Redco Nv

S.a. Redco

Georges Poncelet

Octavian Anton

Pierre Jacobs

Johan Martens

Dirk Van Wouwe

Alain Gosseye

Phillippe Jacques

Amorphous, substantially spherical silica particles obtained by acidic hydrolysis of substantially spherical synthetic crystalline calcium silicates having a size of from 20 to 120 microns are coated with a layer comprising silica and alumina. The silica particles obtained may be directly employed as catalysts for the oligomerization of olefins and, having been loaded with platinum, as hydrocracking catalysts.

Silica-particles containing alumina, process for preparing same and the

Amorphous, approximately spherical silica particles prepared by the acidic hydrolysis of an approximately spherical synthetic calcium silicate having a uniform microgranular structure on their external surfaces and a structure in the interior thereof which structure only weakly recall the original crystal needle structure of the starting material. The average external particle size is from 15 to 80 .mu.m, the apparent particle volume is from 1.3 to 3 cm.sup.3 /g, and the specific surface area is from 250 to 800 m.sup.2 /g. The silica particles are particularly suitable for use as catalyst supports.

Amorphous silica particles, a method for producing same, and catalyst

The colored composite material is manufactured from materials based on a hydraulic binder and dispersed reinforcing elements, for example fibrous. To obtain a colored material, a composition comprising a baked clay such as chamotte is used generally by replacing at least in part the silica in products preferably hardened under steam pressure. The materials obtained are useful particularly as covering elements for frontages in the building industry.

Colored composite material of the asbestos-cement or similar type and

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Beauvechain, Belgium

Georges Poncelet