Surface reduction method was used for preparation of Pd-Ag(Cu) bimetallic catalysts.
Hydrodechlorination of 1,2-dichloroethane was investigated for production of ethylene.
Ag(Cu) selectively deposited on Pd surface during surface reduction process.
Ethylene selectivity was enhanced over Pd-Ag(Cu)/Al2O3 catalyst prepared by surface reduction.
Isolated Pd site is the key species for ethylene selectivity.