Ethanal is prepared industrially by air oxidation of ethylene using palladium chloride as catalyst and _________ as promoter? March 18, 2019 – by admin Ethanal is prepared industrially by air oxidation of ethylene using palladium chloride as catalyst and _________ as promoter? A. PdCl2 B. Cu2Cl2C. CuCl2 D. PbCl2