Abstract
Metallic nickel is known to efficiently catalyze hydrogenation reactions, but one of its major drawbacks lies in its lack of selectivity, linked to side-reactions of hydrogenolysis and over-hydrogenation. More selective hydrogenations can be obtained upon the introduction of a second metal in combination with Ni. Fe is an interesting choice, as it is a cheap and abundant metal. This review aims at discussing the advantages and constraints brought by the preparation procedures of bimetallic supported Ni–Fe nanoparticles, and at analyzing the benefits one can draw by substituting Ni–Fe supported catalysts for Ni monometallic systems for the catalytic hydrogenation of organic molecules. Specific formulations, such as Ni75Fe25, will be singled out for their high activity or selectivity, and the various hypotheses behind the roles played by Fe will be summarized.
Highlights
Compared to noble metals, non-noble metals such as Fe, Co, Ni and Cu are attractive alternatives for catalytic hydrogenations because of their low cost
The present review aims at discussing the advantages and constraints brought by different preparation procedures of bimetallic supported Ni–Fe nanoparticles, and at analyzing the benefits the literature has reported upon substituting Ni–Fe supported catalysts for Ni systems for the selective hydrogenation of organic molecules
The nominal proportions of Ni and Fe, the preparation method of Ni–Fe catalysts, the temperature of reduction, the nature of the support, all have an influence on the structure of supported Ni–Fe nanoparticles, on their size and on their actual metals content, which are likely to affect the performances of the catalyst in the hydrogenation of organic molecules
Summary
Non-noble metals such as Fe, Co, Ni and Cu are attractive alternatives for catalytic hydrogenations because of their low cost. Bimetallic Ni-based catalysts exhibit specific properties, via a synergistic or bi-functional effect, which differ from those of the parent metals and offer the opportunity to design catalysts with an activity and selectivity that exceed those achievable with monometallic nickel. The present review aims at discussing the advantages and constraints brought by different preparation procedures of bimetallic supported Ni–Fe nanoparticles, and at analyzing the benefits the literature has reported upon substituting Ni–Fe supported catalysts for Ni systems for the selective hydrogenation of organic molecules. The nominal proportions of Ni and Fe, the preparation method of Ni–Fe catalysts, the temperature of reduction, the nature of the support, all have an influence on the structure of supported Ni–Fe nanoparticles, on their size and on their actual metals content, which are likely to affect the performances of the catalyst in the hydrogenation of organic molecules. We provide elements for a better understanding of the relationships existing between these experimental parameters and the structural characteristics of Ni–Fe nanoparticles
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