添加氧化铈对铁锰复合氧化物脱除羰基硫的影响

采用共沉淀法制备铈掺杂铁锰复合氧化物脱硫剂，对掺杂和未掺杂脱硫剂进行XRD、SEM、TG和XPS分析，并对脱硫剂在325℃下进行脱硫实验。实验结果表明，脱硫剂微粒的晶粒尺寸、分散度和表面元素形态随氧化铈的添加有所改变。和未添加氧化铈脱硫剂相比，添加氧化铈脱硫剂晶粒变小，各元素结合能有所增加。掺杂氧化铈后脱硫剂中氧化物分散性增强，表面吸附氧量增加，脱硫剂在还原气氛中易被还原。脱硫实验表明，添加氧化铈增强了脱硫剂脱除羰基硫的活性，羰基硫脱除精度有较大提高。此外，脱硫剂中添加适量氧化铈可以延长脱硫剂的穿透时间，但过量的氧化铈加入会使穿透时间缩短。

Effect of CeO2 doping on desulfurization performance of iron-manganese composite oxide in COS removal

Iron manganese composite oxides doped with CeO2 as desulfurizer were prepared by co precipitation and characterized by XRD, SEM, TG and XPS. Its performance in desulfurization was investigated at 325℃ and atmospheric pressure. The results illustrated that CeO2 doping may influence the crystal size, dispersion and surface configuration of iron manganese composite oxide. As compared with the desulfurizer without CeO2, smaller crystal size and better dispersion can be achieved through CeO2 doping. The content of chemisorbed oxygen on the desulfurizer surface was increased through the addition of 3% CeO2 in iron manganese composite oxides; its reduction and desulfurization performance were also improved largely. The addition of proper content of CeO2 in iron manganese composite oxide may increase the active sites for COS adsorption and then enhance its desulfurization activity in COS removal, however, excess amount of CeO2 may cause a negative effect on the desulfurization capacity.