Abstract:

The catalysts with HgCl₂ supported on different carriers were prepared by impregnation methods and characterized by BET，AFS and EA method. The catalytic performance in acetylene hydrochlorination to vinyl chloride was studied in a packed bed reactor. The causes of catalyst deactivation were dicussed. The results showed that the catalysts with HgCl₂ supported on different carriers were greatly different in both catalytic performance and cause of deactivation. An asphaltene based carbon AC-2 carrier was the best one for the reaction. When HgCl₂ loading was 5%，under the optimal conditions：acetylene GHSV 36 h^－1，140 ℃，n(HCl) ∶n(C₂H₂)= 1.05～1.1，its initial conversion exceeded 99%（higher than activated carbon supported catalysts by 39%），and selectivity was close to 100%，its lifespan was up to 3168 h. The catalytic performance was superior to existing industrial high-mercury catalyst.

摘要：

采用等体积浸渍法制备了一系列不同载体的HgCl₂催化剂，利用BET、原子荧光光谱仪（AFS）、元素分析仪（EA）等对样品进行了表征，考察了催化剂在固定床反应装置上进行乙炔氢氯化反应的性能，同时对催化剂失活原因进行了初探。结果表明，不同载体催化剂催化性能和失活原因差异很大，其中以AC-2（沥青基球形炭）为载体的HgCl₂/AC-2催化性能最佳，当HgCl₂含量为5%（质量分数）、乙炔空速36 h^－1、温度140 ℃、n(HCl)∶n(C₂H₂)=1.05～1.1时，其初始转化率>99%（比HgCl₂/AC-1提高39%），选择性接近100%，寿命可达3168 h，催化性能优于现有工业高汞催化剂。