The Influence Of Carbon Support On The HgCl₂/AC For Hydrochlorination Of Acetylene

The support is the essential part of the heterogeneous catalysts,its properties have great influence to the catalytic performance.This paper studied the properties of the supports including pore structure,ash,surface chemical properties,and their influence to catalytic performance of AC supported HgCl₂ catalyst.The main results are as followings:1.The effect of the pore structure and surface chemical properties of various ACs on the adsorption properties of mercury chloride from aqueous solutions was studied for the development of catalyst preparation method.The results reveal that AC with higher surface area,higher fraction of mesopores and more basic chemical groups have larger adsorption capacity of mercury chloride.The catalysts were prepared by excessive dipping method.By this method,the loading of mercury chloride on the ACs were much lower than their adsorption capacity,and their adsorption ratio of mercury chloride was more than 94%.2.There are 15 ACs which produced by various resources and from different producer have been chosen to prepare the AC supported HgCl₂catalysts.And the relations between the properties of ACs and the performance of the catalysts are studied.The results reveal that the ash species and ash content of ACs have greater influence to the catalytic performance than their pore structure and specific surface area.The less the ash content,the better the performance is.3.The surface chemical properties of supports are modified by nitric acid,hydrochloric acid and high temperature hydrogen.The reaction performance and characterization results reveal that the amount of oxygen surface groups may have a specific value to maximize the catalytic performance.The catalytic performance increased with the increase of surface alkaline,which was caused by urea modified.