The application of pseudo-boehmite in automobile exhaust catalysts uses three-way catalysis to convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. Since these gas molecules are all small molecules, pseudo-boehmite with a small pore size is "just right" as a carrier glue for automobile exhaust catalysts.

As a type of evolutionary series with uncertain composition and incomplete crystallization from disorder to order, weak crystalline state to crystalline state, the typical structure of pseudoboehmite (AlOOH·nH2O, n=0.08-0.62) is very thin The wrinkled lamellae are also called gelatinous boehmite, pseudoboehmite, boehmite colloid or boehmite-like.

Since the pore structure of pseudo-boehmite is also closely related to the preparation process, the physical properties of products obtained by different methods vary greatly. For example, pseudo-boehmite prepared by the nitric acid method has the characteristics of narrow pore size distribution; the alkali precipitation method can be used to prepare γ-Al2O3 carriers with large pores and large specific areas under appropriate neutralization conditions; and the NaAlO2-CO2 method can Pseudo-boehmite with a relatively wide pore size distribution is produced.

In modern refining and chemical industries, solid catalysts are generally used in the refining industry, which are composed of a carrier and an active component. The carrier is a unique component of solid catalysts. It can increase the specific surface area, improve heat resistance and mechanical strength. It is the dispersant, binder or support of the active component. Catalysts use many types of carriers, such as alumina, molecular sieves, silica gel, silica alumina gel, activated carbon, diatomaceous earth, etc.