| http://www.w3.org/ns/prov#value | - The support material is a silica or alumina which can additionally contain one or more other oxides of the elements A1, K, Mg, Na, Si, Ti, Zr and/or whose surface may have been made hydrophobic by reaction with alkyl-silanes, alkylhalosilanes, alkoxysilanes, silazanes or other alkyl compounds.
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