According to the present invention, any metals or compound containing a metal or element selected from the group consisting of Group IA, Group IIA, Group IIIA, Group IVA, {HEAD ~ Group VA}, Group IIB, Group IIIB, Group IVB, {TAIL ~ Group VIB}, of the Periodic Table of the Elements, and combinations of two or more thereof can be used as promoter 
According to the present invention , any metals or compound containing a metal or element selected from the group consisting of Group IA , Group IIA , Group IIIA , Group IVA , { HEAD ~ Group VA } , Group IIB , Group IIIB , Group IVB , { TAIL ~ Group VIB } , of the Periodic Table of the Elements , and combinations of two or more thereof can be used as promoter
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