N'oge na-adịbeghị anya, ụlọ ọrụ kemịkalụ Showa Denko, nke mepere ụlọ ọrụ ethylene oxidation na Ōita, Japan, na 1997, na-ere ahịa ntụgharị nke ethylene na acetic acid. Usoro a na-eme ka palladium metal catalyst kwadoro na acid heteropoly dị ka silicotungstic acid. Usoro yiri nke ahụ na-eji otu ihe ahụ na-eme ka metal dị na silicotungstic acid na silica: Ajụjụ: Gịnị bụ usoro a catalyzed site?
palladium metal catalyst kwadoro na heteropoly acid