Alumina composite oxide and preparation method thereof

Abstract

The invention discloses an alumina composite oxide and a preparation method thereof. The alumina composite oxide comprises, by weight, the chemical components of 1 to 15 parts of cerium-zirconium mixture, 70 to 95 parts of alumina, 3 parts of lanthana and 1 to 15 parts oxide of metallic elements in the third period and the fourth period of periodic table of chemical element except aluminum. The high temperature and aging resisting performance of the alumina is improved greatly by adulterating rear earth and oxide of transition metal. According to the preparation method of the alumina composite oxide, the alumina composite oxide is effectively prevented from drying and hard aggregating through an aging reaction and microwave drying under the condition that a surface active agent is not used, so that the dispersity of powder particles is improved; no organic waste gas is generated in the calcinating process, being environmentally friendly is achieved, and grinding is not needed for a finished product after calcinating is conducted; the specific area of the produced material is large by controlling proper temperature in the calcinating process; calcinating is conducted for 4 to 8 h at the temperature of 700 to 850 DEG C, the specific area is 230 to 260 m2 / g, and the aging specific area is 100 to 130 m2 / g after aging is conducted for 10 h at the temperature of 1000 DEG C; the production technology is simple, controlling the process is easy, the price of raw materials is cheap, the production cost is low, and industrial production is easy to achieve.

Description

technical field [0001] The invention relates to a composite oxide material, in particular to a coating material and redox type catalyst carrier which can be widely used in various types of exhaust gas purification catalysts, especially for tail gas treatment catalyst coatings fueled by gasoline, diesel, LPG and natural gas. Alumina composite oxide for layer material application and preparation method thereof. Background technique [0002] With the development of social industry, fuel machinery has replaced manual labor and greatly improved work efficiency, but the harmful gases emitted by fuel machinery exhaust and industrial organic waste gas are also polluting the atmospheric environment on which human beings live, especially in recent years. , the harm of exhaust emissions to human health has been paid more and more attention by human beings. In order to reduce the harm of exhaust emissions to humans, humans have invented catalytic converters that can convert harmful exh...

AI Technical Summary

Problems solved by technology

[0003] The research on modified alumina coating materials mainly focuses on the doping of rare earth metals and alkaline earth metals to improve the high temperature stability of alumina, but under the increasingly stringent emission limit requirements, higher performance modified oxides are required. Aluminum coating materials are used to meet the use environment of the catalyst. In the current research, the preparation methods used to improve the performance of the modified alumina use surfactants to help improve the performance of the alumina material, resulting in another It brings pollution to the environment, so there are defects such as high material preparation cost, complicated preparation process, and serious environmental pollution.