TY - JOUR
T1 - Shaping of sulfated zirconia catalysts by extrusion: understanding the role of binders
AU - Devyatkov, Sergey Yu.
AU - Zinnurova, Aigiza Al.
AU - Aho, Atte
AU - Kronlund, Dennis
AU - Peltonen, Jouko
AU - Kuzichkin, Nikolai V.
AU - Lisitsyn, Nikolay V.
AU - Murzin, Dmitry
N1 - tk.
fyke
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
KW - engineering education
KW - engineering education
KW - engineering education
U2 - 10.1021/acs.iecr.6b00820
DO - 10.1021/acs.iecr.6b00820
M3 - Artikel
SN - 0888-5885
VL - 55
SP - 6595
EP - 6606
JO - Industrial & Engineering Chemistry Research
JF - Industrial & Engineering Chemistry Research
IS - 23
ER -