Removal of phosphorus and sulfur from yellow phosphorus off-gas by metal-modified activated carbon

Abstract In order to provide comprehensive utilization of high concentration CO for mono-carbon (C1) chemical industry, the purification of yellow phosphorus off-gas is of great concern. In this research, activated carbon (AC) modified by different impregnants were used for removal of PH 3 , H 2 S, SO 2 , COS, and CS 2 in yellow phosphorus off-gas. For the removal of PH 3 , AC impregnated with 0.10 mol L −1 CuAc 2 was proved to be the best adsorbent. And removal efficiency of H 2 S could be significantly enhanced by AC impregnated with 7% Na 2 CO 3 . The results of plant experiments suggested that the total concentration of the impurities in yellow phosphorus off-gas was less than 1 mg Nm −3 after purification operation. The metal-modified activated carbon (MMAC) was systematically characterized in terms of XPS, TGA, and DTA. The adsorption reaction mechanism was also investigated. As a result, the yellow phosphorus off-gas purified in this study can be used as a raw material gas in the C1 chemical industry.