Catalytic Oxidation of CO over Nanocrystalline La_1–xCe_xNiO₃ Perovskite‐Type Oxides

Abstract

Nanocrystalline La1–xCexNiO3 (x = 0.1, 0.3, 0.5, 0.7, 0.9) perovskite‐type oxide catalysts prepared by the Pechini method were employed in catalytic CO oxidation and the effect of substitution of La by Ce on CO conversion was evaluated. The results indicated the remarkable effect of La substitution with Ce on the catalytic performance at low temperatures. The reaction temperature had a significant influence on the stability of the catalysts. The La0.1Ce0.9NiO3 sample exhibited the highest activity among the prepared catalysts in CO oxidation reaction. In addition, the influence of different parameters including pretreatment condition, feed ratio, and gas hourly space velocity (GHSV) on the catalytic performance was examined. The optimum catalyst proved high stability under severe reaction conditions in the presence of water vapor and CO2 in the feed stream.

Oxygen vacancies engineering by coordinating oxygen-buffering CeO2 with CoO nanorods as efficient bifunctional oxygen electrode electrocatalyst

“…The isotherms of both samples show a typical type-IV characteristic, with H2 hysteresis loop associated with the mesoporous structure having strong interconnection (ink-bottle pores)[47]. This result clarifies that the H2-type hysteresis loop is relevant to cobalt oxides nanorods with nearly cylindrical channels[48]. The average pore diameters are 3.62 and 4.07 nm of CoO x /RGO and CoO x /CeO 2 /RGO samples, respectively, see inset in Fig.5(a).…”