<prompt> Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu: Passage: Munguva pfupi yapfuura, kambani yemakemikari Showa Denko, yakavhura nzvimbo inogadzira ethylene muŌita, kuJapan, muna 1997, yakashambadzira nzira inodhura yokushandura ethylene kuva acetic acid. Maitiro acho anokonzerwa ne palladium simbi inokonzeresa inotsigirwa pane heteropoly acid yakadai se silicotungstic acid. Nzira yakafanana inoshandisa simbi imwechete inokonzera pane silicotungstic acid uye silica: Mubvunzo: Chii chinoita kuti izvi zviitike?  <response>: palladium metal catalyst inotsigirwa pane heteropoly acid 