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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 c

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 m3/g, and the specific surface area is from 250 to 800 m2/g. The silica particles are particularly suitable for use as catalyst supports.

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Amorphous, approximately spherical silica particles obtained by the acidic hydrolysis of an approximately spherical synthetic calcium silicate having a particle size of from 20 to 120 m15 to 80 m1.3 to 3 cm3/g, and a specific surface area of from 250 to 800 m2/g. A method for preparing amorphous, ap

Amorphous, approximately spherical silica particles obtained by the acidic hydrolysis of an approximately spherical synthetic calcium silicate having a particle size of from 20 to 120 m15 to 80 m1.3 to 3 cm3/g, and a specific surface area of from 250 to 800 m2/g. A method for preparing amorphous, approximately spherical silica particles having an average external particle size of from 15 to 80 m1.3 to 3 cm3/g, and a specific surface area of from 250 to 800 m2/g comprising subjecting to acidic hydrolysis an approximately spherical synthetic calcium silicate having a particle size of from 20 to 120 m0.6 to 3.0 at approximately room temperature with an acid that does not form a sparingly soluble calcium salt, separating the resulting insoluble silica particles, washing the separated particles with water, and drying the washed particles. A supported catalyst comprising a catalytically effective amount of a catalyst supported on the amorphous silica particles of claim 1.