Questions regarding molecular sieves and activated carbon for chromatography
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I have two small questions for the seniors here: 1. If I want to purchase 5A molecular sieve for gas purifiers, are there different specifications available? Is it the size specification of the particles? Also, is it calculated by weight or by volume? We use small particles, about 1*3 in size. 2. Furthermore, can molecular sieves and activated carbon be distinguished by appearance? We are using black particles; I’m not sure whether they are activated carbon or molecular sieves. Thank you! This post was last edited by Canghai Yili Sha on 2009-2-12 07:17.]
Three types of fillers can generally be added to gas purification units, with the following functions and appearances: 5A molecular sieve is yellow; its main function is to remove CO2 and organic substances, and it typically filters out N2, Ar, and He. Color-changing silica gel is blue; its main function is to remove H2O, and it generally filters out H2, as the main impurity in electrolyzed H2 is H2O. Activated carbon is black; its main function is to remove oils, and it is used to filter air, as compressed air or air compressors may produce oil, and activated carbon is the best material for removing oils. The black particles you are using are activated carbon. For 5A molecular sieves, in gas purifiers, spherical forms with a diameter of around Φ5 are sufficient. When purchasing, you can inform the manufacturer of the intended use, and they will give you recommendations. Communicate more with the manufacturer, and you will learn more.
1. Coming to Haichuan is for communication; everyone is equal. There is a sequence to entering this field, so there’s no need to be too polite. 2. 5A refers to the pore size of molecular sieves; it works on the same principle as activated carbon’s adsorption mechanism, using these pores to absorb relevant impurities. 3. Ordinary molecular sieves are off-white in color, and black ones are less common; you can give it a try to see the results