Efficient CoMoS Catalysts Supported on Bio-Inspired Polymer Coated Alumina for Hydrotreating Reactions
Résumé
Organic additives are widely used in order to improve the
performance of hydrotreating catalysts. Yet, the use of
polymers, in particular bio-polymers, is less widespread. We
present, herein, a strategy to coat alumina support with a biopolymer,
namely polydopamine (Pdop). The Pdop coated
supports provide a higher number of adsorption sites for Mo
species compared to the bare support. The hydrotreating
catalyst prepared on Pdop coated support showed improved
performances for various hydrotreating reactions (aromatic
hydrogenation, gas-oil HDS and HDN). The increase in activity
is ascribed to a better accessibility of active sites, and the
presence of carbon adlayer between the active phase and
alumina limiting detrimental direct metal support interactions.
Modification of the alumina surfaces by Pdop creates new
adsorption sites for metallic precursors, thereby allowing an
improved accessibility of active sites especially at high surface
densities.