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Metal-coated MFI hierarchical pore structure packaging catalyst and packaging method and application thereof

A catalyst and multi-stage pore technology, which is applied in the direction of catalysts, molecular sieve catalysts, carbon compound catalysts, etc., can solve the problems of non-reduced crystallinity of molecular sieve matrix, uneven distribution of metal nanoparticles, uneven particle size, etc., and achieve rapid preparation methods. Simple, no reduction in crystallinity, and uniform particle size

Pending Publication Date: 2020-07-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a metal@MFI encapsulated catalyst with a hierarchical porous structure and its encapsulation method and application. The pore structure of the encapsulated catalyst contains micropores and mesopores, and the N of the encapsulated catalyst 2 Adsorption-desorption curve at relative pressure p / p 0 =0.1~1.0 There is an adsorption-desorption hysteresis loop, and the particle size of the metal nanoparticles in the encapsulated catalyst is 1-10nm; in the preparation process of the encapsulated catalyst, in the modification process of the MFI structure molecular sieve, the metal nanoparticles can be realized in one step Encapsulation and pore expansion of molecular sieves with MFI structure, and the crystallinity of the molecular sieve matrix does not decrease during the preparation process, which solves the problem of uneven distribution of metal nanoparticles in the catalyst prepared by the traditional wet impregnation method, uneven particle size, large particles, and easy Problems with migration, agglomeration and loss; meanwhile, pore expansion treatment maintains high molecular sieve crystallinity and significantly improves diffusion performance

Method used

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  • Metal-coated MFI hierarchical pore structure packaging catalyst and packaging method and application thereof
  • Metal-coated MFI hierarchical pore structure packaging catalyst and packaging method and application thereof
  • Metal-coated MFI hierarchical pore structure packaging catalyst and packaging method and application thereof

Examples

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Embodiment 1

[0078] The preparation method of the encapsulated catalyst of the Ni@ZSM-5-200 hierarchical porous structure described in this example includes the following steps:

[0079] (1) Ni-ethylenediamine complex solution, SiO with MFI structure 2 / Al 2 o 3 =200 ZSM-5 molecular sieves, tetrapropylammonium hydroxide and deionized water mix uniformly to obtain a mixed solution, wherein the mass ratio of Ni, ZSM-5 molecular sieves and deionized water is 0.04:1:2;

[0080] (2) Transfer the mixed liquid obtained in step (1) into a crystallization kettle and crystallize at 170°C for 12 hours, take it out, filter it, dry it, roast it at 500°C for 5 hours, and reduce it under a hydrogen atmosphere at 500°C for 4 hours to obtain Ni@ The encapsulated catalyst of ZSM-5-200 hierarchical pore structure is named A-1.

[0081] The XRD of the catalyst obtained in this embodiment is as follows: figure 1 Shown: by figure 1 The characteristic diffraction peaks of the MFI structure can be observed, ...

Embodiment 2

[0100] The preparation method of the encapsulated catalyst of Ni@Silicalite-1 hierarchical porous structure described in this embodiment comprises the following steps:

[0101] (1) Ni-ethylenediamine complex solution, pure silicon Silicalite-1 molecular sieve with MFI structure, tetrapropyl ammonium hydroxide and deionized water are mixed uniformly to obtain a mixture, wherein, Ni, pure silicon Silicalite-1 molecular sieve The mass ratio to deionized water is 0.04:1:2;

[0102] (2) Transfer the mixture obtained in step (1) into a crystallization kettle for crystallization treatment at 170°C for 12 hours, take it out, filter, dry, roast at 500°C for 5 hours, and reduce it in a hydrogen atmosphere at 500°C for 8 hours to obtain Ni@ The encapsulated catalyst of Silicalite-1 hierarchical pore structure is named A-2.

[0103] In the X-ray diffraction analysis results of the catalyst obtained in this embodiment, the characteristic diffraction peak of the MFI structure was observed,...

Embodiment 3

[0109] The preparation method of the encapsulated catalyst of the Ni@ZSM-5-200 hierarchical porous structure described in this example includes the following steps:

[0110] (1) Ni-ethylenediamine complex solution, SiO with MFI structure 2 / Al 2 o 3 =200 ZSM-5 molecular sieves, tetrapropyl ammonium hydroxide and deionized water mix uniformly to obtain a mixture, wherein the mass ratio of Ni, ZSM-5 molecular sieves and deionized water is 0.02:1:2;

[0111] (2) Transfer the mixture obtained in step (1) into a crystallization kettle, crystallize at 170°C for 12 hours, take it out, filter, dry, roast at 500°C for 5 hours, and reduce it in a hydrogen atmosphere at 500°C for 8 hours to obtain Ni@ ZSM-5-200 encapsulated catalyst with hierarchical pore structure, named A-3.

[0112] The characteristic diffraction peak of MFI structure is observed in the X-ray diffraction pattern of the catalyst obtained in this embodiment, but there is no diffraction peak of metal Ni particles, and...

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Abstract

The invention relates to a metal-coated MFI hierarchical pore structure packaging catalyst and a packaging method and application thereof. Micropores and mesopores are contained in the pore channel structure of the packaging catalyst, the N2 adsorption-desorption curve of the packaging catalyst has an adsorption-desorption hysteresis loop under the condition that the relative pressure p / p0 is 0.1-1.0, and the particle size of metal nanoparticles in the packaging catalyst is 1-10 nm. In the preparation process of the packaging catalyst, the MFI structure molecular sieve is modified, the packaging of the metal nanoparticles and the reaming of the MFI structure molecular sieve are realized in one step, and the crystallinity of the molecular sieve parent is not reduced in the preparation process so that the problems of non-uniform distribution, non-uniform particle size, large particles and easiness in migration, agglomeration and loss of the metal nanoparticles in the catalyst prepared bythe traditional wet impregnation method are solved; meanwhile, high molecular sieve crystallinity is maintained through broaching treatment, and the diffusion performance is remarkably improved.

Description

technical field [0001] The invention belongs to the field of catalytic materials, and relates to an encapsulated catalyst with a metal@MFI multi-level pore structure, an encapsulation method and an application thereof. Background technique [0002] In recent years, combining the advantages of metal properties and zeolite channel shape selection, the development of metal / zeolite catalysts has become a research hotspot, and it is of great significance to apply to important reactions such as biomass catalytic conversion, phenol catalytic deoxidation, and catalytic reforming. According to prior art reports, metal / molecular sieve catalysts are prepared by impregnation method, deposition method and ion exchange method, which may easily cause problems such as uneven dispersion of metal particles on molecular sieves, uneven particle size, easy agglomeration and loss, resulting in poor stability of the catalyst . Molecular sieve modification is mostly treated with inorganic alkali (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J29/40B01J29/46B01J35/02C07C1/20C07C1/22C07C15/04C10G3/00B01J35/00
CPCB01J29/46B01J29/405B01J29/0333C07C1/20C07C1/22C10G3/45C10G3/44B01J2229/186C07C2529/03C07C2529/40C07C2529/46C10G2400/02C10G2400/04C10G2400/30B01J2229/14B01J35/40C07C15/04Y02P20/52Y02P30/20
Inventor 石艳春曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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