| http://www.w3.org/ns/prov#value | - Catalysts useful in the present oligomerization process are described in the aforementioned U.S. Pat. Nos. 4,145,315; 4,100,219 and 4,060,568; the entire contents of which are expressly incorporated herein by reference, especially insofar as these patents describe methods for impregnating the interior pore space of zeolites with amorphous silica.
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