改性活性炭吸附脱除柴油中的硫化物

Modification of activated carbon for adsorption removal of sulfide in diesel oil

采用氧化剂对椰壳活性炭进行改性,研究了改性活性炭吸附柴油中硫化物性能,利用氮吸附、XRD和Boehm滴定法系统的表征了吸附剂改性前后的变化。结果表明,改性后的活性炭比表面积、孔容有所下降,但是表面酸性官能团有很大的提高;改性后的活性炭表面负载的金属离子主要以Fe3+和Ni2+的形式存在。脱硫实验表明,经0.3 mol/L的硝酸铁和0.2 mol/L的硝酸镍复配浸渍12 h,在300℃干燥6 h后,在500℃的氮气氛围中焙烧3 h,制得的Ni-Fe/HAC的脱硫效果最优,其穿透容量可以达到3.38 mg S/g。静态吸附12 h后,其脱硫率可达58%。

Bamboo activated carbon was used to produce modification activated carbon by metal solution activation in different conditions. Study on the modification of activated carbon for adsorption of sulfides performance in diesel oil. The adsorbents were characterized by N2 adsorption, XRD and Boehm titration. The results showed that the introduction of metal on activated carbon caused an decreasing in surface area and pore volume. However, it significantly increased in the density of acidic group on activated carbon sur- face. The metal irons mainly existed in the form of Fe3 ＋ and Ni2＋. Desulfurization test results showed that Ni-Fe/HAC has best adsorption capacity among the prepared adsorbents and the breakthrough capacity can reach to 3. 38 mg S/g when impregnated in ferric nitrate （0. 3 mol/L） and nickel nitrate （0.2 mol/L） compound aqueous solution for about 12 h,dried at 300 ℃ for 6 h,then activated in nitro- gen atmosphere at 500 ℃ for 3 h. The desulfurization rate of Ni-Fe/HAC can reached to 58% when ad- sorption time was 12 h under static adsorption experiment.