| http://www.w3.org/ns/prov#value | - The usual promoters are transition metal salts and acetylacetonates of cobalt, potassium, copper, vanadium, zirconium, manganese and lead such as cobalt naphthenate, cobalt octoate, cobalt 2-ethylhexanoate, divalent and trivalent acetylacetonatocobalt, potassium hexanoate, zirconium naphthenate, vanadium naphthenate, cupric naphthenate, manganese octoate, ferric naphthenate, potassium hexanoate, a
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