纳米ZSM-5分子筛的合成及其催化转化甲醇性能

通过在常规的分子筛合成水热体系中加入适量NaCl，合成了纳米ZSM-5分子筛，采用XRD、SEM、N₂吸附和NH₃-TPD等方法对其结构进行表征，并评价在甲醇制丙烯反应中的催化性能。结果表明，合成的ZSM-5分子筛分散性良好，粒度分布均一，晶粒大小约为100 nm，与微米级ZSM-5分子筛相比，纳米ZSM-5分子筛催化剂具有更大的比表面积（402.0 m²·g^-1）和孔容（0.41 cm³·g^-1），在甲醇制丙烯催化反应中表现出更好的催化性能，丙烯选择性远高于微米级ZSM-5分子筛，且表现出很高的活性和稳定性，运行140 h，甲醇转化率仍大于90%。

Synthesis of nanocrystal ZSM-5 molecular sieves and their catalytic performance for methanol conversion

Nanocrystal ZSM-5 molecular sieves were synthesized by adding proper amount of sodium chloride into conventional hydrothermal system and characterized by means of XRD,SEM,nitrogen adsorption(BET) and NH3-TPD.Their catalytic performances for methanol-to-propylene reaction were evaluated.The results showed that compared with microcrystal ZSM-5 molecular sieves,nanocrystal ZSM-5 molecular sieves with crystal size about 100 nm possessed higher surface area(402.0 m2·g-1),larger pore volume(0.41 cm3·g-1),good dispersibility and uniform particle size distribution;nanocrystal ZSM-5 catalyst exhibited much higher activity and selectivity to propylene in methanol-to-propylene process,and the methanol conversion could maintain above 90% even after running for 140 h.