Effect of H2-regeneration on SO2 removal activity of V2O5-CoO/AC
-
摘要: 烟气脱硫后的V2O5-CoO/AC催化吸附剂在H2气氛下再生，并将再生尾气连续返回反应器，可以同时达到再生和资源化制备硫磺的目的。着重考察了不同情况下H2循环再生后V2O5-CoO/AC的二次脱硫活性，结果表明，硫磺制备要求系统中的硫在固相和气相之间发生多次形态转变，再生后催化-吸附剂上的残余硫使二次脱硫活性有所下降。主要原因是催化-吸附剂上的残余硫占据了脱硫所需的微孔，增加了表面酸量。再生后的H2吹扫可以将部分残余硫以H2S的形式赶出，提高二次脱硫硫容。NH3表面改性也可以降低表面酸量，提高二次脱硫硫容。Abstract: Elemental sulfur can be produced simultaneously during H2-regeneration of SO2-adsorbed V2O5-CoO/AC catalyst-sorbent when effluent gas of the regeneration is recycled back to the reactor. SO2 removal activities of the catalyst-sorbents after the regeneration under different conditions were studied in detail. It is found that elemental sulfur production requires transformation of sulfur forms between the solid phase and the gas phase, which results in residual sulfur in the catalyst-sorbent and a decrease in the subsequent SO2 removal activity. The residual sulfur occupies a portion of micro-pores of V2O5-CoO/AC and increases its surface acid amounts. Both of them can be attributed to the decrease in SO2 removal activity. H2 purge after the regeneration is effective for converting the residual sulfur to H2S and increasing the SO2 removal activity. NH3 treatment after the regeneration is also helpful to improve the SO2 removal activity.
-
Key words:
- V2O5 /
- CoO /
- activated carbon /
- SO2 /
- H2 /
- regeneration /
-
点击查看大图
计量
- 文章访问数: 1990
- HTML全文浏览量: 31
- PDF下载量: 1148
- 被引次数: 0
下载:
