Design and applications of structured catalytic supports synthesized by coating in spherical geometry: a review

Abstract

The methods used to synthesize structured catalytic supports by coating in spherical geometry are reviewed. The different procedures are influenced by the pretreatments of the substrate, the deposition technique of the layers, the coating materials, like Al2O3, MgAl2O4 or ZnAl2O4, and the final treatments to achieve coating layers with suitable conditions of thickness and resistance to cracking and peeling under the severe operating conditions of the process. These novel structured materials have commercial applications, mainly as supports of mono and bimetallic catalysts for the reaction of paraffin dehydrogenation reaction at high temperatures. In addition, other coating methods on spheres with applications in photocatalysis are included.