Precursor Effect on Mn-Fe-Ce/TiO<sub>2</sub> Catalysts for Selective Catalytic Reduction of NO with NH<sub>3</sub> at Low Temperatures
Preparation of Mn/TiO<sub>2</sub>, Mn-Fe/TiO<sub>2</sub>, and Mn-Fe-Ce/TiO<sub>2</sub> by the deposition-precipitation (DP) method can afford very active catalysts for low-temperature NH<sub>3</sub>-SCR (selective catalytic reduction of NO with NH<s...
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MDPI AG
2021-02-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/11/2/259 |
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| author | Siva Sankar Reddy Putluru Leonhard Schill Anker Degn Jensen Bernard Siret Frank Tabaries Rasmus Fehrmann |
| author_facet | Siva Sankar Reddy Putluru Leonhard Schill Anker Degn Jensen Bernard Siret Frank Tabaries Rasmus Fehrmann |
| author_sort | Siva Sankar Reddy Putluru |
| collection | DOAJ |
| description | Preparation of Mn/TiO<sub>2</sub>, Mn-Fe/TiO<sub>2</sub>, and Mn-Fe-Ce/TiO<sub>2</sub> by the deposition-precipitation (DP) method can afford very active catalysts for low-temperature NH<sub>3</sub>-SCR (selective catalytic reduction of NO with NH<sub>3</sub>). The effect of precursor choice (nitrate vs. acetate) of Mn, Fe, and Ce on the physiochemical properties including thermal stability and the resulting SCR activity were investigated. The resulting materials were characterized by N<sub>2</sub>-Physisorption, XRD (Powder X-ray diffraction), XPS (X-ray photoelectron spectroscopy), H<sub>2</sub>-TPR (temperature-programmed reduction with hydrogen), and the oxidation of NO to NO<sub>2</sub> measured at 300 °C. Among all the prepared catalysts 5Mn<sub>Ace</sub>/Ti, 25Mn<sub>0.75Ace</sub>Fe<sub>0.25Nit</sub>/Ti, and 25Mn<sub>0.75Ace</sub>Fe<sub>0.20Nit</sub>Ce<sub>0.05Ace</sub>/Ti showed superior SCR activity at low temperature. The superior activity of the latter two materials is likely attributable to the presence of amorphous active metal oxide phases (manganese-, iron- and cerium-oxide) and the ease of the reduction of metal oxides on TiO<sub>2</sub>. Enhanced ability to convert NO to NO<sub>2</sub>, which can promote fast-SCR like pathways, could be another reason. Cerium was found to stabilize amorphous manganese oxide phases when exposed to high temperatures. |
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| spelling | doaj.art-2d9fce6cfd684843832bc4c447b5fe482023-12-11T17:08:34ZengMDPI AGCatalysts2073-43442021-02-0111225910.3390/catal11020259Precursor Effect on Mn-Fe-Ce/TiO<sub>2</sub> Catalysts for Selective Catalytic Reduction of NO with NH<sub>3</sub> at Low TemperaturesSiva Sankar Reddy Putluru0Leonhard Schill1Anker Degn Jensen2Bernard Siret3Frank Tabaries4Rasmus Fehrmann5Center for Catalysis and Sustainable Chemistry, Department of Chemistry, Building 207, Technical University of Denmark, DK-2800 Kgs. Lyngby, DenmarkCenter for Catalysis and Sustainable Chemistry, Department of Chemistry, Building 207, Technical University of Denmark, DK-2800 Kgs. Lyngby, DenmarkCombustion and Harmful Emission Control Research Center, Department of Chemical and Biochemical Engineering, Building 229, Technical University of Denmark, DK-2800 Kgs. Lyngby, DenmarkLAB SA, 259 Avenue Jean Jaurés, 69364 CEDEX 07 Lyon, FranceLAB