| http://www.w3.org/ns/prov#value | - In a preferred embodiment, the treated polyalpha-olefin comprises 100 ppm of heteroatom containing compounds or less, preferably 10 ppm of heteroatom containing compounds or less. (A heteroatom containing compound is a compound containing at least one atom other than carbon and hydrogen.) Preferably the hydrogenation catalyst is selected from the group consisting of supported Group 7, 8, 9, and 10
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