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Multi-stage ammonia production for sorption selective catalytic reduction of NOx

Multi-stage ammonia production for sorption selective catalytic reduction of NOx Sorption selective catalytic reduction of nitrogen oxides (NOx) (sorption-SCR) has ever been proposed for replacing commercial urea selective catalytic reduction of NOx (urea-SCR), while only the single-stage sorption cycle is hitherto adopted for sorption-SCR. Herein, various multi-stage ammonia production cycles is built to solve the problem of relative high starting temperature with ammonia transfer (AT) unit and help detect the remaining ammonia in ammonia storage and delivery system (ASDS) with ammonia warning (AW) unit. Except for the singlestage ammonia production cycle with MnCl2, other sorption-SCR strategies all present overwhelming advantages over urea-SCR considering the much higher NOx conversion driven by the heat source lower than 100°C and better matching characteristics with low-temperature catalysts. Furthermore, the required mass of sorbent for each type of sorption-SCR is less than half of the mass of AdBlue for urea-SCR. Therefore, the multifunctional multi-stage sorption-SCR can realize compact and renewable ammonia storage and delivery with low thermal energy consumption and high NOx conversion, which brings a bright potential for efficient commercial de-NOx technology. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Frontiers in Energy Springer Journals

Multi-stage ammonia production for sorption selective catalytic reduction of NOx

Frontiers in Energy , Volume OnlineFirst – Jan 1, 2022

Multi-stage ammonia production for sorption selective catalytic reduction of NOx

Front. Energy https://doi.org/10.1007/s11708-021-0797-1 RESEARCH ARTICLE Chen ZHANG, Guoliang AN, Liwei WANG, Shaofei WU Multi-stage ammonia production for sorption selective catalytic reduction of NO © Higher Education Press 2021 Abstract Sorption selective catalytic reduction of nitro- acid rain, photochemical smog, greenhouse effects, and gen oxides (NO ) (sorption-SCR) has ever been proposed PM [1,2]. It has been reported that with increasing x 2.5 for replacing commercial urea selective catalytic reduction oxygen concentration or increasing temperature the of NO (urea-SCR), while only the single-stage sorption emissions of NO increase, while higher SO levels x x 2 cycle is hitherto adopted for sorption-SCR. Herein, various decrease the emissions of NO but increase the proportion multi-stage ammonia production cycles is built to solve the of CO [3]. To tackle the emission of NO from gasoline and problem of relative high starting temperature with diesel engines, governments worldwide enact increasingly ammonia transfer (AT) unit and help detect the remaining stringent policies and legislations. However, there is a ammonia in ammonia storage and delivery system (ASDS) growing disparity between real-world emissions and with ammonia warning (AW) unit. Except for the single- tightened standards, such as Euro VI for European Union stage ammonia production cycle with MnCl ,other (EU), Low Emission Vehicle (LEV) III for the USA, and sorption-SCR strategies all present overwhelming advan- CN VI for China [4,5]. The ever-increasing demand for air tages over urea-SCR considering the much higher NO purification has created strong momentum for addressing conversion driven by the heat source lower than 100°C and NO emissions originated from automobiles. better matching characteristics with low-temperature As a large-scale applied NO reduction technology, catalysts. Furthermore, the required mass of sorbent for selective catalytic reduction of NO (SCR)...
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Publisher
Springer Journals
Copyright
Copyright © Higher Education Press 2021
ISSN
2095-1701
eISSN
2095-1698
DOI
10.1007/s11708-021-0797-1
Publisher site
See Article on Publisher Site

Abstract

Sorption selective catalytic reduction of nitrogen oxides (NOx) (sorption-SCR) has ever been proposed for replacing commercial urea selective catalytic reduction of NOx (urea-SCR), while only the single-stage sorption cycle is hitherto adopted for sorption-SCR. Herein, various multi-stage ammonia production cycles is built to solve the problem of relative high starting temperature with ammonia transfer (AT) unit and help detect the remaining ammonia in ammonia storage and delivery system (ASDS) with ammonia warning (AW) unit. Except for the singlestage ammonia production cycle with MnCl2, other sorption-SCR strategies all present overwhelming advantages over urea-SCR considering the much higher NOx conversion driven by the heat source lower than 100°C and better matching characteristics with low-temperature catalysts. Furthermore, the required mass of sorbent for each type of sorption-SCR is less than half of the mass of AdBlue for urea-SCR. Therefore, the multifunctional multi-stage sorption-SCR can realize compact and renewable ammonia storage and delivery with low thermal energy consumption and high NOx conversion, which brings a bright potential for efficient commercial de-NOx technology.

Journal

Frontiers in EnergySpringer Journals

Published: Jan 1, 2022

Keywords: selective catalytic reduction (SCR); nitrogen oxides (NOx); ammonia; composite sorbent; chemisorption

References