Method for preparing ZSM-48 molecular sieve with low silica-alumina ratio by seed crystal method and application of molecular sieve

The invention discloses a method for preparing a ZSM-48 molecular sieve with a low silica-alumina ratio by a seed crystal method and application of the molecular sieve.The preparation method comprises the steps that an aluminum source, sodium hydroxide and a structure-directing agent are added into deionized water and stirred to be dissolved, then a seed crystal is added, a silicon source is dropwise added after the seed crystal is dissolved, the mixture is stirred for a period of time and then placed in a reaction kettle to be heated and crystallized, and the ZSM-48 molecular sieve with the low silica-alumina ratio is obtained; and after the treatment is completed, naturally cooling to room temperature, carrying out centrifugal separation, collecting lower-layer solids, washing to be neutral, and drying to obtain the ZSM-48 molecular sieve. According to the method provided by the invention, the ZSM-48 molecular sieve with good particle morphology, relatively high crystallinity and a silica-alumina ratio of 5