乙炔氢氯化制氯乙烯反应中水蒸汽对铜铋催化剂活性组分的稳定作用

Stabilizing Function of Water Steam for Reactive Components in the Regeneration Process of Cu-Bi Bimetallic Catalyst Used in Synthesis of Vinyl Chloride

通过引入水蒸汽改进乙炔氢氯化反应中铜铋催化剂的再生性能,将催化剂多次循环反应评价其稳定性.结果表明,与传统的空气再生法6h循环再生造成近95%以上催化剂活性组分流失相比,引入水蒸汽可将催化剂表面在反应过程中形成的易升华的BiCl3转化为具有很好热稳定性的BiPO4,提高了催化剂的稳定性,经15h循环再生后活性组分Bi仅损失20%,且可保持初始反应活性,使催化剂的工业化成为可能.

Addition of water steam into regeneration process was applied to enhance the performance of Cu-Bi catalyst in the reaction of acetylene hydrochlorination, and the stability of the catalyst was tested by multiple reaction-regeneration cycles. The results showed that compared with traditional regeneration method by air only which could lead 95% loss of reactive components in just 6 h regeneration cycles, the process involving water steam could transform bismuth chloride formed on the catalyst surface in the reaction process into bismuth phosphate which possesses excellent thermal stability. After 15 h regeneration cycles, only 20% Bi was lost, and the initial reactivity of the catalyst could still be recovered, which can make its industrial application possible.