The working principle of dry adsorbed molecular sieve is mainly related to the pore size of molecular sieve, respectively 0.3nm/0.4nm/0.5nm, they can adsorb gas molecules whose molecular diameter is smaller than the pore size, and the larger the pore size, the larger the adsorption capacity.
The size of the aperture is different, and the filtered things are different. In simple terms, the 3a molecular sieve can only adsorb molecules below 0.3nm, the 4a molecular sieve must also adsorb molecules below 0.4nm and the 5a molecular sieve is the same.