Influence of Y doping on catalytic activity of CeO2, MnOx, and CeMnOx catalysts for selective catalytic reduction of NO by NH3

doi:10.3390/catal13050901

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DOI Доступ к ресурсу на сайте издателя			10.3390/catal13050901

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Title: Influence of Y doping on catalytic activity of CeO2, MnOx, and CeMnOx catalysts for selective catalytic reduction of NO by NH3
Creator: La Greca, Eleonora
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Kharlamova, Tamara S.
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Grabchenko, Maria V.
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Svetlichnyi, Valerii A.
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Pantaleo, Giuseppe
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Consentino, Luca
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Stonkus, Olga A.
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Vodyankina, Olga V.
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Liotta, Leonarda Francesca
Date: 2023
DOI: 10.3390/catal13050901
Description: Novel yttrium-doped CeO2, MnOx, and CeMnOx composites are investigated as catalysts for low-temperature NH3-SCR. The study involves the preparation of unmodified oxide supports using a citrate method followed by modification with Y (2 wt.%) using two approaches, including the one-pot citrate method and incipient wetness impregnation of undoped oxides. The NH3-SCR reaction is studied in a fixed-bed quartz reactor to test the ability of the prepared catalysts in NO reduction. The gas reaction mixture consists of 800 ppm NO, 800 ppm NH3, 10 vol.% O2, and He as a balance gas at a WHSV of 25,000 mL g−1 h−1. The results indicate that undoped CeMnOx mixed oxide exhibits significantly higher deNOx performance compared with undoped and Y-doped MnOx and CeO2 catalysts. Indeed, yttrium presence in CeMnOx promotes the competitive NH3-SCO reaction, reducing the amount of NH3 available for NO reduction and lowering the catalyst activity. Furthermore, the physical-chemical properties of the prepared catalysts are studied using nitrogen adsorption/desorption, XRD, Raman spectroscopy, temperature-programmed reduction with hydrogen, and temperature-programmed desorption of ammonia. This study presents a promising approach to enhancing the performance of NH3-SCR catalysts at low temperatures that can have significant implications for reducing NO emissions.

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collection(s): Химический факультет | Сибирский физико-технический институт
Identifier: смотреть в электронном каталоге НБ ТГУ
Type: статьи в журналах
Source: Catalysts. 2023. Vol. 13, № 5. P. 901 (1-19)
Language: eng

Created: 16-01-2024

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Сибирский физико-технический институт Influence of Y doping on catalytic activity of CeO2, MnOx, and CeMnOx catalysts for selective catalytic reduction of NO by NH3