Silicalite-1 support with non-porous,microporous and micro-mesoporous were prepared by hydrothermal synthesis method and mixed alkali post-treatment method,respectively.The catalytic activity and stability of gold catalysts supported on silicalite-1 with different pore sizes in the synthesis of vinyl chloride by acetylene hydrochlorination were investigated.The structural characteristics of silicalite-1 were characterized by XRD,IR and physical adsorption instrument.The gold particle sizes and surface acid-base properties of the catalyst surface were analyzed by TEM and NH3/CO2-TPD.Combined with the activity and carbon deposition of the catalysts,it was found that the micro-mesoporous silicalite-1 as the support was beneficial to inhibit the movement and aggregation of gold particles on the catalyst and improve the reaction mass transfer efficiency,thereby significantly improving the acetylene hydrochlorination activity and stability of the catalyst.
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