Sn-imidazolates supported on boron and nitrogen-doped activated carbon as novel catalysts for acetylene hydrochlorination

This study mainly reports on the preparation of Sn-imidazolates (Sn(Im)(n)) supported on boron and nitrogen-doped activated carbon (AC), which proved to be highly active catalysts for the acetylene hydrochlorination. The obtained materials were characterized by FTIR spectroscopy, X-ray diffraction, N-2 physisorption, scanning electron microscopy, thermogravimetry, temperature programed desorption, and X-ray photoelectron spectroscopy. The catalytic results revealed that the Sn(Im)(n)/AC materials manifest enhanced activity and long-term stability than SnCl2/AC catalyst. Regarding the lifetime, 10%Sn(Im)(n)/(10%BNAC-800) catalyst, exhibiting an acetylene conversion of 80% after 40 h of reaction, is more promising in comparison with 10%Sn(Im)(n)/AC. These results indicate that the use of 2-methylimidazole improve the activity and stability of SnCl2/AC catalysts in the hydrochlorination of acetylene. Particularly, the supports modified with boric acid and melamine can effectively increase the lifetime of Sn(Im)(n)/AC catalysts.