The adsorbents usually used in the industry include: the Silica gel ,active alumina, activate carbon molecular sieve and etc. Moreover, there are also other adsorption material as per some composition selective adsorption, whether the air can be successfully adsorbed, it is mainly depended on the adsorption performance, so the adsorbent selection is the first issue for the adsorption confirm.
Active aluminium oxide is made from the Aluminum hydrates are heated and dehydrated. Its performance is depended on the preliminary state form the hydroxide, it is usually not the pure Al2O3,Partially hydrated amorphous porous structural material.In which there are not only amorphous gels but also crystals of hydroxide.It has strong affinity for water and is an adsorbent for deep drying of trace water. Under the definite condition, the dry degree can be minus 70deg c of the dew point.
The zeolite molecular sieve is called the zeolite and also called molecular sieve. Its chemically composition as follows: [M2(Ⅰ)M(Ⅱ)]O.Al2O3.nSiO2.mH2O.
The zeolite has a function of molecular sieve, it has a uniform pore diameter, such as the fine pore of 3A0、4A0、5A0、10A0.The 4A0 zeolite with 4A0 pore size can adsorb methane and ethane without adsorbing the n-alkanes with more than three carbons.It has been widely used in gas adsorption separation, gas and liquid drying and the separation of isoalkane.