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为了解决燃煤电厂废弃商业SCR催化剂的处理以及充分利用锰基SCR催化剂的低温活性,提出了失活商业SCR催化剂再生的新方法:将失活的商业SCR催化剂作为载体,利用多步浸渍法,将锰氧化物(MnO_x)负载于载体上,制备成新的脱硝催化剂。利用XRF,XRD,SEM,XPS和N_2等温吸附等测试技术对新鲜催化剂、失活催化剂以及再生催化剂进行表征,以探究再生方法制备的催化剂相比失活催化剂带来的变化。结果发现,针对采用的原始失活催化剂来说,MnO_2负载质量分数为4.67%时,催化剂的综合理化性能和催化剂的脱硝活性最优。另外,再生的催化剂在250℃条件下仍然可以保持较高的脱硝活性,说明再生的催化剂具有更宽的活性温度窗口。再生催化剂中起到催化作用的是未中毒的V_2O_5以及负载的MnO_x。MnO_x可能为催化剂带来了低温活性。同时,催化剂在高空速下依然可以保持较高的催化活性。该再生方法不仅可以实现废弃的SCR催化剂的再生,还可以提升催化剂的催化性能。
In order to solve the disposal of waste commercial SCR catalyst in coal-fired power plants and make full use of low-temperature activity of Mn-based SCR catalyst, a new method of deactivating commercial SCR catalyst regeneration is proposed. The deactivated commercial SCR catalyst is used as carrier, The manganese oxide (MnO_x) was supported on a carrier to prepare a new denitration catalyst. The fresh catalyst, deactivated catalyst and regenerated catalyst were characterized by XRF, XRD, SEM, XPS and N 2 isothermal adsorption. The results showed that the catalyst prepared by regeneration method was more stable than the deactivated catalyst. The results showed that, when the mass fraction of MnO 2 was 4.67%, the overall physical and chemical properties of the catalyst and the denitrification activity of the catalyst were optimal for the original deactivated catalyst. In addition, the regenerated catalyst can still maintain high denitrification activity at 250 ℃, indicating that the regenerated catalyst has a wider active temperature window. Regenerative catalysts play a catalytic role of non-toxic V2O5 and the load of MnOx. MnOx may bring low temperature activity to the catalyst. At the same time, the catalyst can still maintain high catalytic activity at high space velocity. The regeneration method can not only realize the regeneration of the discarded SCR catalyst, but also improve the catalytic performance of the catalyst.