反应性挤出技术制备碳基乙炔氢氯化催化剂OACHSSCDCSTPCD

Au catalysts are crucial for the mercury-free acetylene hydrochlorination reaction.Enhancing their sta-bility is a key and challenging research focus.Developing novel support materials is a preferred strategy to improve the stability of Au catalysts.Reactive extrusion technology allows precise control of reaction condi-tions,combining material synthesis and shaping into a single process,enabling continuous production and signif-icantly enhancing synthesis efficiency when preparing carbon-based materials.Guar gum was used as the pri-mary precursor to synthesize carbon-based materials doped with diverse heterogeneous elements through reac-tive extrusion technology.These carbon-based materials were then impregnated with chloroauric acid for the acetylene hydrochlorination reaction.Experimental results reveal that the Au catalyst Au/G-N,with nitrogen-doped porous carbon as the carrier,exhibits excellent catalytic stability.The acetylene conversion rate catalyzed by Au/G-N was 83% at a volumetric airspeed of 180 h-1 and a reaction temperature of 180℃,with only a 3% decrease in conversion rate after 3 600 minutes of reaction.This is primarily attributed to the interaction between nitrogen atoms and Au species in the carrier,enhancing Au dispersion and reducing the aggregation of oxidized Au after reduction.Additionally,nitrogen introduction effectively suppresses carbon deposition on the catalyst,preventing catalyst deactivation due to the coverage of active sites.