Sulfated
zirconia hydroxide shaping by extrusion is studied based
on elucidating the impact of zeta-potential and rheological characteristics
on physical and chemical properties of technical catalysts. Zeta potential
measurements of sulfated zirconium hydroxide prior and after poly(vinyl
alcohol) (PVA) additions were made. Rheological curves of sulfated
zirconium hydroxide suspensions with different amounts of PVA were
recorded at different zeta-potential values. The addition of PVA nonlinearly
decreased shear yield stress. Experimental data were quantified with
the Krieger–Dougherty equation. The influence of a boehmite-type
binder on the zeta-potential confirmed that the surface properties
of the particles to a large extent are determined by the presence
of binder. The pore structure of shaped catalysts was unaffected by
rheological parameters when zeta-potential is close enough to zero.
At the same time deviations of the zeta potential from the zero-value
afforded more uniform pore size distribution.
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