III International Conference

PP-II-48aluminas are in the range of 0.7913-0.7922 nm which is typical for low temperature aluminas.Specific surface area was in the range 250-310 m 2 /g (depending on used electrolyte).All hydroxides and aluminas may be shaped as granules by extrusion of plastic pastes.After their calcination at 550 o C/4 hours granules characterized with different phasecomposition, porosity, strength, specific surface area depending on preparationconditionswere prepared. Granules prepared from hydroxides (even from bayerite-likehydroxide) were characterized with mono, bi or three size pores (depending on usedelectrolyte for paste preparation) and rather good strength: P o =17-50 kg/cm 2 . Their specificsurface area was in the range 300-400 m 2 /g, moisture capacity - 0.5-0.8 ml/g, packed density -0.64-0.75 g/ml. Granules prepared from hydroxide and oxide (1:1) were characterized withhigher strength (up to 85 kg/cm 2 ), specific surface area was in the range 260-350m 2 /g,moisture capacity - 0.4-0.65 ml/g, packed density - 0.45-0.55 g/ml.For alumina prepared from hydrated in acid Tseflar treated gibbsite an unusual acid –baseproperties were revealed by IRS using CO probe molecule.Hence series of different aluminas with different physical, chemical and mechanicalproperties can be prepared using Tseflar treated gibbsite (by TSEFLAR TM technology).References1. Pinakov V.I., Stoyanovsky O.I., Tanashev Yu.Yu. et al.//Chem. Eng. J. 107/1-3 (2005) 157.2. Isupova L.A., Tanashev Yu.Yu., Kharina I.V. et al. //Chem. Eng. J. 107/1-3 (2005) 163.3. Kharina I.V., Isupova L.A., Litvak G.S. et al.//Kinetika i Kataliz (in Russian), 2005 (in press).251