Zibo XiangRun Environment Engineering Co., Ltd.The molecular sieve catalyst has high activity, selectivity, stability and anti-drug and other advantages. Thus, in recent decades it is as a very fast development of new chemical materials, applications are increasingly widespreading. Particularly in the petroleum refining and petrochemical industry, as industrial catalysts, it plays a very important role. This article detailed describes the composition & prospects of zeolite catalysts, performance
Keywords:molecular sieve, zeolite
1. Zeolite formation and chemical composition
1.1 The formation of a molecular sieve 1.1
Zeolite is a crystalline aluminosilicate, which has a uniform pore structure. The molecular sieve structure contains a large amount of crystal water , in the heating process, it will form a plurality of cavities of different sizes due to loss of water of crystallization, and there are many same diameter cavity, so it will form a homogeneous molecular size diameter channel. Therefore, it can exclude molecular which diameter is larger than pore to achieve the role of screening molecules. So, it is called molecular sieve.
1.2 The chemical composition of molecular sieve:
Formula M is a metal cation; n is the valence of the metal cation; x is the number of molecules; y is the number of molecules; z is the number of water molecules. Because negatively charged, the presence of metal cations may remain electrically neutral molecular sieves.
2. Performance of molecular sieve:
All solid material has a surface adsorption, only a porous substance or substances, have a significant effect of large adsorption surface area. It is a good adsorbent. Commonly used solid adsorbents are: activated carbon, silica gel, activated alumina and molecular sieve. Zeolites which has a very important role in terms of adsorptive separation, in addition to its high adsorption capacity, there is a unique shape-selective selective adsorption performance. This is because it has a regular pore structure and uniform arrangement of these fixed and pore size of the aperture determines the size of the zeolite can enter the interior of the molecular sieve.
2.1 Adsorptive adsorption
2.2 High adsorption
2.3 catalyst performance of zeolite
2.4 Ion exchange properties of molecular sieve
