Showing papers by "Shankar Narayanan published in 1987"
TL;DR: 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 in this article, where an electronic interaction with the formation of Li−O−Ni is proposed to explain this phenomenon.
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.
18 citations
TL;DR: 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 in this article, where an electronic interaction with the formation of Li−O−Ni is proposed to explain this phenomenon.
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.