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What are the properties of molecular sieves?

There are many substances in our life, and there are many impurities in these substances. If we only rely on our hands, it is impossible to filter impurities. Before using molecular sieves, we need to know more about relevant knowledge, so that we can better play the role of molecular sieves. So what do we mean by molecular sieves? What are the properties of molecular sieves?

Classification of molecular sieves

According to the catalytic properties, molecular sieve catalysts can be divided into the following points: acid catalysts, which use the surface acidity of molecular sieve for catalytic reaction. Bifunctional catalysts: molecular sieves can be loaded with platinum and palladium metals to obtain bifunctional molecular sieve catalysts with both metal catalysis and acid catalysis. Shape-selective catalysts, because the catalytic action of molecular sieves generally occurs in the crystal space, the pore size and pore structure of molecular sieves have a great impact on the catalytic activity and selectivity. Molecular sieves have regular and uniform intra-crystalline pores, and the pore size is close to the molecular size, so the catalytic performance of molecular sieves changes significantly with the geometric size of reactant molecules, product molecules or reaction intermediates.

What are the properties of zeolite molecular sieve?

1. Adsorption performance: The adsorption of zeolite molecular sieve is a physical change process. The main reason for adsorption is a "surface force" generated by the action of molecular gravity on the solid surface. When the fluid flows through, some molecules in the fluid collide with the surface of the adsorbent due to irregular movement, resulting in molecular concentration on the surface, reducing the number of such molecules in the fluid and achieving the purpose of separation.

2. Ion exchange performance: generally speaking, ion exchange refers to the exchange of compensating cations outside the framework of zeolite molecular sieve. The compensation ions outside the framework of zeolite molecular sieve are generally protons and alkali metals or alkaline earth metals, which are easily exchanged by ions in the aqueous solution of metal salts into various valence metal ion-type zeolite molecular sieves. Ions are easy to migrate under certain conditions, such as water solution or higher temperature. In aqueous solution, zeolite molecular sieves can exhibit different ion exchange properties due to their different ion selectivity. The hydrothermal ion exchange reaction between metal cations and zeolite molecular sieve is a free diffusion process. The diffusion rate restricts the exchange reaction rate. Through ion exchange, the pore size of zeolite molecular sieve can be changed, thus its performance can be changed, and the purpose of shape-selective adsorption and separation of mixture can be achieved.

Molecular sieve is a kind of zeolite commonly used to filter impurities in our life. Molecular sieve can be seen on many occasions. Many people do not know molecular sieve very well. In order to better play the role of molecular sieve, we need to have enough understanding of molecular sieve. It can be understood from many aspects. Those who need it can refer to the above introduction to molecular sieves, or go directly to professional websites to have a detailed understanding, so that molecular sieves can play a greater role.

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