ZSM-35 molecular sieve and Me-ZSM-35 synthesis methods

A technology of ZSM-35 and synthesis method, which is applied in the direction of molecular sieve catalyst, chemical instrument and method, iron-conglomerate crystalline aluminum silicate zeolite, etc., can solve the problems of long reaction time, increase of synthesis cost, and increase of synthesis cost, and achieve The effect of large specific surface area and stability, reduced production energy consumption, and shortened crystallization time

Active Publication Date: 2015-02-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

These templates are not only expensive, which increases the cost of synthesis, but also produce a large amount of waste liquid and toxic gas during the synthesis and removal of templates
In order to avoid the use of organic templates, Jens Weitkamp reported the synthesis of FER molecular sieves without organic templates in the presence of potassium ions in 2002. The reaction conditions were 180°C rotary crystallization for 6 days. The disadvantage of this method is that the reaction time is longer, and potassium The use of ions will also increase the synthesis cost [Chem.Eng.Techonl., 2002, 25, 273]

Method used

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  • ZSM-35 molecular sieve and Me-ZSM-35 synthesis methods

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Experimental program
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Effect test

Embodiment 1

[0038] Synthesis of ZSM-35 Molecular Sieve Using MCM-22 as Isomorphic Seed

[0039] First 0.10g of sodium metaaluminate was dissolved in deionized water, then 0.28g of sodium hydroxide was added thereto, and after a clear solution was formed, 5.62g of silica sol (SiO 2 Content is 28.5%), continue stirring at room temperature until forming a uniform silica-alumina gel, finally add 0.08g (for adding SiO 2 5% of the mass) MCM-22 molecular sieve and stir evenly; transfer the mixed raw materials to a stainless steel reactor with a polytetrafluoroethylene lining, and dynamically crystallize at 160 ° C for 12 hours. The molar ratio of the reaction raw materials is as follows: 45SiO 2 : 2.0NaAlO 2 : 11.8NaOH: 1035H 2O, the product was suction filtered and dried to obtain ZSM-35 molecular sieve, and the synthesis yield of the product was 86 wt%.

[0040] figure 1 It is the XRD pattern of the sample, it can be seen that the sample has a typical ZSM-35 zeolite molecular sieve structu...

Embodiment 2-18

[0045] The specific batching ratio and crystallization conditions are shown in Table 1, and the specific batching process is the same as in Example 1.

[0046] The synthetic samples were analyzed by XRD, and the data results were compared with figure 1 Close, that is, the diffraction peak position and shape are the same, and the relative peak intensity fluctuates in the range of ± 5% according to the change of synthesis conditions, indicating that the synthesized product has the characteristics of ZSM-35 structure, and the yield of the product is above 80wt%.

Embodiment 19

[0048] First 0.10g of sodium metaaluminate was dissolved in deionized water, then 0.28g of sodium hydroxide was added thereto, and after a clear solution was formed, 5.62g of silica sol (SiO 2 content is 28.5%), continue to stir at room temperature until a uniform silica-alumina gel is formed, then add 0.08g (for adding SiO 2 5% of the mass) MCM-49 molecular sieve and stir evenly; finally add 0.14g Fe(NO 3 ) 3 9H 2 The aqueous solution of O is stirred evenly, and the mixed raw materials are transferred to a stainless steel reactor with a polytetrafluoroethylene lining, and the dynamic crystallization is performed at 160°C for 20h. The molar ratio of the reaction raw materials is as follows: 45SiO 2 : 2.0NaAlO 2 : 11.8NaOH: 1035H 2 O:0.3Fe 2 o 3 , the product is suction filtered and dried to obtain Fe-ZSM-35 molecular sieve, the XRD spectrum is as follows image 3 Shown, the synthetic yield of product is 84wt%.

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Abstract

The invention relates to ZSM-35 and Me-ZSM-35 molecular sieve synthesis methods; and the synthesis methods are characterized in that, MCM-22 and / or MCM-49molecular sieve are / is used as a seed crystal for hydro-thermal synthesis of ZSM-35 and Me-ZSM-35 molecular sieves under alkaline conditions without use of an organic template agent.

Description

technical field [0001] The invention relates to a ZSM-35 molecular sieve and a synthesis method of Me-ZSM-35. The invention also relates to an acid-catalyzed reaction catalyst of ZSM-35 and Me-ZSM-35 molecular sieve synthesized by the above method. Background technique [0002] Due to their specific pore structure and uniform pore size, porous materials are widely used in many fields such as adsorption, separation, ion exchange and catalysis. ZSM-35 molecular sieve is a layered molecular sieve material with FER characteristic topological structure, which belongs to the orthorhombic crystal system, in which the size of the eight-membered ring channel parallel to the [010] plane is 0.35*0.48nm; the channel parallel to the [001] plane The channel size of the ten-membered ring is 0.42*0.54nm, and it has a two-dimensional intersecting channel system that vertically divides the six-membered ring. The FER cage is a 0.6-0.7nm spherical cage formed by the intersection of the eight-m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/44B01J29/68
CPCB01J29/65B01J29/68C01B39/44C01P2002/72C01P2004/03
Inventor 王林英田鹏刘中民杨淼张莹杨虹熠袁扬扬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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