甲醇制芳烃催化剂失活特性研究进展

在系统分析甲醇制芳烃催化反应特性基础上,重点对影响催化剂长周期使用性能的失活原因及应对方案进行综述。催化剂失活是多因素共同影响的结果,主要包括可再生的积炭失活、可部分再生的分子筛骨架铝流失失活、及不可再生的活性金属迁移/聚并失活和杂质毒化失活。积炭导致的催化剂失活可通过调变ZSM-5的B酸强度、合成小晶粒ZSM-5分子筛及采用碱液预处理ZSM-5分子筛等方式减缓; ZSM-5分子筛骨架铝流失导致的催化剂失活可通过采用磷改性等方式降低;活性金属迁移导致的催化剂失活可通过引进稳定助剂、降低催化剂生产过程中铝的引入等方式解决;而杂质毒化导致的催化剂失活需要通过净化原料和反应体系的措施来避免。

Research advances on deactivation characteristics of aromatic catalysts for methanol-to-aromatics

Based on systematic analysis of catalytic reaction characteristics of methanol to aromatic hydrocarbons,reasons for the deactivation of long-term catalyst performance and corresponding solutions are reviewed.Catalyst deactivation is the result of multiple factors including renewable deactivation caused by carbon deposition,partly renewable deactivation caused by Al loss from molecular sieves framework,and non-renewable deactivation caused by active metal aggregation/reduction and impurities poison.Catalyst deactivation caused by carbon deposition could be mitigated by modifying strength of Bronsted acid of ZSM-5,synthesizing small-grain ZSM-5 molecular sieves and pretreating ZSM-5 molecular sieves with Alkali liquid.Catalyst deactivation caused by Al loss from molecular sieves framework can be reduced by phosphorus modification.Catalyst deactivation caused by active metal migration can be solved by introducing stable additives or reducing aluminum content during catalyst production.And catalyst deactivation caused by impurity poisoning needs to be avoided by purifying raw materials and reaction systems.