Metallic oxide catalyst with high stability performance and preparation thereof

Abstract

The invention provides a metallic oxide catalyst with high stability performance and a preparation method thereof. The method comprises the following steps: S1, preparing a precursor water solution by dissolving potassium permanganate and transition metal nitrate in water, wherein the concentration of the potassium permanganate is 5-20 mmol, the concentration of the transition metal nitrate is 10-50 mmol, and the transition metal is chosen from titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zirconium, zinc and molybdenum; S2, pouring the solution into a hydrothermal reactor, heating to 70-90 DEG C, and stirring continuously to precipitating precipitate from the solution; S3, filtering and collecting the precipitate and washing; S4, preparing a lanthanide series metal nitrate solution, wherein the concentration of a lanthanide series metal nitrate precursor is 1-10 mmol; S5, collecting precipitate of the lanthanide series metal nitrate precursor and performing high-temperature calcination.

Description

technical field [0001] The invention relates to a metal oxide catalyst with high stability and a preparation method thereof. Background technique [0002] At present, the active components of metal oxide catalysts are mainly composed of transition metal oxides. In order for the catalyst to have higher catalytic activity and longer service life, the existing technical means mainly include: (1) increasing the number of active sites of the catalyst itself, To offset the performance degradation caused by the collapse of the catalyst structure during the high-temperature sintering process, this process requires the control of the catalyst’s morphology, structure and particle size to maximize the catalyst’s intended service life. catalytic performance, but the specific surface area is also limited, and the preparation process cannot guarantee an unlimited increase in the specific surface area of ​​the catalyst; (2) metal oxides with a stable crystal structure are used as catalyst ...

AI Technical Summary

Problems solved by technology

[0002] At present, the active components of metal oxide catalysts are mainly composed of transition metal oxides. In order for the catalyst to have higher catalytic activity and longer service life, the existing technical means mainly include: (1) increasing the number of active sites of the catalyst itself, To offset the performance degradation caused by the collapse of the catalyst structure during the high-temperature sintering process, this process requires the control of the catalyst’s morphology, structure and particle size to maximize the catalyst’s intended service life. Catalytic performance, but the specific surface area is also limited, the preparation process can not guarantee unlimited increase in the specific surface area of ​​the catalyst; (2) using metal oxides with stable crystal structure as the catalyst active component, such as metal oxides with a perovskite structure Due to its special crystal structure, it usually has good thermal stability, but because the perovskite structure material does not have a high specific surface area in nature, its catalytic activity, especially at low temperature, is poor, and it is difficult to use it in practical applications. As a substitute for noble metal catalysts; (3) disperse highly active catalysts on oxides with high thermal stability, so that the two can make up for their respective defects, such as dispersing highly active manganese-based and copper-based catalysts on highly thermally stable oxides γ-Al with high specific surface area 2 o 3 In general, the overall specific surface area of ​​the catalyst is increased to avoid its structural collapse in the high-temperature water vapor working environment, but this method can only improve the stability of the catalyst to a certain extent in terms of structure, and cannot essentially solve the problem of metal oxide catalysts in the environment. Poor stability in high temperature water vapor environment

Images