H2O and/or SO2 Tolerance of Cu-Mn/SAPO-34 Catalyst for NO Reduction with NH3 at Low Temperature

A series of molecular sieve catalysts (Cu–Mn/SAPO-34) with different loadings of Cu and Mn components were prepared by the impregnation method. The deNOx activity of the catalyst was investigated during the selective catalytic reduction (SCR) of NO...

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Main Authors:	Guofu Liu, Wenjie Zhang, Pengfei He, Shipian Guan, Bing Yuan, Rui Li, Yu Sun, Dekui Shen
Format:	Article
Language:	English
Published:	MDPI AG 2019-03-01
Series:	Catalysts
Subjects:	SCR Catalyst (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> deNO<i><sub>x</sub></i> H<sub>2</sub>O and SO<sub>2</sub> poisoning
Online Access:	https://www.mdpi.com/2073-4344/9/3/289

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record_format	Article
spelling	doaj-9687d935f75248a6aca13c37572f6f272020-11-24T21:44:27ZengMDPI AGCatalysts2073-43442019-03-019328910.3390/catal9030289catal9030289H<sub>2</sub>O and/or SO<sub>2</sub> Tolerance of Cu-Mn/SAPO-34 Catalyst for NO Reduction with NH<sub>3</sub> at Low TemperatureGuofu Liu0Wenjie Zhang1Pengfei He2Shipian Guan3Bing Yuan4Rui Li5Yu Sun6Dekui Shen7Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210000, ChinaKey Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210000, ChinaJiangsu Frontier Electric Power Technology Co., Ltd., Nanjing 211102, ChinaJiangsu Frontier Electric Power Technology Co., Ltd., Nanjing 211102, ChinaJiangsu Power Design Institute Co., Ltd., Nanjing 210008, ChinaJiangsu Power Design Institute Co., Ltd., Nanjing 210008, ChinaJiangsu Power Design Institute Co., Ltd., Nanjing 210008, ChinaKey Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210000, ChinaA series of molecular sieve catalysts (Cu–Mn/SAPO-34) with different loadings of Cu and Mn components were prepared by the impregnation method. The deNO<i><sub>x</sub></i> activity of the catalyst was investigated during the selective catalytic reduction (SCR) of NO with NH<sub>3</sub> in the temperature range of 120 °C to 330 °C, including the effects of H<sub>2</sub>O vapors and SO<sub>2</sub>. In order to understand the poisoning mechanism by the injection of H<sub>2</sub>O and/or SO<sub>2</sub> into the feeding gas, the characteristics of the fresh and spent catalyst were identified by means of Brunner−Emmet−Teller (BET), X-ray Diffraction (XRD), Scanning Electronic Microscopy (SEM) and Thermal Gravity- Differential Thermal Gravity (TG-DTG). The conversion of NO by the catalyst can achieve at 72% under the reaction temperature of 120 °C, while the value reached more than 90% under the temperature between 180 °C and 330 °C. The deNO<i><sub>x</sub></i> activity test shows that the H<sub>2</sub>O has a reversible negative effect on NO conversion, which is mainly due to the competitive adsorption of H<sub>2</sub>O and NH<sub>3</sub> on Lewis acid sites. When the reaction temperature increases to 300 °C, the poisoning effect of H<sub>2</sub>O can be negligible. The poisoning effect of SO<sub>2</sub> on deNO<i><sub>x</sub></i> activity is dependent on the reaction temperature. At low temperature, the poisoning effect of SO<sub>2</sub> is permanent with no recovery of deNO<i><sub>x</sub></i> activity after the elimination of SO<sub>2</sub>. The formation of (NH4)<sub>2</sub>SO<sub>4</sub>, which results in the plug of active sites and a decrease of surface area, and the competitive adsorption of SO<sub>2</sub> and NO should be responsible for the loss of deNO<i><sub>x</sub></i> activity over Cu/SAPO-34.https://www.mdpi.com/2073-4344/9/3/289SCRCatalyst(NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>deNO<i><sub>x</sub></i>H<sub>2</sub>O and SO<sub>2</sub> poisoning
