| http://www.w3.org/ns/prov#value | - Examples of such refractory oxide materials include alumina, silica, silica-alumina, manganese nodules, crystalline aluminosilicates and combinations thereof.Non-limiting examples of solid porous refractory oxides useful herein include siliceous materials such as silica and combinations thereof with oxides of metals of Groups II--A, III--A, IV--B and V--B of the Periodic Table, such as, for exampl
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