二甲醚羰基化催化剂的烧炭再生

摘要

The H-MOR zeolite catalysts were prepared by hydrothermal synthesis. An inactivated catalyst which was used in dimthyl ether carbonylaiton was regenerated. The effects of gas, coke-burning temperature, O2 volume fraction and heating rate on the coke-burning process were investigated. The results of TPO and XRD analysis showed that there was different property coke on the inactivated catalyst. In the optimum conditions for the coke-burning of the inactivated catalyst, temperature 550℃, heating rate of 2℃·min?1 and O2 volume fraction of 3%,the catalyst activity was almost completely restored. The fresh and regenerated catalysts were characterized by means of NH3-TPD and N2 adsorption-desorption. The results showed that the coke was removed cleanly and channels were protected in the optimum condition.%以水热合成的H-MOR分子筛催化剂,通过对二甲醚羰基化反应失活后催化剂进行再生,考察了不同再生气体、再生温度、O2体积分数、烧炭升温速率等条件,烧炭后催化剂上二甲醚羰基化活性性能.TPO表征结果表明:反应后H-MOR分子筛上有两种不同性质的积炭.积炭催化剂在3%(体积)O2/N2气氛中,从室温以2℃·min?1升温至320℃恒温一段时间,然后以相同速率升温至550℃进行烧炭,再生催化剂活性几乎完全恢复.NH3-TPD和BET表征结果表明,再生催化剂活性得以恢复是因为优化了烧炭方案,分子筛表面积炭能够被烧除干净同时分子筛孔道不被破坏.