乙炔氢氯化反应制备氯乙烯低固汞催化剂失活机理

摘要

The fresh and deactivated low-mercury catalysts were characterized by low-temperature nitrogen adsorption-desorption technique, scanning electron microscopy(SEM), temperature programmed desorption- mass spectrometry(TPD-MS), temperature programmed oxidation-mass spectrometry(TPO-MS) and thermal gravimetric analysis(TG). The results showed that HgCl2 of deactivated catalyst lost by 1.6%, deposited carbon reached 13.5% and sulfocompounds were detected. The coking and sulfur poisoning were the main reasons for the new low-mercury catalyst.%采用氮气吸附脱附技术、扫描电镜(SEM)、程序升温脱附-质谱联用(TPD-MS)、程序升温氧化-质谱联用(TPO-MS)和热重分析仪(TG)等对新鲜及反应800 h后的乙炔氢氯化低固汞催化剂进行了表征及失活机理分析.结果表明,反应后的低固汞催化剂的HgCl2的流失仅为1.6%,积炭量为13.5%,并测得含硫化合物,说明硫中毒和积炭是催化剂失活的主要原因.