Influence of lithium on reduction, dispersion and hydrogenation activity of nickel on alumina catalysts
- 1 January 1987
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 83 (3) , 733-742
- https://doi.org/10.1039/f19878300733
Abstract
The influence of lithium modifier on the physical properties of alumina as well as on the reduction and dispersion of nickel oxide on alumina carrier is discussed. Lithium addition up to 2 wt % helps to improve the reducibility of Ni2+ ions, dispersion and metal area. It is explained on the basis of LiAl5O8 spinel formation which reduces the interaction between Ni2+ ions and alumina. A higher concentration of lithium (> 2 wt %) has a detrimental effect on reduction, dispersion and metal area. An electronic interaction, with the formation of Li–O–Ni, is proposed to explain this phenomenon. Benzene hydrogenation is used as a model reaction to compare the activity of various lithium modified nickel alumina catalysts. The effect of precalcination of the modified catalysts on reducibility is discussed.Keywords
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