The guiding role of pre-coking on the coke deposition over ZSM-5 in methanol to propylene.

For pre-coked samples (1M-W and 5M-W) prepared with abundant water at high temperature (480°C), an increasing trend of mesopore volume can be seen as the water concentration increased, suggesting the dealumination effect of steam on the catalysts, while the effect of coke on blocking the micropores can be observed, as the reduction trend of micropore volume did not follow the steam content.

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