Method for preparing rare-earth transition metal composite oxide porous hollow spheres

Abstract

The invention discloses a method for preparing rare-earth transition metal composite oxide porous hollow spheres and belongs to the field of inorganic nanometer materials and heterogeneous catalysis.The method comprises the following steps: 1, dissolving a rare-earth metal source and a transition metal source in a polyol medium, and synthesizing a solid spherical alkoxide precursor with excellentdispersion by adopting a solvothermal method; and 2, performing heat treatment on the precursor under specific conditions, and synthesizing the rare-earth transition metal composite oxide porous hollow spheres based on an unbalanced heat treatment method. The method disclosed by the invention has the advantages that the raw material price is low, the hollow structure material is directly obtained, and the prepared rare-earth transition metal composite oxide porous hollow spheres have the advantages of being uniform in metal element dispersion, controllable in composition and size, capable ofrealizing porous distribution of the shell layer and controllable in thickness; and when the hollow spheres are applied to a catalytic reaction, the contact area between the substrate molecule and catalytic active sites can be greatly enlarged, the interface synergy among different components of the rare-earth transition metal oxides contributes to transmission of reactive oxygen species at the heterogenous interface and transfer of electrons, and the activity of the catalytic oxidation reaction is obviously improved.

Description

technical field [0001] The invention relates to the field of inorganic nanometer materials and heterogeneous catalysis, in particular to a method for preparing rare earth-transition metal composite oxide porous hollow spheres. Background technique [0002] Transition metal oxides and rare earth metal oxides have become the focus of catalyst research due to their advantages of low price, high reducibility and good thermal stability. As a typical structure, hollow nanospheres are widely used in catalysis, separation, Adsorption and other fields have been widely used. [0003] At present, the synthesis methods of hollow structures mainly include hard template method, soft template method and self-template method. Hollow structural materials of different types and shapes can be prepared by using the hard template method, but it is difficult to remove the template, which leads to the collapse and damage of the product structure to a certain extent. Although the template is eas...

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Problems solved by technology

However, due to the high price of organic ligands, the limited types of MOF materials suitable for rare earth metals, and the complexity of the synthesis process, this synthesis method has great limitations in industrial applications.

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