Synthesis and investigation of highly dispersed active phases of intermetallic and supported SHS-catalysts

Abstract

In the present study, the active phases (AP) of an Fe–Ni–Co–Mn catalyst produced from SHS-intermetallics (a), a catalyst prepared via formation an intermetallic layer on a mesh surface of chromium-nickel stainless steel (b), and of a Co–Mn catalyst prepared via SHS on silica gel support (c), were isolated and characterized by SEM and XRD. The catalysts studied were highly active in the process of deep oxidation and catalysts (b) and (c) were highly active in the process of CO2 methanation as well. All AP had oxo-metallic composition and were formed from nanoscale components, but if the structure of these components for catalyst (a) was the same as on the surface of the catalyst, the structures of AP components for catalyst (b) significantly differed from the surface structures. In addition, AP sediment grain nanostructures of catalyst (c) differed from those of catalysts (a) and (b).

CO2 Methanation: Nickel–Alumina Catalyst Prepared by Solid-State Combustion

“…They are well-crystallized and can be used as catalysts in important chemical processes including CO 2 methanation. Currently, aqueous solutions of nickel nitrate with urea and aluminum hydroxide [34] or nitrate [45] are used for the synthesis of effective nickel-based catalysts by solution combustion technique and selfpropagating high-temperature synthesis [46]. This work aims to develop a new approach to the synthesis of nanoscale nickelalumina catalysts for CO 2 methanation based on solid-state combustion (SSC) without using any solution [44].…”