| http://www.w3.org/ns/prov#value | - Furthermore, the inorganic oxide preferably to be used also has cavities or channels having an average diameter of from 0.1 to 20 ??m, in particular from 1 to 15 ??m, whose macroscopic volume fraction is from 5 to 30%, in particular from 10 to 30%, based on the total particle.
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