AuCl3-BiCl3/C催化剂的制备及使用性能研究

摘要

Using AuCl3as active component,BiCl3 as additive and active carbon as carrier,AuCl3-BiCl3/C catalysts were prepared by impregnation method and were characterized by BET,XRD and TEM.The catalytic performance and selectivity to VCM were investigated in a fixed bed reactor.The results showed that adding BiCl3 is beneficial to enhancing the performance and inhibiting coke deposition during the reaction.Among catalysts prepared,the 0.3 ％ AuCl3-0.9 ％ BiCl3/C catalyst is the best one.The active components are highly dispersed on the surface of the carrier.Under the reaction conditions of C2 H2 hourly space velocity of 20 h-1,feed volume ratio V(HCl)/V(C2 H 2)=1 ∶ 1.1,the conversion of acetylene is up to 98.9％,the selectivity to VCM is up to 99.7％ after test for 24 h.%以AuCl3为主催化活性组分,BiCl3为助剂,活性炭为载体,采用浸渍法制备AuCl3-BiCl3/C催化剂,使用固定床反应器对催化剂在乙炔氢氯化反应中的催化活性(用乙炔转化率和氯乙烯选择性作为评价指标)进行评价,并采用BET,XRD,TEM方法进行了表征.结果表明:BiCl3的加入能提高乙炔转化率,0.3％AuCl3-0.9％BiCl3/C为最佳配比,活性组分分散度高,抗积炭能力好,在乙炔空速为20 h-1、V (C2H2)/V (HCl)=1∶1.1、反应时间为24 h的条件下,乙炔转化率可达到98.9％,氯乙烯选择性高于99.7％,催化剂使用性能较好.