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Method for synthesizing zeolite crystals with other structures by utilizing the template effect of zsm‑57 zeolite seed crystals

A ZSM-57, zeolite crystal technology, applied in the field of molecular sieve preparation, can solve the problems of high toxicity of organic template agent, high cost of zeolite, large amount of waste gas, etc., and achieve shortened crystallization time, good crystallinity and purity, no pollution. Effect

Active Publication Date: 2018-02-27
淮安六元环新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of organic templates has many disadvantages, such as the high cost of synthetic zeolite, high toxicity of organic templates, a large amount of waste discharge, and a large amount of waste gas generated by roasting organic templates.

Method used

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  • Method for synthesizing zeolite crystals with other structures by utilizing the template effect of zsm‑57 zeolite seed crystals
  • Method for synthesizing zeolite crystals with other structures by utilizing the template effect of zsm‑57 zeolite seed crystals
  • Method for synthesizing zeolite crystals with other structures by utilizing the template effect of zsm‑57 zeolite seed crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Synthesis of FER zeolite molecular sieve with ZSM-57 zeolite as seed crystal

[0027] First, the 8.12gH 2 O mixed with 0.06g sodium metaaluminate evenly, then added 0.35g NaOH, then added 3.32g silica sol with a silica content of 30.5% under stirring, continued stirring until the solution became uniform, then added 5% ZSM-57 Molecular sieves are used as seed crystals (the amount of seed crystals is based on the input SiO 2 mass percent calculation). The reaction raw materials were transferred to a polytetrafluoroethylene stainless steel reaction kettle, and statically crystallized at 160°C for 12 hours; after complete crystallization, the product was suction filtered and dried to obtain the product.

[0028] SiO 2 :Al 2 o 3 :Na 2 O:H 2 The molar ratio of O is 1:0.03:0.27:35, and the mass ratio of the seed crystal to the silicon source is 5%.

[0029] Through X-ray diffraction analysis, its structure is FER zeolite molecular sieve, and it can be seen f...

Embodiment 2

[0030] Example 2: Using ZSM-57 zeolite as the seed crystal to synthesize MTT and TON symbiotic phase zeolite molecular sieve

[0031] First, the 8.12gH 2 O and 0.056g of aluminum sulfate are mixed evenly, and then 0.35g of NaOH is added to it, and then 3.32g of silica sol with a silicon dioxide content of 30.5% is added under stirring, and the stirring is continued until the solution becomes uniform, and 5% ZSM-57 molecular sieve is added to make Seed crystal (the amount of seed crystal is represented by input SiO 2 mass percent calculation). Put the reaction raw materials into a polytetrafluoroethylene stainless steel reaction kettle, statically crystallize at 160°C for 24 hours to complete the crystallization, filter the product with suction, and dry it to obtain the product.

[0032] SiO 2 : Al 2 o 3 :Na 2 O:H 2 The molar ratio of O is 1:0.005:0.27:35, and the mass ratio of the seed crystal to the silicon source is 5%.

[0033] According to X-ray diffraction analysi...

Embodiment 3

[0034] Example 3: Using ZSM-57 zeolite as the seed crystal to synthesize MTT and FER symbiotic phase zeolite molecular sieves

[0035] First, the 8.12gH 2 O and 0.092g of aluminum sulfate are mixed evenly, then 0.35g of NaOH is added to it, and then 3.32g of silica sol with a silica content of 30.5% is added under stirring, and the stirring is continued until the solution becomes uniform, and then 5% ZSM-57 molecular sieve is added to make Seed crystal (the amount of seed crystal is represented by input SiO 2 mass percent calculation). Put the reaction raw materials into a polytetrafluoroethylene stainless steel reaction kettle, statically crystallize at 160°C for 24 hours to complete the crystallization, filter the product with suction, and dry it to obtain the product.

[0036] SiO 2 :Al 2 o 3 :Na 2 O:H 2 The molar ratio of O is 1:0.0083:0.27:35, and the mass ratio of the seed crystal to the silicon source is 5%.

[0037] According to X-ray diffraction analysis, its ...

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Abstract

The invention relates to a molecular sieve preparation method, and aims to provide a method for utilizing the template effect of a ZSM-57 zeolite crystal seed to synthesize zeolite crystals with other structures. The method comprises the following steps of after uniformly mixing deionized water and an aluminum source, adding NaOH into the mixture; then adding a silicon source while stirring, and continuously stirring until the solution forms silica-alumina gel; adding the ZSM-57 molecular sieve crystal seed into the silica-alumina gel, stirring and putting in a reaction kettle, and carrying out a crystallization reaction; extracting, filtering and drying a product to obtain a finished product. According to the method provided by the invention, an FER, MTT and TON coexisting phase or MTT and FER coexisting phase zeolite molecular sieve with high crystallinity synthesized by a crystal seed method keeps favorable crystallinity and purity, and has favorable catalytic reaction activity. Compared with the prior art, the crystallization time is greatly shortened, and unnecessary loss during the production process is reduced. An organic template reagent is not used during the reaction process, and an inorganic raw material adopted is friendly to the environment, free of pollution, and lower in cost.

Description

technical field [0001] The invention belongs to a method for preparing molecular sieves, in particular to a method for synthesizing zeolite crystals with other structures by utilizing the template effect of ZSM-57 zeolite seed crystals. Background technique [0002] In the synthesis of modern zeolite molecular sieves, organic templates play an important role in their synthesis. Various organic templates such as organic amines, alcohols, phosphines, sulfur, etc. were used to synthesize zeolites. However, the use of organic templates has many disadvantages, such as high cost of synthetic zeolite, high toxicity of organic templates, large amount of waste discharge, and large amount of waste gas generated by roasting organic templates. In zeolite synthesis, the synthesis of zeolites without using organic templates has become a very important issue. [0003] Recently, Xiao Fengshou et al. developed an organic template-free seeding method to synthesize zeolites. In the whole sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
CPCC01B39/02C01P2002/72C01P2004/03
Inventor 朱龙凤吴勤明朱杰曹雪波李以名胡万鹏
Owner 淮安六元环新材料有限公司
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