Pressure swing adsorption activated carbon, as a core adsorption material in the field of gas separation, works based on its selective adsorption characteristics for different gas molecules under pressure change conditions. This material uses coal-based or coconut shell activated carbon as the carrier. By precisely regulating the pore size distribution (microporosity > 70%) and surface chemical modification (loading of oxygen-containing functional groups 0.5-1.2mmol/g), it achieves the preferential adsorption of polar molecules such as nitrogen and carbon dioxide under high pressure conditions of 0.3-0.8MPa. The cyclic characteristic of rapid desorption when the pressure is reduced to 0.01-0.05MPa. In industrial applications, three key indicators must be met: adsorption capacity ≥12mL/g (under standard conditions at 25℃), compressive strength > 98N/ particle, and a cycle life exceeding 50,000 times. At present, the mainstream production process adopts the KOH activation method to prepare substrates with a BET specific surface area of 1500-1800m²/g, and then introduces surface acidic sites through phosphoric acid activation to enhance the capture ability of polar gases. In the oxygen generation device, when the raw air passes through the adsorption tower, nitrogen is preferentially adsorbed, increasing the oxygen purity to 93%±2%. The energy consumption of the entire system is controlled within the range of 0.4-0.6kWh/Nm³O₂. With the breakthrough in the composite technology of metal-organic framework materials, the separation coefficient of the new generation of pressure swing adsorption activated carbon has been increased to above 8.5, promoting technological innovation in the fields of medical oxygen production and chemical tail gas recovery.
