Revealing the Impact of SO₂ on the DeNOₓ Properties of K/Co₃MgMnAlOx

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F25%3A10259363" target="_blank" >RIV/61989100:27710/25:10259363 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.ntnu.edu/web/europacat2025/day-plan" target="_blank" >https://www.ntnu.edu/web/europacat2025/day-plan</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Revealing the Impact of SO₂ on the DeNOₓ Properties of K/Co₃MgMnAlOx

Popis výsledku v původním jazyce

Poster - EUROPACAT 2025 conference. 31.8.-5.9.2025 Trondheim, NorwayBackground and motivation. Nitric oxide together with NO2 are known as NOx, which are mainly produced by anthropogenic activities (combustion of fossil fuels in cars and industry) and its emissions represent serious environmental problems causing formation of photochemical smog and acid rains. Commonly used methods (selective catalytic reduction and selective non-catalytic reduction) are effective, however, reducing agent (NH3, urea) is needed. Co-based mixed oxides catalysts modified by K were found to be active in direct NO decomposition in inert conditions [1-3] producing N2 and O2 as the final products. Up to now, large number of studies about NO direct catalytic decomposition has been published [4], however, there is a lack of those describing the effect of coexisting gases (O2, CO2, H2O or SO2). In our previous research we described the effect of O2 [2], CO2 and water vapour [3], in this study, we have focused on the effect of SO2 on the structural and deNOx properties of K/Co3MgMnAlOx.Materials and methods: Co3MgMnAlOx catalyst with Co:Mg:Mn:Al molar ratio 3:1:1:1 was prepared by co-precipitation method with following wetness impregnation with 3 wt.% of potassium [3]. Catalytic tests were performed in tubular stainless-steel reactor with din = 6 mm using 1000 ppm NO + 100 ppm SO2 + N2 (balanced) with the flow rate of 50 ml/min. The FTIR was used for the gas analysis. For the characterization of physico-chemical properties, the AAS, XPS, NO-TPD, CO2-TPD and EXAFS/XANES were used.Results and discussion. SO2 adsorbs on the catalyst surface and causes slow decrease in catalytic activity. After 38 hours, the catalyst is deactivated (Fig. 1). Part of SO2 stays on the surface after desorption, occupies the active sites and prevents the NO adsorption (Fig. 2) – the deactivation is irreversible at temperature of 700 °C.

Název v anglickém jazyce

Revealing the Impact of SO₂ on the DeNOₓ Properties of K/Co₃MgMnAlOx

Popis výsledku anglicky

Poster - EUROPACAT 2025 conference. 31.8.-5.9.2025 Trondheim, NorwayBackground and motivation. Nitric oxide together with NO2 are known as NOx, which are mainly produced by anthropogenic activities (combustion of fossil fuels in cars and industry) and its emissions represent serious environmental problems causing formation of photochemical smog and acid rains. Commonly used methods (selective catalytic reduction and selective non-catalytic reduction) are effective, however, reducing agent (NH3, urea) is needed. Co-based mixed oxides catalysts modified by K were found to be active in direct NO decomposition in inert conditions [1-3] producing N2 and O2 as the final products. Up to now, large number of studies about NO direct catalytic decomposition has been published [4], however, there is a lack of those describing the effect of coexisting gases (O2, CO2, H2O or SO2). In our previous research we described the effect of O2 [2], CO2 and water vapour [3], in this study, we have focused on the effect of SO2 on the structural and deNOx properties of K/Co3MgMnAlOx.Materials and methods: Co3MgMnAlOx catalyst with Co:Mg:Mn:Al molar ratio 3:1:1:1 was prepared by co-precipitation method with following wetness impregnation with 3 wt.% of potassium [3]. Catalytic tests were performed in tubular stainless-steel reactor with din = 6 mm using 1000 ppm NO + 100 ppm SO2 + N2 (balanced) with the flow rate of 50 ml/min. The FTIR was used for the gas analysis. For the characterization of physico-chemical properties, the AAS, XPS, NO-TPD, CO2-TPD and EXAFS/XANES were used.Results and discussion. SO2 adsorbs on the catalyst surface and causes slow decrease in catalytic activity. After 38 hours, the catalyst is deactivated (Fig. 1). Part of SO2 stays on the surface after desorption, occupies the active sites and prevents the NO adsorption (Fig. 2) – the deactivation is irreversible at temperature of 700 °C.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20400 - Chemical engineering

Projekt

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Návaznosti

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Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů