废树脂催化剂制活性炭及其吸附脱除液化气中含硫化合物研究

PREPARATION OF ACTIVATED CARBON FROM DWACTIVED RESIN CATALYST AND ITS APPLICATION IN ADSORPTION DESULFURIZATION FOR LPG

以废树脂催化剂作为前躯体,经预处理、炭化和KOH活化后制备微球活性炭KAC,在最佳活化条件(碱炭质量比4∶1,活化温度800℃,活化时间1 h)下,所得KAC的比表面积可达2769 m^2/g,总孔体积为1.871 cm^3/g。采用等体积浸渍法制备铜离子负载活性炭吸附剂Cu-KAC,试验结果表明,铜离子改性可显著提高吸附剂对液化气的吸附脱硫性能,当铜离子负载量(w)为10%时,在氮气气氛、400℃下焙烧2 h后得到的吸附剂脱硫性能最佳。二甲基二硫醚-程序升温脱附分析结果表明,与KAC相比,Cu-KAC对二甲基二硫醚具有更强的络合吸附能力。Cu-KAC的再生性能考察结果表明,在氮气气氛、400℃下再生2 h,经4次连续再生后,再生吸附剂对液化气的脱硫率仍能达到60%左右。

The low cost spherical activated carbon(KAC)was prepared by pretreatment,carbonization and KOH activation with deactivated MTBE resin catalyst as the precursor.The KAC prepared at the optimal KOH activation conditions of a base carbon mass ratio of 4∶1,an activation temperature of 800℃,and an activation time of 1 h,has a specific surface area of 2769 m^2/g with the total pore volume of 1.871 cm^3/g.The Cu-KAC adsorbent was prepared by incipient impregnation method.The test showed that the adsorptive desulfurization performance of the adsorbent on LPG could be significantly improved by the modification of copper ions.The desulfurization performance of the adsorbent was the best when the load of copper ions was 10%and the adsorbent was calcinated at 400℃for 2 h in N 2.The results of methyl disulfide-TPD analysis showed that Cu-KAC adsorbent had stronger complexation adsorption capacity for DMDS than KAC.The regeneration performance of Cu-KAC adsorbent showed that the desulfurization rate of LPG could reach 60%after four times of regeneration at 400℃for 2 h in N 2.