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Guofu Liu Wenjie Zhang Pengfei He Shipian Guan Bing Yuan Rui Li Yu Sun Dekui Shen
spellingShingle	Guofu Liu Wenjie Zhang Pengfei He Shipian Guan Bing Yuan Rui Li Yu Sun Dekui Shen H<sub>2</sub>O and/or SO<sub>2</sub> Tolerance of Cu-Mn/SAPO-34 Catalyst for NO Reduction with NH<sub>3</sub> at Low Temperature Catalysts SCR Catalyst (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> deNO<i><sub>x</sub></i> H<sub>2</sub>O and SO<sub>2</sub> poisoning
author_facet	Guofu Liu Wenjie Zhang Pengfei He Shipian Guan Bing Yuan Rui Li Yu Sun Dekui Shen
author_sort	Guofu Liu
title	H<sub>2</sub>O and/or SO<sub>2</sub> Tolerance of Cu-Mn/SAPO-34 Catalyst for NO Reduction with NH<sub>3</sub> at Low Temperature
title_short	H<sub>2</sub>O and/or SO<sub>2</sub> Tolerance of Cu-Mn/SAPO-34 Catalyst for NO Reduction with NH<sub>3</sub> at Low Temperature
title_full	H<sub>2</sub>O and/or SO<sub>2</sub> Tolerance of Cu-Mn/SAPO-34 Catalyst for NO Reduction with NH<sub>3</sub> at Low Temperature
title_fullStr	H<sub>2</sub>O and/or SO<sub>2</sub> Tolerance of Cu-Mn/SAPO-34 Catalyst for NO Reduction with NH<sub>3</sub> at Low Temperature
title_full_unstemmed	H<sub>2</sub>O and/or SO<sub>2</sub> Tolerance of Cu-Mn/SAPO-34 Catalyst for NO Reduction with NH<sub>3</sub> at Low Temperature
title_sort	h<sub>2</sub>o and/or so<sub>2</sub> tolerance of cu-mn/sapo-34 catalyst for no reduction with nh<sub>3</sub> at low temperature
publisher	MDPI AG
series	Catalysts
issn	2073-4344
publishDate	2019-03-01
description	A series of molecular sieve catalysts (Cu–Mn/SAPO-34) with different loadings of Cu and Mn components were prepared by the impregnation method. The deNO<i><sub>x</sub></i> activity of the catalyst was investigated during the selective catalytic reduction (SCR) of NO with NH<sub>3</sub> in the temperature range of 120 °C to 330 °C, including the effects of H<sub>2</sub>O vapors and SO<sub>2</sub>. In order to understand the poisoning mechanism by the injection of H<sub>2</sub>O and/or SO<sub>2</sub> into the feeding gas, the characteristics of the fresh and spent catalyst were identified by means of Brunner−Emmet−Teller (BET), X-ray Diffraction (XRD), Scanning Electronic Microscopy (SEM) and Thermal Gravity- Differential Thermal Gravity (TG-DTG). The conversion of NO by the catalyst can achieve at 72% under the reaction temperature of 120 °C, while the value reached more than 90% under the temperature between 180 °C and 330 °C. The deNO<i><sub>x</sub></i> activity test shows that the H<sub>2</sub>O has a reversible negative effect on NO conversion, which is mainly due to the competitive adsorption of H<sub>2</sub>O and NH<sub>3</sub> on Lewis acid sites. When the reaction temperature increases to 300 °C, the poisoning effect of H<sub>2</sub>O can be negligible. The poisoning effect of SO<sub>2</sub> on deNO<i><sub>x</sub></i> activity is dependent on the reaction temperature. At low temperature, the poisoning effect of SO<sub>2</sub> is permanent with no recovery of deNO<i><sub>x</sub></i> activity after the elimination of SO<sub>2</sub>. The formation of (NH4)<sub>2</sub>SO<sub>4</sub>, which results in the plug of active sites and a decrease of surface area, and the competitive adsorption of SO<sub>2</sub> and NO should be responsible for the loss of deNO<i><sub>x</sub></i> activity over Cu/SAPO-34.
topic	SCR Catalyst (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> deNO<i><sub>x</sub></i> H<sub>2</sub>O and SO<sub>2</sub> poisoning
url	https://www.mdpi.com/2073-4344/9/3/289
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H<sub>2</sub>O and/or SO<sub>2</sub> Tolerance of Cu-Mn/SAPO-34 Catalyst for NO Reduction with NH<sub>3</sub> at Low Temperature

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