I. Product Introduction
Y-type molecular sieve is a microporous crystal material with a skeletal structure, where the basic structural units are silicon-oxygen and aluminum-oxygen tetrahedra. These tetrahedra form secondary structural units such as tetrahedral, hexagonal, and octagonal rings through Si-O or Al-O bonds. These secondary units are then assembled to form β-cages. Eight β-cages are arranged in a diamond crystal pattern, with each carbon atom in the diamond structure replaced by a β-cage. Adjacent β-cages are connected by hexagonal rings via Si-O-Si (Al) bonds, creating octahedral zeolite cages. These octahedral zeolite cages are interconnected through dodecagonal rings along three crystal axes, forming a unit cell. The dodecagonal rings serve as the main windows of the octahedral zeolite, with a pore diameter of approximately 0.74 nm.
One,Composition of Y Molecular Sieve
Y Molecular Sieves include NaY Molecular Sieves and their modified products: Ammonium Y (NH4Y), Hydrogen Y (HY), Ultra-Stable Y (USY), Rare Earth Y (RY), etc.
Two,The relationship between NaY and its modified products.
1. NaY is synthesized from aluminum source, silicon source, and a directing agent under certain process conditions.
2. Ammonium Y obtained through ammonium chloride exchange from NaY.
3. Ammonium Y is converted to hydrogen Y through high-temperature calcination.
4. Hydrogen Y is processed through high-temperature hydrothermal treatment to obtain ultra-stable Y.
5. Rare earth Y is obtained through the rare earth exchange of hydrogen Y.
Section 3:Application of Y molecular sieve
1. In large quantities for manufacturing FCC catalysts
2. Used for manufacturing catalytic cracking catalysts
3. Hydrocracking catalyst manufacturing materials
4. Used for producing high-efficiency adsorption, separation, purification agents, and desiccants
Section 4: Quality Standards
1. NaY Quality Specifications
Project | Indicator |
Relative Crystallinity | ≥88% |
Silica-to-alumina ratioSiO2/Al2O3 | ≥5.1 |
Specific Surface Area | ≥680m2/g |
Na2O Content | ＜13.0% |
Lattice constant | 24.75×10-10m |
2. NaY-related modified products
Manufacture products to meet various quality specifications as per customer design requirements.Y Series Molecular Sieves
*Ammonium Y primarily varies in the content of sodium oxide.
Hydrogen Y is primarily differentiated by the varying content of sodium oxide and the required degree of crystallinity.
*Super Stable Y is primarily characterized by different sodium oxide content requirements, crystalinity standards, and silicon-to-aluminum ratio requirements.
Rare Earth Y is primarily characterized by different sodium oxide content and requirements for rare earth content.
