Application of pseudo-boehmite in industrial catalysis

Pseudo-boehrite is widely used in the field of industrial catalysis, and its special physical and chemical properties make it play an important role in catalyst production and environmental protection. The following is the specific application of pseudo-boehmite in various fields:

1. As a raw material for gamma alumina

Pseudoboehmite is an important raw material for the preparation of gamma alumina. Gamma alumina inherits the characteristics of large specific surface area, high activity and strong adsorption of raw materials, so it is widely used in the synthesis of high-temperature structural ceramics such as aluminum nitride ceramics. In addition, nano-γ-al2o3 has an important application in chemical mechanical polishing (CMP), and the CMP paste prepared by nano-γ-al2o3 as a grinding particle can be used for the flattening of tungsten, aluminum, copper and other metals as semiconductor wiring materials and thin film materials in the middle of the integrated circuit production process, as well as the polishing of advanced optical glass, quartz crystals and various gems.

2. Used as hydrogenation catalyst

Hydrogenation technology has been widely used in the process of efficient utilization of petroleum resources and clean oil products, and hydrogenation catalyst is the core of hydrogenation technology. The γ-alumina carrier used for hydrogenation catalyst is usually made of pseudo-boehmite by roasting and dehydration, which has the characteristics of large specific surface area, adjustable pore volume and pore distribution, and acidic center with different properties on the surface, so as to improve the catalytic activity.

3. Used as a bonding agent

The use of pseudo-boehmite as adhesive is not only beneficial to the formation of the carrier, but also affects the catalytic performance of the catalyst. In the selective catalytic reduction of Ce-Mn/TiO2 catalyst in flue gas denitration, the addition of pseudo-boehmite as the adhesive can not only improve the mechanical strength of the catalyst, but also improve the selectivity of the denitration agent.

4. Prepare γ-Al2O3 coating

Coating the carrier with a high surface active coating is a common method to improve the specific surface area of the carrier, and gamma alumina is the most commonly used coating material at present. This kind of aluminum sol is prepared by the method of acid gel dissolution using pseudo-boehmite as raw material, the process is simple and easy to control, and can be used in industrial production.

5. Application in automobile exhaust catalyst

The application of pseudo-boehmite in automobile exhaust catalyst is mainly to use its small aperture characteristics as a catalytic carrier adhesive for automobile exhaust gas, effectively converting harmful gases such as CO, HC and NOx in automobile exhaust gas into harmless carbon dioxide, water and nitrogen through oxidation and reduction.

6. Application in chemical industry

In the chemical industry, pseudo-boehmite is mainly used as a binder for catalytic cracking catalysts. This binder can adjust the pore size distribution of catalysts, improve the thermal and hydrothermal stability of catalysts, adjust the acid active center density of catalysts, and thus improve the catalytic activity.

Pseudo-boehmite has various preparation methods, different properties and different uses. The following is a variety of pseudo-boehmite products and their performance parameters, welcome interested friends to consult.