Beta/ZSM - 5 nano composite molecular sieves and preparation method thereof

A ZSM-5, nanocomposite technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of uneven distribution of Beta and ZSM-5 crystal phases, low degree of molecular sieve compounding, and preparation. Harsh conditions and other problems, to achieve the effects of controllable morphology and mesoporous structure, improved catalytic activity and selectivity, and simple preparation method

Inactive Publication Date: 2015-08-19
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical mixing technology is to mechanically mix Beta and ZSM-5 zeolite molecular sieve particles together (CN 102958610 A, CN 102909062 A). Adhesives can be used or not used in the process. Although this technology is simple in operation Easy to implement, but the distribution of Beta and ZSM-5 crystal phases in the prepared composite molecular sieve is uneven, and the degree of bonding is low; the attached crystal growth technology is based on Beta or ZSM-5 zeolite molecular sieve, and attached crystals grow outside the crystal Another zeolite molecular sieve (Chemistry of Materials 2006, 18, 4959-4966; Chinese Chemical Letters 2011, 22, 1103-1106; Microporous and Mesoporous Materials 2013, 169, 212-217), using this technology can obtain the core-shell structure Composite molecular sieves, but the technical process is relatively complicated, the preparation conditions are harsh, and the base molecular sieve particles are usually large, and the composite degree of the two molecular sieves is low
At present, there is no report on the preparation method that can realize the high composite of Beta and ZSM-5 molecular sieves on the nanometer scale.

Method used

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  • Beta/ZSM - 5 nano composite molecular sieves and preparation method thereof
  • Beta/ZSM - 5 nano composite molecular sieves and preparation method thereof
  • Beta/ZSM - 5 nano composite molecular sieves and preparation method thereof

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Embodiment 1

[0033] Taking mesoporous carbon with a three-dimensional ordered mesoporous structure as a hard template mesoporous carbon with a mesopore diameter of 40nm as an example, the method for preparing Beta / ZSM-5 nanocomposite molecular sieves is realized by the following steps:

[0034] (1) Weigh 0.05g of sodium hydroxide and dissolve it in 6.75g of tetraethylammonium hydroxide (abbreviation: (TEA) 2 (2, 35wt% aqueous solution), add 8.925g silica sol (containing 30wt% silica aqueous solution) dropwise, stir until the silica sol dissolves completely under room temperature conditions, add 0.185g aluminum isopropoxide (98wt%), wherein silica sol SiO 2 In terms of aluminum isopropoxide as Al 2 o3 Calculate, so that the molar ratio of each material is: SiO 2 :Al 2 o 3 : (TEA) 2 O: Na 2 O: H 2 O=25:0.25:9:0.35:330, stirring continuously at room temperature for 12 hours; filtering with a syringe filter with a filtration precision of 200 nm to obtain a clear Beta zeolite growth solu...

Embodiment 2

[0042] Taking mesoporous carbon with three-dimensional ordered mesoporous structure as hard template mesoporous carbon with mesoporous structure, the mesopore diameter is 20nm as an example, the method for preparing Beta / ZSM-5 nanocomposite molecular sieve is realized by the following steps:

[0043] (1) Weigh 0.05g sodium hydroxide and dissolve in 6.75g tetraethylammonium hydroxide (35wt% aqueous solution, called for short (TEA) 2 O); add 8.925g silica sol (containing 30wt% SiO 2 aqueous solution), stirring at room temperature until the silica sol is completely dissolved, adding 0.185g aluminum isopropoxide (98wt%), wherein the silica sol is made of SiO 2 In terms of aluminum isopropoxide as Al 2 o 3 Calculate, so that the molar ratio of each material is: SiO 2 :Al 2 o 3 : (TEA) 2 O: Na 2 O: H 2 O=25:0.25:9:0.15:330, stirring continuously at room temperature for 12 hours; filtering with a syringe filter with a filtration precision of 200 nm to obtain a clear Beta zeol...

Embodiment 3

[0051] Taking mesoporous carbon with a three-dimensional ordered mesoporous structure as a hard template mesoporous carbon with mesoporous structure, and the mesopore diameter is 10nm as an example, the method for preparing Beta / ZSM-5 nanocomposite molecular sieve is realized by the following steps:

[0052] (1) Weigh 0.05g of sodium hydroxide and dissolve it in 12.62g of tetraethylammonium hydroxide (abbreviation: (TEA) 2 (2, 35wt% aqueous solution), add 5g white carbon black, stir under room temperature until completely dissolving; Add 0.087g aluminum isopropoxide (98wt%), wherein white carbon black is SiO 2 In terms of aluminum isopropoxide as Al 2 o 3 Calculate, so that the molar ratio of each material is: SiO 2 :Al 2 o 3 : (TEA) 2 O: Na 2 O: H 2 O=20:0.1:7.2:0.3:110, stirring continuously for 10 hours at room temperature; filtering with a syringe filter with a filtration precision of 450 nm to obtain a clear Beta zeolite growth solution.

[0053] (2) Weigh 0.5g of...

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Abstract

The invention relates to a Beta/ZSM - 5 nano composite molecular sieves and preparation method thereof, which belongs to molecular sieve catalytic materials preparation area. The Beta/ZSM - 5 nano composite molecular sieves is a composite zeolite with medium and micro double holes and neat structure which is parallel arranged on nanoscale of beta zeolite and ZSM - 5 zeolite particles. The space of the parallel arrangement of beta zeolite and ZSM - 5 zeolite particles is medium hole. The Beta/ZSM - 5 nano composite molecular sieves is high in compound degree and good in crystallinity, and the micro hole passing path in unit volume is shortened. The mass transfer resistance of macromolecule catalytic reaction is reduced. The match of acid sites and micro hole structure of the two zeolites is realized. The catalytic activity and selectivity of the objective product is increased. The preparation method is easy. An ordered mesoporous carbon is used as hard template, and the removal of calcine is easy. The morphology and medium hole structure of the composite molecular sieves is controllable, the operation is convenient and the reproducibility is high.

Description

technical field [0001] The invention relates to a preparation method of molecular sieves, in particular to the preparation of Beta / ZSM-5 nanocomposite molecular sieves, and belongs to the field of preparation of molecular sieve catalyst materials. Background technique [0002] Zeolite molecular sieves are widely used in the field of catalysis due to their unique structure and performance. Its ordered and regular ~1nm micropores can realize the shape-selective sieving of molecules, and its strong acid activity can catalyze hydrocarbon cracking, isomerization and alkylation, etc. Carbon ion reaction, large specific surface area and high stability can strengthen the carrier function of zeolite molecular sieve. Up to now, zeolite molecular sieves have occupied nearly a quarter of the catalyst market in the world. [0003] There are many types of zeolite molecular sieves with different properties. Combining two or more zeolite molecular sieves can achieve the effects of adjustin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02C01B39/04B82Y30/00
Inventor 陈汇勇于莎王静徐龙马晓迅
Owner NORTHWEST UNIV(CN)
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