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Catalysts 2019, 9(4), 349; https://doi.org/10.3390/catal9040349

A Review of Low Temperature NH3-SCR for Removal of NOx

1
Chemical Engineering, College of Engineering and Applied Science, University of Cincinnati, Cincinnati, OH 45221-0012, USA
2
Cummins Inc., Columbus, IN 47201, USA
3
Catalysis and Fine Chemicals Department, CSIR-Indian Institute of Chemical Technology (IICT), Uppal Road, Hyderabad, Telangana 500007, India
*
Author to whom correspondence should be addressed.
Received: 6 March 2019 / Revised: 3 April 2019 / Accepted: 4 April 2019 / Published: 10 April 2019
(This article belongs to the Special Issue Emissions Control Catalysis)

Abstract

The importance of the low-temperature selective catalytic reduction (LT-SCR) of NOx by NH3 is increasing due to the recent severe pollution regulations being imposed around the world. Supported and mixed transition metal oxides have been widely investigated for LT-SCR technology. However, these catalytic materials have some drawbacks, especially in terms of catalyst poisoning by H2O or/and SO2. Hence, the development of catalysts for the LT-SCR process is still under active investigation throughout seeking better performance. Extensive research efforts have been made to develop new advanced materials for this technology. This article critically reviews the recent research progress on supported transition and mixed transition metal oxide catalysts for the LT-SCR reaction. The review covered the description of the influence of operating conditions and promoters on the LT-SCR performance. The reaction mechanism, reaction intermediates, and active sites are also discussed in detail using isotopic labelling and in situ FT-IR studies. View Full-Text
Keywords: low-temperature selective catalytic reduction; NH3-SCR; de-NOx catalysis; SO2/H2O tolerance; transition metal-based catalysts low-temperature selective catalytic reduction; NH3-SCR; de-NOx catalysis; SO2/H2O tolerance; transition metal-based catalysts
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Damma, D.; Ettireddy, P.R.; Reddy, B.M.; Smirniotis, P.G. A Review of Low Temperature NH3-SCR for Removal of NOx. Catalysts 2019, 9, 349.

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