甲醇制烯烃催化剂失活模型

在固定床反应器中，研究了甲醇制烯烃反应中当SAPO-34分子筛处于失活期时催化剂活性的变化情况，主要考察催化剂活性随反应温度、空速和运行时间的变化，通过对实验数据的分析拟合，得到了催化剂活性与失活时间、反应温度、空速的经验关联式(失活模型)，对失活模型的检验表明，该模型与实验数据较为吻合，表明了该式的准确性。 通过对失活模型的分析，获得了当失活速率达到最大时的失活时间与反应时间、空速的关联式，失活过程应服从不均匀表面失活机理，并且当催化剂处于失活区时，失活时间对活性的影响要大于空速和温度。

Deactivation Model of the Catalyst Used in Methanol to Olefin Process

The change of activity of the SAPO-34 zeolite catalyst in the methanol to olefin process(MTO) was studied after the catalyst started to lose activity in the fixed-bed isothermal integral reactor. The effect of temperature, space speed and time on stream on the change of catalyst activity was investigated. The deactivation function showed a good agreement with the experimental data. By analyzing the deactivation function, the relations between time when the deactivation speed was fast and both temperature and space velocity were obtained. The deactivation process obeyed the deactivation mechanism on the inhomogeneous surface. After the SAPO-34 zeolite started to lose activity, the effect of deactivation time was greater than the effect of space speed and reaction temperature.