《Table 2 Textural properties of the catalysts》

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《ZSM-5/MAPO Composite Catalyst for Converting Methanol to Olefins in a Two-Stage Unit with a Dimethyl Ether Pre-Reactor》

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AL:Langmuir surface area；ABET:BET surface area；VT:total pore volume；VM:micropore volume；DAA:adsorption average pore diameter（4 V/A by BET）.

The textural properties of the catalyst samples are listed in Table 2.The composites showed higher specific surface area（BET and Langmuir surface area），total pore volume（VT），and average pore diameter（DAA）but lower micropore volume（VM）as compared with ZSM-5.This finding could be attributed to the destruction or overlay of some micropores in ZSM-5 during synthesis.Moreover，the average pore size significantly increased after P modification because of the production of mesopores after washing out of the amorphous species in the crystals and/or the dealumination during P modification.The generation of large pores would be beneficial to the mass transfer.