基于失活商业脱硝催化剂制备的再生SCR催化剂性能研究

发布时间：2018-06-13 22:43

  本文选题：燃煤电厂 + 失活商业SCR催化剂　； 参考：《中国电机工程学报》2017年09期

【摘要】：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。
[Abstract]:In order to solve the problem of deactivating commercial SCR catalyst in coal-fired power plant and to make full use of the low temperature activity of mn based SCR catalyst, a new method for regeneration of deactivated commercial SCR catalyst was put forward: deactivated commercial SCR catalyst was used as the carrier, and the deactivated commercial SCR catalyst was used as the carrier. A new catalyst for denitrification was prepared by means of multi-step impregnation method, which was supported on the support of manganese oxide (MNO _ x). The fresh catalyst, deactivated catalyst and regenerated catalyst were characterized by XRF DX SEMX XPS and N\ -2 isothermal adsorption techniques in order to explore the change of the catalyst prepared by the regeneration method compared with the deactivated catalyst. The results showed that the comprehensive physical and chemical properties of the catalyst and the denitrification activity of the catalyst were the best when the loading mass fraction of MNO _ 2 was 4.67 for the original deactivated catalyst. In addition, the regenerated catalyst can still maintain higher denitrification activity at 250 鈩，

本文编号：2015781