Preparation and performance evaluation of mercury removal adsorbent for natural gas

Mercury removal adsorbents (Al₂O₃-CuS-S) are prepared by using Al₂O₃ as carriers, which carry S and CuS as active substances successfully by soaking in CS₂ solution of S and aqueous solution of Cu (NO₃)₂ and Na₂S respectively. The active components are characterized by X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometer(SEM-EDS).When the concentration of Cu²⁺ dipping solution is 18%, the concentration of S^2- dipping solution is 8.1%, and the concentration of S dipping solution is 6%, the mercury removal agent active substance load is optimal; and the content of CuS is 11.98%, and the content of total sulfur is 8.85% in the prepared mercury removal adsorbents. Effect of mercury content at inlet and residence time on mercury removal is investigated in the experiment. The result shows while the inlet mercury content is 300 μg/m³ and the residence time is 2 s, the outlet mercury content is 10.35 μg/m³ and the mercury removal rate is 96.55%, which has reached the mercury removal requirement of industrial natural gas, and can be used in industrial production.