柱状V2O5/AC中V2O5的分布特征对烟气脱硫活性的影响

采用过量浸渍(XS)、等体积浸渍(PV)和半等体积浸渍(HPV)方法，分别制得3种柱状V₂O₅/AC催化剂，并对其脱硫能力进行评价.结果表明:尽管这3种方法制取的催化剂总w(V₂O₅)相同(均为0.5%)，但V₂O₅在柱状颗粒中的分布差异却很大；其中半等体积浸渍法制备的催化剂外层w(V₂O₅)最高，等体积浸渍法的w(V₂O5)居中，过量浸渍法的w(V₂O₅)最低.脱硫前期，催化剂外层的w(V₂O₅)对脱硫活性的影响很大，外层w(V₂O₅)高的催化剂脱硫活性较高；脱硫后期，催化剂外层w(V₂O₅)对脱硫活性的影响变小，而内层w(V₂O₅)的影响变大，内层w(V₂O₅)高的催化剂脱硫活性较高. 

V2O5 Distribution in Cylindrical V2O5/AC Pellets and Its Effect on SO2 Removal from Flue Gas

V₂O₅/AC pellets with the same V₂O₅ loading were prepared by an excess solution impregnation (XS), pore volume impregnation (PV) and half of the pore volume impregnation (HPV), respectively. Although the total V₂O₅ content of threetypes of pellets is equal (e.g. all being 0.5%), the V₂O₅ distribution in the cylindrical pellets are quite different. V₂O₅ content of out surface prepared by HPV is highest in three V₂O₅/AC pellets prepared by different impregnations, andthat prepared by XS is lowest and that by PV is medium. S distributions of the three V₂O₅/AC pellets subjected to SO₂ removal for different time. The results show that the one with a high V₂O₅ content in its outer surface shows a high initial SO₂ removal activity, while the one with a high V₂O₅ content in its center shows a high SO₂ removal activity in the later stage.