Abstract
For Ni/CeZrO catalyst prepared in supercritical isopropanol main features of methane dry reforming reaction mechanism were studied by the pulse microcalorimetric technique. The reaction scheme is described by a step-wise redox mechanism with independent stages of CH4 transformation on Ni/support interface producing syngas with participation of support oxygen bridging species (the rate-limiting stage) and fast reoxidation of support sites by CO2 yielding CO regenerating reactive oxygen species.
Highlights
Catalysts consisting of metal nanoparticles (Pt, Ru, Ni + Ru) deposited on the surface of fluorite-like (Ln–Ce–Zr–O) oxides with high surface/lattice oxygen mobility and reactivity demonstrate high activity and stability to coke formation in dry methane reforming [1,2,3,4,5]
This is explained by the bifunctional scheme of the reaction mechanism including activation of CH4 on metal sites, CO2 —on oxide sites with the subsequent rapid transfer of oxygen species to the metal-support interface, where they interact with activated CHx species producing syngas [6]
NiO nanoparticles with average size ranging from 23 to 28 nm were revealed according to Transmissionelectron electronmicroscopy microscopy (TEM) (Transmission electron microscopy)
Summary
Catalysts consisting of metal nanoparticles (Pt, Ru, Ni + Ru) deposited on the surface of fluorite-like (Ln–Ce–Zr–O) oxides with high surface/lattice oxygen mobility and reactivity demonstrate high activity and stability to coke formation in dry methane reforming [1,2,3,4,5]. This is explained by the bifunctional scheme of the reaction mechanism including activation of CH4 on metal sites, CO2 —on oxide sites with the subsequent rapid transfer of oxygen species to the metal-support interface, where they interact with activated CHx species producing syngas [6]. For the Ni/SiO2 catalyst, the TAP (Temporal Analysis of Products) studies of Schuurman and Mirodatos have shown that CO2 is activated by direct dissociation on Ni atoms, whereas the rate-limiting step is the interaction between
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