Solids mixing mechanisms, cohesive

Due to theirs poor physical characteristics some catalytically active solids (non-cohesive particles for example) cannot be used in a catalytic reactor. They must be mixed to another material called the matrix. This latter material, which can have catalytic properties, allows the shaping of the active phase under the form of spheres, extrudates, pellets... and brings the required physical and mechanical properties. As they present many advantages, silica-aluminas are widely used as matrices, in cracking catalysts for example. 

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