At present, the main use of pseudo-boehmite is as a raw material for preparing alumina and an adhesive for difficult forming catalyst or catalyst carrier. The alumina prepared by roasting pseudo-boehmite has a high specific surface area and is widely used as a catalyst and catalyst carrier in petrochemical industry.
1. used for nanometer alumina raw materials
One of the important USES of pseudo -boehmite is the raw material of aluminium oxide.Based on the characteristics of large specific surface area, high activity and strong adsorbability of raw materials, it has been used to synthesize high-temperature structural ceramics such as aluminum nitride ceramics.In addition, nano -Al2O3 is especially suitable for chemical mechanical polishing (CMP), by nano -Al2O3 as grinding particles produced by CMP slurry can be used in the middle layer of IC production process as semiconductor wiring materials and film materials such as tungsten, aluminum, copper flattening, and advanced optical glass, quartz crystal and various gems polishing.
Figure -Al2O3 can be used for chemical mechanical polishing abrasive particles
2.For hydrogenation catalyst
In order to meet the requirements of petroleum resources utilization and clean oil, hydrogenated technology has been widely used, hydrogenation catalyst is the core of hydrogenation technology, used for hydrogenation catalyst gamma alumina carrier is usually composed of quasi thin diaspore by roasting dehydration, have specific surface area, entrance and adjustable pore distribution, surface exist different acidic center.Better mechanical strength and thermal stability, plus a low – cost characteristics.
Graphic catalysts are essential for the production of petroleum products
In modern oil refining and chemical industry, more than 90% of chemical reaction process is realized by catalytic process, so catalyst has become the key to realize new refining and chemical process, new product development.In the oil refining industry, solid catalysts are commonly used, which are composed of carrier and active component.The carrier is a special component of the solid catalyst, which can increase the specific surface area, improve the heat resistance and mechanical strength.The catalyst USES many kinds of carrier, such as: alumina, molecular sieve, silica gel, silica gel, activated carbon and diatomaceous earth.However, the amount of alumina carrier accounts for more than half of the total amount of catalyst carrier.Catalytic cracking (FCC) catalyst is the core of catalytic cracking process.As the world’s crude oil heavy and inferior, in catalytic cracking raw material blending heavy oil, residual oil has become a widely used way of processing, so requires oil catalytic cracking (FCC) catalyst has to be heavy oil molecular diffusion of big hole, and the big hole in the center should have appropriate acid density, in order to improve the catalyst cracking ability of macromolecular compounds in raw materials.Active alumina is commonly used to improve the catalyst matrix.The large pore volume is conducive to the diffusion of macromolecular compounds into the catalyst particles, while the high specific surface area is conducive to the dispersion of the active metal, so as to improve the reaction performance of the catalyst.
3.Used as adhesive
Quasi thin diaspore carrier used as bonding agent is not only beneficial to molding, will also affect the performance of catalyst, the researchers in the flue gas denitration selective catalytic reduction Ce – Mn/TiO2 catalyst in the process of joining thin diaspore as bonding agent, found that not only significantly improve the mechanical strength of catalysts, also improved the denitration surfactant selective catalyst.
4.repare a -Al2O3 coating
The activity of coating a layer on the carrier surface coating carrier is to increase the specific surface area of the commonly used method, gamma alumina is one of the most commonly used coating material, with high specific surface area, help to active component in the effective distribution in the process of impregnation, the preparation of commonly used gamma alumina coating for AlOOH precursor sol, the alumina sol to be thin diaspore as raw material, preparation, by using the method of acid peptization process easy to control, can be used for industrial production.
Post time: Apr-22-2020