Competitive Adsorption of NOx and Ozone on the Catalyst Surface of Ozone Converters
Four catalysts—1%Pd-2%Mn/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>, 1%Pd/<inlin...
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| Format: | Article |
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MDPI AG
2022-07-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/12/7/738 |
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| author | Xiaolong Ji Jean-Marc Clacens Fabien Can Antoinette Boréave Laurent Veyre Sonia Gil Valérie Meille |
| author_facet | Xiaolong Ji Jean-Marc Clacens Fabien Can Antoinette Boréave Laurent Veyre Sonia Gil Valérie Meille |
| author_sort | Xiaolong Ji |
| collection | DOAJ |
| description | Four catalysts—1%Pd-2%Mn/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>, 1%Pd/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>, 2%Mn/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>—were synthesized via a sol–gel method and characterized using various techniques to evaluate their physicochemical, textural, surface and acidic properties. They were used in the catalytic transformation of ozone and nitrogen oxides using in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) analysis. Different consecutive gas sequences were followed to unravel the poisoning role of nitrogen oxides and the possible reactivation by ozone. It has been proven that on palladium and manganese-based catalysts, the inhibition effect of nitrogen oxides was due to the formation of monodentate nitrites, monodentate, bidentate and bridged nitrates, which are difficult to desorb and decompose into gaseous NOx, either by oxidation or by thermal treatment. Interestingly, monodentate nitrites could be eliminated if the catalyst went through a co-adsorption of NOx and ozone prior to exposure in clean ozone flow. This transformation could be the reason why the catalytic conversion of ozone could return to its original value before the poison effect of nitrogen oxides. |
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| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-09T03:35:16Z |
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| spelling | doaj.art-244ab0c5a24749c7a7e7630e54e236752023-12-03T14:48:52ZengMDPI AGCatalysts2073-43442022-07-0112773810.3390/catal12070738Competitive Adsorption of NOx and Ozone on the Catalyst Surface of Ozone ConvertersXiaolong Ji0Jean-Marc Clacens1Fabien Can2Antoinette Boréave3Laurent Veyre4Sonia Gil5Valérie Meille6Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 69626 Villeurbanne, FranceInstitut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285, Université de Poitiers-CNRS, 4 Rue Michel Brunet, BP633, CEDEX, 86022 Poitiers, FranceInstitut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285, Université de Poitiers-CNRS, 4 Rue Michel Brunet, BP633, CEDEX, 86022 Poitiers, FranceUniv Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 69626 Villeurbanne, FranceLaboratory of Catalysis, Polymerization, Processes and Materials, CP2M UMR 5128 CNRS-UCB Lyon 1-CPE Lyon, CPE Lyon 43 Bd du 11 Novembre 1918, Institut de Chimie de Lyon, Université de Lyon, 69616 Villeurbanne, FranceUniv Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 69626 Villeurbanne, FranceUniv Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 69626 Villeurbanne, FranceFour catalysts—1%Pd-2%Mn/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>, 1%Pd/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>, 2%Mn/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>—were synthesized via a sol–gel method and characterized using various techniques to evaluate their physicochemical, textural, surface and acidic properties. They were used in the catalytic transformation of ozone and nitrogen oxides using in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) analysis. Different consecutive gas sequences were followed to unravel the poisoning role of nitrogen oxides and the possible reactivation by ozone. It has been proven that on palladium and manganese-based catalysts, the inhibition effect of nitrogen oxides was due to the formation of monodentate nitrites, monodentate, bidentate and bridged nitrates, which are difficult to desorb and decompose into gaseous NOx, either by oxidation or by thermal treatment. Interestingly, monodentate nitrites could be eliminated if the catalyst went through a co-adsorption of NOx and ozone prior to exposure in clean ozone flow. This transformation could be the reason why the catalytic conversion of ozone could return to its original value before the poison effect of nitrogen oxides.https://www.mdpi.com/2073-4344/12/7/738NOxDRIFTSozonecompetitioncatalytic converters |
| spellingShingle | Xiaolong Ji Jean-Marc Clacens Fabien Can Antoinette Boréave Laurent Veyre Sonia Gil Valérie Meille Competitive Adsorption of NOx and Ozone on the Catalyst Surface of Ozone Converters Catalysts NOx DRIFTS ozone competition catalytic converters |
| title | Competitive Adsorption of NOx and Ozone on the Catalyst Surface of Ozone Converters |
| title_full | Competitive Adsorption of NOx and Ozone on the Catalyst Surface of Ozone Converters |
| title_fullStr | Competitive Adsorption of NOx and Ozone on the Catalyst Surface of Ozone Converters |
| title_full_unstemmed | Competitive Adsorption of NOx and Ozone on the Catalyst Surface of Ozone Converters |
| title_short | Competitive Adsorption of NOx and Ozone on the Catalyst Surface of Ozone Converters |
| title_sort | competitive adsorption of nox and ozone on the catalyst surface of ozone converters |
| topic | NOx DRIFTS ozone competition catalytic converters |
| url | https://www.mdpi.com/2073-4344/12/7/738 |
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