The invention discloses a synthesis method of a small-
crystal-grain FER (
Ferrierite)
molecular sieve with a laminar stacking structure. The synthesis method comprises the following steps: taking a
silicon source, an aluminum source, alkali, an organic template agent and water as raw materials, and rotating and
ageing at relatively low temperature to form initial gel; then carrying out dynamic
crystallization to obtain a primary product; then removing the organic template agent under a mild condition by utilizing a lot of low-temperature plasmas generated through a
dielectric barrier
discharge(DBD) device, so as to obtain the small-
crystal-grain FER
molecular sieve with the laminar stacking structure; finally, carrying out different depths of water
stream coupled low-temperature
plasma treatment on the prepared
molecular sieve, so as to remove framework aluminum and adjust the acidic ratio of the FER molecular
sieve, and further modify the shape and structure of the molecular
sieve. The molecular
sieve prepared by the invention not only has good stability, but also has a very strong
carbon deposition resisting capability; when the molecular sieve is used for catalyzing n-
butene isomerization reaction, excellent performance is obtained, and the stability of a catalyst is effectively enhanced; the service life of the catalyst is extremely improved.