High heat-resistant modified alumina and its preparation method

Abstract

The invention discloses a high heat-resistant modified aluminum oxide and a preparation method thereof. The high heat-resistant modified aluminum oxide is composed of aluminum oxide and a thermally-stabilised auxiliary agent, wherein the content of the thermally-stabilised auxiliary agent is 1 to 5% of that of aluminum oxide, and the thermally-stabilised auxiliary agent is one or more selected from zirconia, barium oxide or manganese dioxide. The preparation method comprises following steps: pseudo-boehmite is subjected to roasting pretreatment so as to obtain an active aluminum oxide precursor, the active aluminum oxide precursor is pretreated by an organic acid, and the thermally-stabilised auxiliary agent and a pore-enlarging agent are added so as to obtain the high heat-resistant modified aluminum oxide. Compared with existing products and technologies, characteristics of the high heat-resistant modified aluminum oxide and the preparation method are that: cost is low, processes are simple, preparation is convenient, repeatability is high, the specific surface area of the obtained products is large, and high temperature ageing resistance of the obtained products is high. The high heat-resistant modified aluminum oxide can be widely used for exhaust gas purification or catalytic combustion such as automobile exhaust purification, organic exhaust gas elimination and natural gas catalytic combustion.

Description

technical field [0001] The invention relates to an alumina catalytic material and a preparation method thereof, in particular to an alumina catalytic material suitable for exhaust gas purification or catalytic combustion such as automobile tail gas purification, organic waste gas elimination and natural gas catalytic combustion. Background technique [0002] Reducing vehicle exhaust pollution, protecting the quality of the atmospheric environment, and realizing the sustainable development of the ecological environment and society are one of the important issues of my country's environmental protection at present and in the future for a long time. [0003] In order to reduce pollution, breakthroughs must be made in three aspects: improving the quality of gasoline, improving the combustion state of the engine, and increasing the catalytic efficiency of exhaust gas purification. So far, the most effective way to use automobile exhaust purification catalysts is to reduce the con...

AI Technical Summary

Problems solved by technology

[0012] Peptization method and impregnation method are the conventional methods for preparing modified alumina at present, but the pseudo-boehmite is usually treated and modified, and the specific surface area of ​​the prepared modified alumina will be greatly reduced after high-temperature aging , poor heat resistance

Images