CuO/AC@SiO_2的制备及对H_2S的深度脱除

采用模板法在CuO外包裹一层具有介孔结构的SiO_2,制备了CuO/AC@SiO_2。采用X射线衍射仪对CuO/AC@SiO_2的结构和催化活性位点进行了表征。通过固定床气固吸附实验,研究了CuO/AC@SiO_2对H_2S的吸附脱除性能。表征结果显示,CuO是催化氧化H_2S的活性中心,被氧化成Cu2O后吸附脱除H_2S的性能下降。实验结果表明:CuO/AC吸附H_2S时的有效穿透时间为117 min,CuO/AC@SiO_2的有效穿透时间提高到141 min,CuO/AC@SiO_2对H_2S的吸附性能明显提高;以Cu(NO_3)_2为前驱体的CuO/AC@SiO_2对H_2S的吸附量高于以Cu(AC)_2为前驱体;在Cu(NO_3)_2为前驱体、m(正硅酸乙酯)∶m(CuO/AC)=0.7、吸附温度为90℃的最佳条件下,CuO/AC@SiO_2对H_2S的吸附量达17.40 mg/g。

Preparation of CuO/AC@SiO2 and deep removal of H2S

CuO/AC@SiO₂ was prepared by coating a layer of mesoporous SiO₂ on CuO with template method. The structure and catalytic active site of CuO/AC@SiO₂ were characterized by XRD. The adsorption capability of CuO/AC@SiO₂ to H₂S was studied by gas-solid adsorption experiment in fixed bed reactor. The characterization results indicate that CuO is the active center for H₂S catalytic oxidation,and when CuO is reduced to Cu₂O,the H₂S removal effect is decreased. The experimental results show thatThe effective penetration time of CuO/AC and CuO/AC@SiO₂ is 117min and 141min respectively,so the adsorption capability of CuO/AC@SiO₂ to H₂S is obviously improved;The adsorption capacity of CuO/AC@SiO₂ using Cu（NO₃）₂ as precursor is higher than that using Cu（AC）₂;Under the optimum conditions of using Cu（NO₃）₂ as precursor,m（tetraethyl orthosilicate）∶m（CuO/AC）=0.7 and adsorption temperature 90 ℃,the H₂S adsorption capacity of CuO/AC@SiO₂ is 17.40 mg/g.