Activate Carbon Supported Gold Catalyst For Acetylene Hydrochlorination

In the system of non-mercury catalysts for the synthesis of PVC by the hydrochlorination of acetylene,activated carbon supported AuCl₃ catalyst has high catalytic and selectivity and is considered to be the potential catalyst for substituting mercuric chloride catalyst.This paper studied the activated carbon supports,the composition of catalyst,and preparation of gold catalysts for hydrochlorination of acetylene.The following conclusions were obtained:1.Different activated carbon supported gold catalyst has great influence to the catalytic performance,the coconut shell activated carbon with higher fraction of mesopores and a smaller amount of ash supported gold catalyst has better catalytic activity.A phosphoric acid pretreatment of activated carbon supported gold catalyst can improve initial activity dramaticlly,but it has not good stability.The loss of phosphorus and the reduction of Au³⁺ to Au0 is the main reason for catalyst deactivation.2.For the screening of bimetallic catalyst,Zn?Bi?Ni?Co?Cu?Ba?Ce?K was studied as co-catalyst Au-M/AC system.It is found that Cu?Ni and Bi can improve the Au-based catalyst initial activity dramaticlly.The bimetallic Au-Cu/AC catalysts have been optimized,when the molar ratio of Cu/Au is 0.5,the catalyst has good initial activity.When the molar ratio of Cu/Au is 1,the catalyst has good catalytic stability.3.Impregnation?deposition-precipitation and ultrasonic-assisted three mothods was studied for the activited carbon supported gold catalyst for the hydrochlorination of acetylene.The catalyst prepared by impregnation has the best catalytic performance,The catalyst prepared by ultrasonic-assisted has good catalytic stability.Under the same Au loading,Catalysts prepared in water solvent has a better performance.