Abstract: 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.

Abstract: The present invention relates to a synthesis method of zeolite 4A, wherein natural clay mineral, provided as the total silicon source and aluminum source required for molecular sieve synthesis, is activated before they are crystallized under hydrothermal conditions to synthesize zeolite 4A. In the method of the present invention, a simple process is employed and inexpensive raw materials are used, resulting in zeolite 4A having a whiteness of 90% or more and a calcium ion exchange capacity of no less than 310 mg CaCO3/g zeolite. 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 molecular sieve production is greatly reduced by using the sub-molten salt activation method, but also the greenness in the production process of molecular sieve materials is significantly improved.

Abstract: 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.