Solid-state interactions in Li-doped Ni/MgO catalysts
- 1 January 1998
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 94 (22) , 3385-3391
- https://doi.org/10.1039/a806033i
Abstract
The effects of the addition of Li (Liat:Niat ≈ 1:3) on the structure and reducibility of a 19% Ni/MgO catalyst, calcined at TC 400–800 °C, have been investigated by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), temperature-programmed desorption and reduction (TPD and TPR) and transmission electron microscopy (TEM). Li causes melting of the MgO matrix, markedly altering the morphology of the Ni/MgO catalyst. Li enhances the diffusion of Ni ions into the MgO lattice and the consequent formation of an NixMg(1−x)O solid solution. Li also promotes the reduction of the Ni/MgO system, enabling easier extraction of Ni2+ ions located in the MgO lattice. Solid-state interactions accounting for marked changes in both the physico-chemical properties and the reactivity of the Li-doped Ni/MgO catalyst are highlighted.Keywords
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