2O3 catalysts for hydrogen production by dry re-forming of methane (DRM) is developed. The catalysts precursors are synthesized by a simple method, including evaporation of aqueous solutions of cobalt and samarium nitrates, followed by a short-term calcination of the resulting material. The as-prepared and spent catalysts are characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), temperature-programmed reduction (H2-TPR), and thermogravimetric analysis (TGA). It is shown that the content of cobalt in the synthesized materials affects their phase composition and carbonization resistance in the DRM reaction. It is demonstrated that preheating under N2 affords catalysts providing stable hydrogen and CO yields of 94-98 % for at least 50 h at 900°C. These yields are among the highest ones currently available for DRM catalysts derived from Co-Sm complex oxides. It is found that reduction in the amount of cobalt in the catalyst and its preheating to an operating temperature of 900°C in a nitrogen flow con-tribute to preventing catalyst carbonization and metal particles sintering.

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