Non-mercury catalytic acetylene hydrochlorination over a NH4F-urea-modified Pd/HY catalyst for vinyl chloride monomer production

A Pd/HY zeolite catalyst modified with ammonium fluoride and urea (Pd/NH4F-urea-HY) was efficiently applied in an acetylene hydrochlorination reaction. It exhibited an enhanced catalytic performance compared to the untreated Pd/HY catalyst, which was attributed to the presence of ammonium fluoride and urea partly inhibiting carbon deposition and Pd2+ reduction.