Catalyst with non-noble metal nanoclusters confined and stabilized in silicalite-1 molecular sieve pore channels, and preparation method and application thereof

Abstract

The invention discloses a catalyst with non-noble metal nanoclusters confined and stabilized in silicalite-1 molecular sieve pore channels, and a preparation method and an application thereof, and belongs to the technical field of molecular sieves. The molecular sieve loaded catalyst provided by the invention has a single nanoparticle with a shape of a hexagonal prism, a length of about 200 nm, awidth of about 200 nm and a thickness of about 100 nm. Non-noble metal nanoclusters contained in the molecular sieve pore channels of the catalyst provided by the invention have good dispersity whichis larger than 80%, comprise non-noble metal elements of Cu, Fe, Co, Ni and Ag, and have a particle size of 1 to 2 nm. The catalyst provided by the invention has ultrahigh single product selectivity in a solvent-free liquid-phase oxidation of toluene, and has good conversion efficiency compared with catalysts of a same kind. Meanwhile, the pore channel structure of the catalyst provided by the invention also has a certain selective redox function for aromatic compounds.

Description

technical field [0001] The invention belongs to the technical field of molecular sieves, and specifically relates to a synthesis method for confining and stabilizing non-noble metal nanoclusters in the pores of Silicalite-1 molecular sieves, a series of preparations of molecular sieve-loaded non-noble metal catalysts, and the use of such catalysts in toluene in a solvent-free liquid phase Applications in oxidation reactions or selective redox reactions of other aromatic compounds. Background technique [0002] In the oxidation reaction of toluene, the methyl group of toluene is not easy to be activated, and an initiator needs to be added to make it undergo a series of chemical reactions. However, the initiator contains toxic elements such as bromine, which limits the application environment of the product and generally has low economic value. At the same time, in the toluene oxidation reaction, a large amount of solvents are required to participate, such as acetic acid, ace...

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Problems solved by technology

However, the ZSM-5 molecular sieve framework contains aluminum atoms, and the acidity brought by aluminum atoms to the molecular sieve sometimes reduces the catalytic activity of metal nanoclusters, and the introduction of too many aluminum atoms also greatly reduces the structural stability of the molecular sieve itself.

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