N° 447 janvier 2020

Promotion of heterogeneous catalysts

Pagination : 12-19
Rubrique : Recherche et développement
Sous-rubrique : Médailles 2018 du CNRS

Modification of metal catalysts by promoters for reaction A to C. Traditional
promotion leads to broad distribution of promoter in comparison with selective modification.

Supported metal-based heterogeneous catalysts are widely used in all areas of chemistry. The catalytic performance of metal catalysts can be improved by addition of small amounts of so-called promoters, which can be either metals or non-metallic elements.

The promoters can modify the dispersion, morphology and intrinsic activity of the catalytically active phases. They may affect the catalyst texture and mechanical properties and even introduce new types of catalytically active species. Very often, the promoter distribution on the catalyst surface is considered to be uniform and immobile. Selective deposition and use of highly mobile promoters such as soldering metals, carbon species and iodine provide unique opportunities for design of highly efficient and sustainable heterogeneous catalysts and for performing catalytic reactions in a different way.

The elaborated strategy significantly improves catalyst activity, selectivity to the target products, and stability. Several examples of this strategy are given in this article for the reactions of Fischer-Tropsch synthesis, amination and etherification.

Vitaly Ordomsky was avarded the CNRS Bronze Medal in 2018.