摘要
为提高低温脱硝催化剂的耐硫性能,催化剂的失活机制研究显得尤为重要。采用等体积浸渍法制备了以锰氧化物为活性组分的MnO_x/PG-AC以及掺有金属铁的MnO_x-FeO_y/PG-AC催化剂,经SO_2的暂态响应及其吸脱附技术、场发射扫描、X射线光电子能谱等表征手段研究了烟气中SO_2对催化剂的脱硝性能影响。结果表明,不同浓度的SO_2对催化剂MnO_x/PG-AC的活性影响均高于MnO_x-FeO_y/PG-AC,主要是助剂铁的加入使得SO_2在催化剂表面的吸附增强,提高了催化剂的表面分散度、抑制其活性组分的硫酸化。
In order to improve the sulfur resistance of DeNOx catalyst at low-temperature, the researchof catalyst deactivation mechanism is particularly important. MnOx/PG-AC and MnOx-FeOy /PG-AC catalystsprepared by pore volume impregnation method have been investigated for NH3-SCR reaction. The technologyof adsorption and desorption, the transient response of SO2 were used to investigated the influence of SO2.Catalysts were characterized by FESEM, BET surface area and XPS. The SCR activity of the Fe -dopedcatalyst （MnOx-FeOy/PG-AC） was found to be higher than that of the undoped MnOx /PG-AC catalyst withdifferent concentrations of SO2. The results suggest that the iron oxide doping can enhance SO2 adsorption,and that the active components （manganese oxides） were well-dispersed. Moreover, the XPS results showedthat Fe-doped catalyst could inhibit manganese oxides sulfation.
出处
《淮南师范学院学报》
2017年第5期96-100,共5页
Journal of Huainan Normal University
基金
淮南师范学院科研项目"低温SCR脱硝催化剂Mn-Ce/p G的改性及其抗硫性研究"(2015xj16)
