碱金属对Fe-Mn /TiO2催化剂NH3-SCR性能的影响及其机理

IF 1.6 4区 工程技术 Q3 ENGINEERING, CHEMICAL
Dr. Lixing Zhang, Prof. Lisi Liang, Dr. Hongyue Ma, Dr. Jin Chen, Dr. Yi Li, Dr. Zhongyi Cui
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引用次数: 0

摘要

本文的目的是研究碱金属对Fe-Mn /TiO2催化剂NH3-SCR性能的影响及其在30-170℃下的中毒机理。采用浸渍法制备了无中毒、不同种类碱金属中毒和不同钾含量中毒的催化剂。活性试验表明,Na、Ca和K中毒可导致不同程度的催化剂失活。表征分析表明,碱金属中毒降低了催化剂的比表面积和孔径,降低了表面活性组分Mnn+、Fen+和(Oα)的含量,降低了Mnn+和Fe3+的还原能力。机理分析表明,K会降低催化剂表面路易斯酸位点的反应活性,从而导致L-H和E-R机制下的脱硝反应强度降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Alkali Metal on NH3-SCR Performance of Fe–Mn/TiO2 Catalyst and Its Mechanism

Effect of Alkali Metal on NH3-SCR Performance of Fe–Mn/TiO2 Catalyst and Its Mechanism

The aim of this article is to investigate the effect of alkali metals on the NH3-SCR performance of Fe–Mn/TiO2 catalysts and the poisoning mechanism at 30–170 °C. The catalysts without poisoning, with different kinds of alkali metal poisoning, and with different potassium content poisoning were prepared by impregnation method. The activity tests showed that Na, Ca, and K poisoning could lead to different degrees of catalyst deactivation. Characterization analyses showed that alkali metal poisoning decreases the catalyst specific surface area and pore size, reduces the content of surface–active components Mnn+, Fen+, and (Oα), and reduces the reduction capacity of Mnn+ and Fe3+. Mechanism analysis showed that K would reduce the reactivity of Lewis acid sites on the catalyst surface, thus leading to a decrease in the intensity of denitrification reactions conducted via the L–H and E–R mechanisms.

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来源期刊
Chemical Engineering & Technology
Chemical Engineering & Technology 工程技术-工程:化工
CiteScore
3.80
自引率
4.80%
发文量
315
审稿时长
5.5 months
期刊介绍: This is the journal for chemical engineers looking for first-hand information in all areas of chemical and process engineering. Chemical Engineering & Technology is: Competent with contributions written and refereed by outstanding professionals from around the world. Essential because it is an international forum for the exchange of ideas and experiences. Topical because its articles treat the very latest developments in the field.
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