氧化铁改性活性炭的制备及其吸附脱硫性能

摘要

制备了负载型氧化铁改性活性炭吸附剂,并采用比表面积(BET)、扫描电镜(SEM)技术对吸附剂进行了表征.在固定吸附床上考察了制备条件及吸附条件对吸附剂脱除硫化氢性能的影响.研究结果表明,负载氧化铁后吸附剂的比表面积由580.4 m2/g提高到658.6 m2/g,氧化铁改性能有效改善活性炭对硫化氢的吸附脱除能力.氧化铁与活性炭的质量比为1∶1,真空干燥温度为70℃,干燥时间为36 h时得到的负载氧化铁吸附剂的吸附效果最好.在吸附温度为60℃时,饱和硫容和脱硫率分别达到77.4 mg/g和99.2％.饱和硫容比未经改性的活性炭的提高了60.2 mg/g.%Iron oxide supported activate carbon adsorbents were prepared, and the adsorbents were characterized by scanning electron microscope (SEM) and specific surface area (BET). Effects of preparation condition and adsorption condition on the performance of hydrogen sulphide removal were studied using a fixed-bed adsorption column. Experiment results of showed that specific surface area of the activate carbon adsorbents after loading iron oxide increased from 580.4 m2/g to 658.6 m2/g, and the performance of hydrogen sulphide removal of absorbent was effectively improved by loading iron oxide over activate carbon. The absorbent with iron oxide to activate carbon mass ratio of 1:1, vacuum drying temperature of 70 ℃ and drying time of 36 h was found to give the best performance. At the adsorption temperature of 60 ℃, the saturated sulfur capacity and desulfurization rate reached 77.4 mg/g and 99.2%, respectively. The saturated sulfur capacity was improved by 60.2 mg/g compared with unmodified activate carbon.