Binding agents spray dried

Modified zeolites for use in an industrial reactor should have the right physical form and shape implied by the choice of the reactor (Chapter 9). FCC in a fluid-bed reactor requires spherical particles (70-100 [im), obtained by spray drying of the [im-sized USY zeolite crystals in the presence of a binder, viz. silica, alumina, and clays [21]. Extrusion requires a binding agent that attributes to the zeolite/binder mixture tixotropic properties in the extruder [22]. As the catalyst binder may be active, it exceeds the role of diluent agent for the active zeolite [21]. Indeed, the steam stability of some zeolites is known to be enhanced in a binder[Pg.244]

Wet laid media are derived from paper manufacturing processes and are composed of short staple fibres dispersed in water to form a slurry that is fed to a moving wire screen on which it is dewatered. The randomly orientated fibres form a web which is dried by a sequence of heated rollers. An adhesive or binding agent may be dispersed in the original slurry or sprayed onto the web during or after dewatering. 

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