Bell type platinum-based magnetic space confinement catalyst and preparation method thereof

Abstract

The invention provides a bell type platinum-based magnetic space confinement catalyst. The bell type platinum-based magnetic space confinement catalyst is a platinum-based magnetic space confinement catalyst which is prepared by taking a Fe3O4 nanoparticle as a core, a thermo-crosslinking poly 3,4-ethylene dioxythiophene / platinum composite material as a hollow shell layer and dispersing and distributing small-sized platinum nanoparticles in the hollow shell layer structure. The preparation method of the catalyst mainly comprises the following steps: synchronously building poly 3,4-ethylene dioxythiophene / platinum composite shell layers on the surfaces of Fe3O4@SiO2 nanoparticles by utilizing redox reaction of a conductive polymer monomer 3,4-ethylene dioxythiophene and noble metal-derivedpotassium chloroplatinite to synthesize a three-layer core-shell structure platinum-based magnetic composite material, crosslinking poly 3,4-ethylene dioxythiophene chains through thermal treatment, and etching by strong base to remove a silicon dioxide middle shell layer to prepare the bell type platinum-based magnetic space confinement catalyst. The synthesis process is simplified, the agglomeration and loss phenomenon of the noble metal nanoparticles in the catalytic process is effectively avoided, the stability of the platinum nanoparticles in the catalytic process is reinforced, and highcatalytic activity is presented.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a catalyst and a preparation method thereof. Background technique [0002] Noble metal-based magnetically supported catalysts have both the high catalytic activity of noble metal nanoparticles and are easy to magnetically separate and recover, making them the most promising type of catalysts. Among them, the use of core-shell magnetic nanocarriers (with magnetic particles as the core and inorganic or organic materials as the shell) to directly anchor noble metal nanoparticles has become the focus of researchers' attention because of its simplicity and ease of use and the large number of exposed active sites. . However, during the catalytic process, the noble metal nanoparticles immobilized on the surface of the magnetic carrier will change their size, shape and structure due to their own high surface energy and the collision of the reaction substrate,...

AI Technical Summary

Problems solved by technology

However, the construction process of the outer porous protective shell increases the probability of agglomeration and loss of noble metal nanoparticles, while the continuous collision between the magnetic core and metal nanoparticles also increases the probability of agglomeration and loss of noble metal nanoparticles during the catalytic process, reducing the Its structural stability limits its large-scale industrial application.

Images