硬脂酸前驱体法制铁酸锌脱硫剂及其在中温下的应用

以硬脂酸为凝胶剂，经由溶胶、凝胶、煅烧等步骤直接合成了晶体尺寸为纳米级(15nm～32nm)的铁酸锌脱硫剂，并应用TG-DTA、XRD、BET等测试手段对干凝胶及所得产品进行分析表征。结果表明，硬脂酸前驱体法合成温度低，操作简便。随着煅烧温度的升高，产品的比表面积减小，平均粒径增大，脱硫性能变差；该法制备的脱硫剂在350℃~550℃活性高，脱硫精度高，硫容大，而且再生性能良好，450℃下完全再生。

Moderate temperature desulfurization by zinc ferrite prepared with stearate precursor

Nanocrystalline ZnFe2O4 with crystallite size of 15nm～32nm was directly synthesized by stearate precursor. The overall process involves three steps: formation of homogeneous sol, formation of dried gel, and calcination of the dried gel. TG-DTA, XRD and BET techniques were used to analyze and characterize the dried gel and the as synthesized sorbent, respectively. The results show that the zinc ferrite prepared by stearate precursor could proceed at relatively lower temperature. The calcination temperatures have great impact on the desulfurization performance of zinc ferrite. When the temperature increases, the specific surface area decreases and the average crystallite size increases, which results in deterioration of desulfurization performance of the sorbent. The prepared sorbent shows a high reactivity and high sulfur capacity when operated at moderate temperature range. It also has good reproducibility and can be regenerated even at 450℃. These indicate that the stearate precursor technique would be a potential approach for the synthesis of desulfurization sorbent.