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

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 (...

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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

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