Study of PH3 Adsorption and Regeneration over CuO-ZnO-La2O3/Activated Carbon Adsorbents

CuO-ZnO-La₂O₃/activated carbon (AC) adsorbent was prepared and used for efficient adsorption removal of PH₃ at various temperatures in the presence of O₂. The feasibility of water and thermal regeneration of a spent CuO-ZnO-La₂O₃/AC adsorbent was also investigated. The influences of regeneration temperature, water concentration and calcination time were done on the spent CuO-ZnO-La₂O₃/AC adsorbent in order to optimize the regeneration processes. It be can be concluded that the CuO-ZnO-La₂O₃/AC adsorbent was an efficient adsorbent for PH₃ removal at various temperatures. The adsorbed amount of the MAC adsorbents increased with increasing adsorption temperature. The maximum PH₃ capacity (95~98 mg/g) was obtained on the CuO-ZnO-La₂O₃/AC at 70°C and 80°C. The optimal regeneration conditions in this research were steam regeneration at 400°C for 120 min and calcination in an oven with an air atmosphere at 350°C for 120 min. The present study confirmed that the CuO-ZnO-La₂O₃/AC would be one of candidates for PH₃ adsorption removal from yellow phosphorous tail gas.