ZSM-5 TYPE MOLECULAR SIEVE SYNTHESIS METHOD

摘要

The present invention pertains to the field of molecular sieve synthesis, and relates to a synthesis method of ZSM-5 type molecular sieves. In this method, natural minerals, i.e., natural kaolin and natural diatomite, are used as the total silicon source and aluminum source required for the molecular sieve synthesis, and these two natural minerals are calcinated and subjected to acidic (alkaline) treatment before they are mixed at a certain ratio, and then crystallized under hydrothermal conditions to obtain the product, a ZSM-5 type molecular sieve. The ZSM-5 type molecular sieve obtained by the method according to the present invention is a hierarchical porous material having a crystallinity of 70% to 120% as compared to conventional ZSM-5 type molecular sieves synthesized by using pure chemical reagents, and the silica-to-alumina ratio in the molecular sieve product may be adjusted by varying the ratio of the two minerals in the raw materials for the synthesis. According to the present invention, the range of raw materials for the preparation of molecular sieve materials is broadened, and therefore not only the cost for the molecular sieve production is greatly reduced but also the greenness in the production process of the molecular sieve material is significantly improved.

主权项

1. The A synthesis method of ZSM-5 type molecular sieves, characterized in that, natural minerals are used as the total silicon source and aluminum source needed for the molecular sieve synthesis, and hydrothermally crystallized to produce the ZSM-5 type molecular sieves, wherein said natural minerals are a mixture of natural minerals having a low silica-to-alumina ratio together with natural minerals having a high silica-to-alumina ratio or with pure silicon.