Study on the Mechanism of SO2 Poisoning of MnOx/PG for Lower Temperature SCR by Simple Washing Regeneration

Manganese oxide-supported palygorskite (MnOx/PG) catalysts are considered highly efficient for low-temperature SCR of NOx. However, the MnOx/PG catalyst tends to be poisoned by SO2. The effect of SO...

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Autores principales:	Xianlong Zhang, Shiwen Liu, Kang Ma, Yazhong Chen, Shi Jin, Xinyu Wang, Xueping Wu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	low-temperature SCR MnO<sub>x</sub>/PG catalyst SO<sub>2</sub>-pretreated poisoning water-washed regeneration Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/7183cad77f794f51bcf4507b1f74efa6
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spelling	oai:doaj.org-article:7183cad77f794f51bcf4507b1f74efa62021-11-25T17:06:19ZStudy on the Mechanism of SO<sub>2</sub> Poisoning of MnO<sub>x</sub>/PG for Lower Temperature SCR by Simple Washing Regeneration10.3390/catal111113602073-4344https://doaj.org/article/7183cad77f794f51bcf4507b1f74efa62021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1360https://doaj.org/toc/2073-4344Manganese oxide-supported palygorskite (MnO<sub>x</sub>/PG) catalysts are considered highly efficient for low-temperature SCR of NO<sub>x</sub>. However, the MnO<sub>x</sub>/PG catalyst tends to be poisoned by SO<sub>2</sub>. The effect of SO<sub>2</sub> on activity of the SO<sub>2</sub>-pretreated poisoning catalysts under ammonia-free conditions was explored. It was determined that the MnO<sub>x</sub>/PG catalyst tends to be considerably deactivated by SO<sub>2</sub> in the absence of ammonia and that water-washed regeneration can completely recover activity of the deactivated catalyst. Based on these results and characterizations of the catalysts, a reasonable mechanism for the deactivation of MnO<sub>x</sub>/PG catalyst by SO<sub>2</sub> was proposed in this study. SO<sub>2</sub> easily oxidized to SO<sub>3</sub> on the surface of the catalyst, leading to the formation of polysulfuric acid, wrapping of the active component and blocking the micropores. The deactivation of the MnO<sub>x</sub>/PG catalyst is initially caused by the formation of polysulfuric rather than the deposition of ammonia sulfate, which occurs later.Xianlong ZhangShiwen LiuKang MaYazhong ChenShi JinXinyu WangXueping WuMDPI AGarticlelow-temperature SCRMnO<sub>x</sub>/PG catalystSO<sub>2</sub>-pretreated poisoningwater-washed regenerationChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1360, p 1360 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	low-temperature SCR MnO<sub>x</sub>/PG catalyst SO<sub>2</sub>-pretreated poisoning water-washed regeneration Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	low-temperature SCR MnO<sub>x</sub>/PG catalyst SO<sub>2</sub>-pretreated poisoning water-washed regeneration Chemical technology TP1-1185 Chemistry QD1-999 Xianlong Zhang Shiwen Liu Kang Ma Yazhong Chen Shi Jin Xinyu Wang Xueping Wu Study on the Mechanism of SO<sub>2</sub> Poisoning of MnO<sub>x</sub>/PG for Lower Temperature SCR by Simple Washing Regeneration
description	Manganese oxide-supported palygorskite (MnO<sub>x</sub>/PG) catalysts are considered highly efficient for low-temperature SCR of NO<sub>x</sub>. However, the MnO<sub>x</sub>/PG catalyst tends to be poisoned by SO<sub>2</sub>. The effect of SO<sub>2</sub> on activity of the SO<sub>2</sub>-pretreated poisoning catalysts under ammonia-free conditions was explored. It was determined that the MnO<sub>x</sub>/PG catalyst tends to be considerably deactivated by SO<sub>2</sub> in the absence of ammonia and that water-washed regeneration can completely recover activity of the deactivated catalyst. Based on these results and characterizations of the catalysts, a reasonable mechanism for the deactivation of MnO<sub>x</sub>/PG catalyst by SO<sub>2</sub> was proposed in this study. SO<sub>2</sub> easily oxidized to SO<sub>3</sub> on the surface of the catalyst, leading to the formation of polysulfuric acid, wrapping of the active component and blocking the micropores. The deactivation of the MnO<sub>x</sub>/PG catalyst is initially caused by the formation of polysulfuric rather than the deposition of ammonia sulfate, which occurs later.
format	article
author	Xianlong Zhang Shiwen Liu Kang Ma Yazhong Chen Shi Jin Xinyu Wang Xueping Wu
author_facet	Xianlong Zhang Shiwen Liu Kang Ma Yazhong Chen Shi Jin Xinyu Wang Xueping Wu
author_sort	Xianlong Zhang
title	Study on the Mechanism of SO<sub>2</sub> Poisoning of MnO<sub>x</sub>/PG for Lower Temperature SCR by Simple Washing Regeneration
title_short	Study on the Mechanism of SO<sub>2</sub> Poisoning of MnO<sub>x</sub>/PG for Lower Temperature SCR by Simple Washing Regeneration
title_full	Study on the Mechanism of SO<sub>2</sub> Poisoning of MnO<sub>x</sub>/PG for Lower Temperature SCR by Simple Washing Regeneration
title_fullStr	Study on the Mechanism of SO<sub>2</sub> Poisoning of MnO<sub>x</sub>/PG for Lower Temperature SCR by Simple Washing Regeneration
title_full_unstemmed	Study on the Mechanism of SO<sub>2</sub> Poisoning of MnO<sub>x</sub>/PG for Lower Temperature SCR by Simple Washing Regeneration
title_sort	study on the mechanism of so<sub>2</sub> poisoning of mno<sub>x</sub>/pg for lower temperature scr by simple washing regeneration
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7183cad77f794f51bcf4507b1f74efa6
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Study on the Mechanism of SO<sub>2</sub> Poisoning of MnO<sub>x</sub>/PG for Lower Temperature SCR by Simple Washing Regeneration

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