Zibo Xiangrun and Shandong Bairui have a great study on high specific surface and large-middle pore pseudoboehmite and al2o3.

Zibo Xiangrun and Shandong Bairui have a great study on high specific surface and large-middle pore pseudoboehmite and al2o3.

Below please find the basic study on high specific surface and large-middle pore pseudoboehmite and al2o3.

Pseudo-boehmite (AlOOH · nH2O, n = 0108-0162), also known as gelatinous boehmite, pseudo Π quasi Π pseudo-boehmite, pseudoboehmite or boehmite, Is a kind of indeterminate, incomplete crystallization from disorder to order, weak crystalline to crystalline evolution series, the typical structure is very thin wrinkled layer. It has many advantages, such as zero charge and high Gibbs free energy, high porosity, high specific surface, good dispersibility and good solubility, and thixotropic gel. It is mainly used as raw material for preparation of γ Al2O3, α Al2O3 and difficult to be molded catalyst or Catalyst carrier. The γ Al2O3 calcined at 400-700 ℃ is widely used as catalyst carrier, catalyst and adsorbent. Industrialized methods of preparation of pseudo-boehmite, including Al-alcohol hydrolysis, alkali (acid precipitation) and acid (alkali precipitation). The porosity and specific surface area of the γ Al2O3 calcined product are closely related to the crystallinity, particle size, aggregation state and morphology of the precursors. The pore volume and specific surface area are usually less than 150cm3 · g-1 and 250m2 · g-1, respectively.

With the deep processing of raw materials around the world to improve the requirements of the main energy structure gradually to the direction of development of macro molecules and high-carbon, crude oil for the heavy mass of China even more so. In order to solve the problems such as excessive diffusion resistance of heavy oil components in catalyst pores, heavy metal impurity deposition and coking, the γ Al2O3(Gamma al2o3) carrier widely used in petrochemical industry is urgently required to have large pore volume and high porosity. Specific surface characteristics. The large pore volume favors the diffusion of macromolecular compounds into the catalyst particles, and the high specific surface area favors the dispersion of the active metal, thus improving the catalytic performance of the catalyst. For example, the heavy oil hydrodenitrogenation catalyst requires a pore volume of more than 0.16 cm3 · g-1 and a specific surface area of more than 250m2 · g-1 and a pore radius of 2-5nm accounting for more than 60% of the total pore size distribution. The demetallization catalyst requires γ Al2O3 to have a bimodal pore distribution of <100nm and> 100nm, while the residue hydrodesulfurization and demetallization catalyst require the bimodal pore distribution of γ Al2O3 to be 1715-2715nm and> 300nm. In addition, the adsorption field also need to develop large pore capacity γ Al2O3, in order to increase the unit adsorption capacity.

The preparation process of pseudoboehmite and γ Al2O3 usually includes the processes of gelation, aging, washing, drying, molding and roasting. The pore structure can be controlled by gel precipitation and aging process. As well as by the organic solvent replacement gel in the water and solvent heat method and other methods to achieve.

Zibo Xiangrun and Shandong Bairui could reply you much questions on study on high specific surface and large-middle pore pseudoboehmite and al2o3.  Please find the professional manufacturer of pseudoboehmite and pseudo boehmite alumina powder. We are here to wait for you.