1. Features and parameters

2. Application Scenarios and Advantages

Industry Solutions:

Petrochemical Drying: 3A molecular sieve deep dehydration (dew point <-70℃), protecting ethylene cracking catalyst

Gas Separation: 5A molecular sieve purifies nitrogen from air (purity ≥99.9995%)

Environmental Management: Zeolite adsorbs VOCs (toluene adsorption ≥300mg/g), replacing activated carbon to reduce operating costs by 50%

Automotive Catalysis: ZSM-5 zeolite as SCR catalyst carrier, NOx conversion rate ＞95%

Production method

1. Hydrothermal synthesis is used to produce products with higher purity and synthesize molecular sieves that do not exist in nature. Silicon-containing compounds (water glass, silica sol, etc.), aluminum-containing compounds (hydrated alumina, aluminum salts, etc.), alkali (sodium hydroxide, potassium hydroxide, etc.) and water are mixed in appropriate proportions and heated in an autoclave for a certain period of time to precipitate molecular sieve crystals.

2. Hydrothermal conversion method In the presence of excess alkali, solid aluminosilicate is hydrothermally converted into molecular sieves. The raw materials used are kaolin, bentonite, diatomaceous earth, etc., and synthetic silica-alumina gel particles can also be used. This method is low-cost, but the product purity is not as good as the hydrothermal synthesis method.

3. Ion exchange method usually converts Na-molecular sieve into molecular sieve containing the required cations in aqueous solution.

Properties: White powder

Parameters: Relative crystallinity: ≥88%

Unit cell constant: 2.456-2.472nm

Average particle size: less than 6μm

SiO2/Al2O3: ≥5.3

SSA: ≥660m2/g

Na2O: ≤12.5%

LOI (loss on ignition): ≤15%

Static water absorption value: ≥32%

Application

Y-type molecular sieve has a large specific surface area and a high intracrystalline diffusion rate. Due to its structural and performance characteristics, it has been widely used in petroleum refining fields such as catalytic cracking, hydrocracking and isomerization.

Use as desiccant

Team Presentation