<prompt> Iphasiwedi: Ezikhathini zamuva, inkampani yamakhemikhali iShowa Denko, evule isitshalo se-ethylene oxidation e-Ōita, eJapan, ngo-1997, yathengisa ukuguqulwa kwesiteji esisodwa eshibhile se-ethylene ku-acetic acid. Le nqubo ihlanganiswa yi-palladium metal catalyst esekelwa ku-heteropoly acid efana ne-silicotungstic acid. Inqubo efanayo isebenzisa i-catalyst efanayo yensimbi ku-silicotungstic acid ne-silica: Umbuzo: Le nqubo ihlanganiswa yini?  <response>: i-palladium metal catalyst esekelwe ku-heteropoly acid 