| http://www.w3.org/ns/prov#value | - These co-catalysts are preferable based on the elements from Groups VIIB, VIII, IB, IIB, IVA or VA of the Periodic Table of the Elements such as manganese, cobalt, nickel, copper, zinc, zirconium germanium, antimony, or bismuth, especially compounds based on an element from the foregoing Groups metals, such as bivalent metals, and particularly chelates of metals, or oxides or salts of these metals
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