| http://www.w3.org/ns/prov#value | - Preferred additional catalytic promoter materials include phosphorus, titanium, zirconium, hafnium, vanadium, manganese, magnesium, calcium, lanthanum, copper, Group VIB metals including chromium, molybdenum and tungsten, as well as more of the same Group VIII metal as contained in the Group VIII metal-containing calcined particulate or different Group VIII metals.
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