氨再生条件对V2O5/AC同时脱硫脱硝活性的影响

对烟气同时脱硫脱硝过程中吸附SO2后的活性炭载V2O5（V2O5/AC）催化 吸附剂在含NH3气氛下的再生条件进行了考察，发现3%～5%NH3/Ar气氛、300℃、60min再生可有效恢复V2O5/AC的脱硫活性，并明显提高其脱硝活性。基于对SO2和NO的脱除率、再生后V2O5/AC的硫质量分数以及FT IR谱图分析发现，NH3的存在对V2O5/AC所吸附硫的脱附行为没有明显影响，但可显著改变V2O5/AC的表面化学性质，有利于烟气脱硫；NH3还可在V2O5/AC表面储存，显著促进脱硝。

NH3 regeneration of SO2-captured V2O5/AC catalyst-sorbent for simultaneous SO2 and NO removal

Activated coke (AC) supported V2O5 (V2O5/AC) is an efficient catalyst sorbent for simultaneous SO2 and NO removal from flue gas at 150℃～200℃. It was found that this type of catalyst sorbent can be effectively regenerated in the presence of NH3 at temperatures much lower than that required by AC under an inert atmosphere. Systematic experiments were performed in this study to know the effect of regeneration conditions on SO2 and NO removal activities in the subsequent cycles, including regeneration temperature (200℃～380℃), NH3 concentration (0%～5%), and regeneration time (10min～80min). Results indicate that the optimal regeneration conditions of SO2 captured V2O5/AC are: 300℃, 3%～5% NH3 in an inert atmosphere, 60min. With the aid of elemental analysis and FT-IR characterization, it was found that the regeneration serves three roles: desorption of the adsorbed sulfur species from the catalyst sorbent, surface modification by NH3, and adsorption (storage) of NH3 on the surface. The roles of NH3 are mainly in surface modification (chemical effect) and storage of NH3 on the surface (physical effect). The former occurs at relatively higher temperatures and favors SO2 removal and the latter is more significant at lower temperatures and favors NO removal.