Ordered mesoporous high-entropy metal oxide and preparation method thereof

Abstract

The invention relates to an ordered mesoporous high-entropy metal oxide and a preparation method thereof. The aperture of the oxide is 2-50nm, the specific surface area is 50-1000m < 2 > / g, and the mesostructure is p6mm, Fm < 3 > m, Im3 m, Pm3 n, Fd < 3 > m or Ia3 d. The method comprises the following steps: (1) dissolving a surfactant, an aluminum source, a niobium source, a molybdenum source, a titanium source, a zirconium source, a catalyst and a coordination agent in an organic solvent to obtain a mixed solution; and (2) drying the obtained mixed solution to obtain a solid A, and then roasting the solid A to obtain a target product. According to the invention, the coordination agent and the catalyst are introduced together, so that different metal precursors have consistent hydrolysis-condensation rate; mesopores are introduced into the high-entropy oxide, so that the problem of insufficient exposure of active sites is solved. Compared with the prior art, different metal precursors can be effectively assembled with the surfactant, exposure of catalytic active sites can be enhanced, the synthesis method is high in controllability, and the pore diameter, the specific surface area and the mesostructure of the obtained material are adjustable.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and relates to an ordered mesoporous high-entropy metal oxide and a preparation method thereof. Background technique [0002] Transition metal oxides, as a class of low-cost and abundant resources, have been widely used in various catalytic processes. Compared with single metal oxides, the synergy between multiple types of catalytic active sites in complex metal oxides enables them to exhibit higher catalytic activity. Therefore, the rational design of transition metal oxide catalysts with multiple catalytic sites is of great significance in the field of catalysis. [0003] In recent years, high-entropy oxides, which are formed by randomly distributing five or more approximately equimolar metal elements in a single-phase lattice, have gained more and more attention due to their diversity in element composition and excellent chemical and thermal stability. more attent...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an ordered mesoporous high-entropy metal oxide and its preparation method to overcome the difficulties in the prior art that different metal precursors are difficult to effectively assemble with surfactants or the active sites of traditional micron-level high-entropy oxides Defects such as insufficient point exposure

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