Sn-Bi-Co@AC催化剂在乙炔氢氯化反应中的应用

The Application of Sn-Bi-Co@AC Catalysts for Acetylene Hydrochlorination

以活性炭为载体,SnCl_4为活性组分,添加不同含量的BiCl_3以及CoCl_3,制备出了Sn@AC、Sn-Bi@AC、Sn-Bi-Co@AC系列乙炔氢氯化催化剂。运用XRD、物理吸附仪对催化剂微观结构进行了表征,并在常压固定床反应器上进行了乙炔氢氯化反应性能评价。研究发现,浸渍法合成的Sn-Bi-Co@AC催化剂中,SnCl_4负载量为10%,BiCl_3负载量为5%,CoCl3负载量为10%时,催化剂性能最优,乙炔转化率和氯乙烯的选择性可分别维持在90%和95%以上长达100h。通过对比三组催化剂失活前后织构性质数据的变化,发现Sn-Bi-Co@AC复合催化剂在失活后比表面积和孔容变化最小,这表明BiCl_3和CoCl_3的加入可以有效降低反应过程中催化剂表面积碳的产生,从而提高了催化剂的寿命。

Using active carbon as carrier,SnCl_4-based non-mercury catalysts,including Sn@AC,Sn-Bi@AC,Sn-Bi-Co@AC,were synthesized by adding different content of BiCl_3 and CoCl_3. The catalysts were evaluated in acetylene hydrochlorination atmospheric fixed bed reactor.The results showed that the catalytic properties of synthetic three-component catalysts were optimal on the proportion of 10% SnCl_4,5% BiCl_3 and 10% CoCl_3.Acetylene＇s conversion rate was more than 90% and the selectivity of vinyl chloride was around 95% within the reaction time of 100 h.Through the XRD and physical adsorption instrument,catalyst microstructures were characterized.Coconut shell activated carbon＇s specific surface area and pore size was significant increased after nitric acid treatment;adding component BiCl_3 and CoCl_3 could make the coke phenomenon on catalytic surface weakened.