We successfully synthesized C-x-y mesoporous carbon materials with rational controllable pore sizes in the range of 5.6-40.2 nm,and the catalytic performance of 0.5%AuCl3/C-x-y catalysts during acetylene hydrochlorination was investigated.Here,catalytic performance dates presented that the pore size variation has a great influence in the initial activity,and that lager mesoporous carbon supports could accelerate reaction rate can result in the higher acetylene conversion.Furthermore,coke contents in catalyst supports revealed that catalytic reaction mainly rely on mesoporous,while the micropores can be identified as voids to some extent.Definitely,regular catalytic performance depending on pore sizes will be beneficial for acetylene hydroclorination in view of fast molecular diffusion to suppress coke formation.