SA, 259 Avenue Jean Jaurés, 69364 CEDEX 07 Lyon, FranceCenter for Catalysis and Sustainable Chemistry, Department of Chemistry, Building 207, Technical University of Denmark, DK-2800 Kgs. Lyngby, DenmarkPreparation of Mn/TiO<sub>2</sub>, Mn-Fe/TiO<sub>2</sub>, and Mn-Fe-Ce/TiO<sub>2</sub> by the deposition-precipitation (DP) method can afford very active catalysts for low-temperature NH<sub>3</sub>-SCR (selective catalytic reduction of NO with NH<sub>3</sub>). The effect of precursor choice (nitrate vs. acetate) of Mn, Fe, and Ce on the physiochemical properties including thermal stability and the resulting SCR activity were investigated. The resulting materials were characterized by N<sub>2</sub>-Physisorption, XRD (Powder X-ray diffraction), XPS (X-ray photoelectron spectroscopy), H<sub>2</sub>-TPR (temperature-programmed reduction with hydrogen), and the oxidation of NO to NO<sub>2</sub> measured at 300 °C. Among all the prepared catalysts 5Mn<sub>Ace</sub>/Ti, 25Mn<sub>0.75Ace</sub>Fe<sub>0.25Nit</sub>/Ti, and 25Mn<sub>0.75Ace</sub>Fe<sub>0.20Nit</sub>Ce<sub>0.05Ace</sub>/Ti showed superior SCR activity at low temperature. The superior activity of the latter two materials is likely attributable to the presence of amorphous active metal oxide phases (manganese-, iron- and cerium-oxide) and the ease of the reduction of metal oxides on TiO<sub>2</sub>. Enhanced ability to convert NO to NO<sub>2</sub>, which can promote fast-SCR like pathways, could be another reason. Cerium was found to stabilize amorphous manganese oxide phases when exposed to high temperatures.https://www.mdpi.com/2073-4344/11/2/259precursor effectthermal stabilitydeposition-precipitationNH<sub>3</sub>-SCR of NOMnFe/TiO<sub>2</sub> |
| spellingShingle | Siva Sankar Reddy Putluru Leonhard Schill Anker Degn Jensen Bernard Siret Frank Tabaries Rasmus Fehrmann Precursor Effect on Mn-Fe-Ce/TiO<sub>2</sub> Catalysts for Selective Catalytic Reduction of NO with NH<sub>3</sub> at Low Temperatures Catalysts precursor effect thermal stability deposition-precipitation NH<sub>3</sub>-SCR of NO MnFe/TiO<sub>2</sub> |
| title | Precursor Effect on Mn-Fe-Ce/TiO<sub>2</sub> Catalysts for Selective Catalytic Reduction of NO with NH<sub>3</sub> at Low Temperatures |
| title_full | Precursor Effect on Mn-Fe-Ce/TiO<sub>2</sub> Catalysts for Selective Catalytic Reduction of NO with NH<sub>3</sub> at Low Temperatures |
| title_fullStr | Precursor Effect on Mn-Fe-Ce/TiO<sub>2</sub> Catalysts for Selective Catalytic Reduction of NO with NH<sub>3</sub> at Low Temperatures |
| title_full_unstemmed | Precursor Effect on Mn-Fe-Ce/TiO<sub>2</sub> Catalysts for Selective Catalytic Reduction of NO with NH<sub>3</sub> at Low Temperatures |
| title_short | Precursor Effect on Mn-Fe-Ce/TiO<sub>2</sub> Catalysts for Selective Catalytic Reduction of NO with NH<sub>3</sub> at Low Temperatures |
| title_sort | precursor effect on mn fe ce tio sub 2 sub catalysts for selective catalytic reduction of no with nh sub 3 sub at low temperatures |
| topic | precursor effect thermal stability deposition-precipitation NH<sub>3</sub>-SCR of NO MnFe/TiO<sub>2</sub> |
| url | https://www.mdpi.com/2073-4344/11/2/259 |
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