Carbon-supported gold catalysts serve as sustainable alternatives to the toxic mercuric chloride catalyst in the industrial hydrochlorination of acetylene.The porosity and surface defects of catalytic materials have a...Carbon-supported gold catalysts serve as sustainable alternatives to the toxic mercuric chloride catalyst in the industrial hydrochlorination of acetylene.The porosity and surface defects of catalytic materials have a significant impact on the performance of heterogeneous catalysts.Herein,a sheet-like carbon stabilized atomically dispersed Au catalyst(Au-CSC-850)with a hierarchically porous nanostructure and extensive surface void defects has been synthesized by a one-step pyrolysis method using cationic starch as a carbon precursor.The irregular dispersion of surface void defects within the Au-CSC-850 catalyst effectively interconnects the nanochannels and enhances the adsorption capacity for acetylene molecules.The activity of the Au-CSC-850 catalyst is significantly enhanced by the hierarchically porous structure derived from cationic starch,in comparison with that of the microporous Au-SC-850 catalyst obtained from pristine starch.The Au-CSC-850 catalyst demonstrated exceptional stability in durability tests,as evidenced by the absence of any significant activity loss over a 200-hour long-term reaction period.This work elucidates the profound influence of porous nanostructures and void defects on the catalytic activity of acetylene hydrochlorination catalysts,offering a convenient approach to fabricate highly efficient carbon supported metal catalysts.展开更多
基金supported by the National Natural Science Foundation of China(NSFC Grant No.21908197)The Key Research and Development Program of Inner Mongolia(No.2019ZD017)is gratefully acknowledged。
文摘Carbon-supported gold catalysts serve as sustainable alternatives to the toxic mercuric chloride catalyst in the industrial hydrochlorination of acetylene.The porosity and surface defects of catalytic materials have a significant impact on the performance of heterogeneous catalysts.Herein,a sheet-like carbon stabilized atomically dispersed Au catalyst(Au-CSC-850)with a hierarchically porous nanostructure and extensive surface void defects has been synthesized by a one-step pyrolysis method using cationic starch as a carbon precursor.The irregular dispersion of surface void defects within the Au-CSC-850 catalyst effectively interconnects the nanochannels and enhances the adsorption capacity for acetylene molecules.The activity of the Au-CSC-850 catalyst is significantly enhanced by the hierarchically porous structure derived from cationic starch,in comparison with that of the microporous Au-SC-850 catalyst obtained from pristine starch.The Au-CSC-850 catalyst demonstrated exceptional stability in durability tests,as evidenced by the absence of any significant activity loss over a 200-hour long-term reaction period.This work elucidates the profound influence of porous nanostructures and void defects on the catalytic activity of acetylene hydrochlorination catalysts,offering a convenient approach to fabricate highly efficient carbon supported metal catalysts.
