In situ synthesis of Co–Ni nanocomposite catalysts of the partial oxidation of methane from K2NiF4-like complex oxide precursors

Abstract

Oxide precursors NdCaCo[Formula: see text]NixOn ([Formula: see text]) are obtained by the solid-state synthesis method at 1100[Formula: see text]C. According to XRD analysis, the main components of these precursors are complex oxides with K2NiF4-like structure at [Formula: see text] and with rhombically distorted K2NiF4 structure at [Formula: see text]. A thermal decomposition of these precursors in the mixture of CH4/O[Formula: see text] at T [Formula: see text] 800[Formula: see text]C results in the formation of dense metal-oxide nanocomposite particles. As-obtained nanocomposites demonstrated a considerable catalytic activity and selectivity in the reaction of partial oxidation of methane; their catalytic properties vary non-monotonously with Co/Ni ratio. The maximum CH4 conversion and CO selectivity at 820[Formula: see text]C is demonstrated by the composite comprising Nd2O3, CaO, NiO and Ni metal nanoparticles.