Hollow metal organic framework capsule material for coating homogeneous catalyst as well as preparation method and application thereof

Abstract

The invention provides a hollow metal organic framework capsule material for coating a homogeneous catalyst. The hollow metal organic framework capsule material comprises a hollow inorganic template;a homogeneous catalyst dispersed in the hollow inorganic template; and a metal organic framework shell layer covering the surface of the hollow inorganic template. The metal organic framework materialconfinement homogeneous catalyst with a hollow structure is utilized, the large cavity can contain more guest molecules and avoid mass transfer resistance and the like caused by the fact that the guest molecules block pore channels, and a homogeneous catalysis environment can be simulated to maintain the activity and selectivity of original active guest molecules to the maximum extent. In addition, the metal organic framework shell layer also endows the guest molecular catalyst with specific properties of a metal organic framework material, including a substrate enrichment function, a size selectivity catalysis function and a host-guest synergistic catalysis function.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a hollow metal-organic framework capsule material for coating a homogeneous catalyst, a preparation method and application thereof. Background technique [0002] How to solve the problems of difficult recovery of soluble catalysts / homogeneous catalysts and easy polymerization deactivation has received more and more attention. Using porous materials to confine homogeneous catalysts to make them heterogeneous is a promising strategy. This requires a porous material with a large pore space to accommodate the guest molecule catalyst; but small openings inhibit the loss of the guest molecule, and at the same time allow the catalytic substrate / product to freely enter and exit the porous material, thereby realizing a heterogeneous homogeneous catalyst without It affects the contact between the guest and the substrate of the homogeneous catalyst and the mass transfer p...

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Problems solved by technology

[0003] The prior art discloses various methods for coating homogeneous catalysts, such as direct embedding of homogeneous molecular catalysts in the intrinsic pores of metal-organic frameworks , this method is to directly confine the guest molecules in the narrow pores of the metal-organic framework. The narrow pore space brings significant mass transfer resistance to the catalytic process, and even leads to distortion of the molecular guest, etc., which in turn leads to the final composite catalyst. Molecular catalysts with far less activity and selectivity than homogeneous ones

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