Co-doped SrTiO3 as a catalyst for environmental catalysis

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Co-doped SrTiO3 as a catalyst for environmental catalysis

Popis výsledku v původním jazyce

This conntribution was presented on 15th Pannonian International Symposium on Catalysis. In the last two decades, perovskite materials have become the subject of intensive research, mainly due to the possibility of introducing into their structure atoms of elements other than native ones (mainly d-electron metals). The effect of such a procedure is not only a change in the electrical properties of perovskite materials, but can also the induction of the catalytic activity of the material. The aim of the research was to obtain materials based on cobaltdoped strontium titanate and to test these materials in terms of structural (XRD), microstructural (SEM, BET analysis) properties and the potential to participate in oxidation and reduction reactions (TPR/TPOx). As shown by the research carried out so far, the use of non-stoichiometry in the strontium sublattice should support the introduction of a dopant into the titanium sublattice in SrTiO3 structure. For this reason, both the stoichiometric material SrTi0.98Co0.02O3 as well as systems with assumed non-stoichiometry - Sr0.95Ti0.98Co0.02O3 and Sr0.9Ti0.9Co0.1O3 were obtained by modified Pechini method and examined. XRD analysis showed that SrTi0.98Co0.02O3 and Sr0.95Ti0.98Co0.02O3 materials are single-phase (contain only tausonite) while Sr0.9Ti0.9Co0.1O3 sample also contain small amount of Co3O4. However, temperature range of reduction effects (TPR/TPOx analysis) shows the presence of cobalt oxides in all three systems. The specific surface areas of the materials are small, in the range of 4-13 m2 g-1.The materials were tested for the catalytic activity of the systems in the temperature range 250-350 oC in the following reactions: selective catalytic reduction of NOx by ammonia (NH3-SCR), selective catalytic oxidation of ammonia (NH3-SCO) and NO direct decomposition reaction (NO-DDR). Catalytic tests indicate the lack of catalytic activity of the tested systems in the NO-DDR reaction. In the case of the NH3-SCR reaction, only Sr0.95Ti0.98Co0.02O3 material shows some catalytic activity, while the highest catalytic activity is shown by these materials in the ammonia oxidation reaction. In the case of the NH3-SCO reaction, Sr0.95Ti0.98Co0.02O3 sample also shows the highest selectivity to nitrogen.The results of the conducted research indicate that materials with the assumed nonstoichiometry in strontium sublattices exhibited better catalytic properties than stoichiometric material both in the NH3-SCR reaction and in the NH3-SCO reaction however, only the latter process is worth considering from the point of view of the application of the tested systems as a catalyst.

Název v anglickém jazyce

Co-doped SrTiO3 as a catalyst for environmental catalysis

Popis výsledku anglicky

This conntribution was presented on 15th Pannonian International Symposium on Catalysis. In the last two decades, perovskite materials have become the subject of intensive research, mainly due to the possibility of introducing into their structure atoms of elements other than native ones (mainly d-electron metals). The effect of such a procedure is not only a change in the electrical properties of perovskite materials, but can also the induction of the catalytic activity of the material. The aim of the research was to obtain materials based on cobaltdoped strontium titanate and to test these materials in terms of structural (XRD), microstructural (SEM, BET analysis) properties and the potential to participate in oxidation and reduction reactions (TPR/TPOx). As shown by the research carried out so far, the use of non-stoichiometry in the strontium sublattice should support the introduction of a dopant into the titanium sublattice in SrTiO3 structure. For this reason, both the stoichiometric material SrTi0.98Co0.02O3 as well as systems with assumed non-stoichiometry - Sr0.95Ti0.98Co0.02O3 and Sr0.9Ti0.9Co0.1O3 were obtained by modified Pechini method and examined. XRD analysis showed that SrTi0.98Co0.02O3 and Sr0.95Ti0.98Co0.02O3 materials are single-phase (contain only tausonite) while Sr0.9Ti0.9Co0.1O3 sample also contain small amount of Co3O4. However, temperature range of reduction effects (TPR/TPOx analysis) shows the presence of cobalt oxides in all three systems. The specific surface areas of the materials are small, in the range of 4-13 m2 g-1.The materials were tested for the catalytic activity of the systems in the temperature range 250-350 oC in the following reactions: selective catalytic reduction of NOx by ammonia (NH3-SCR), selective catalytic oxidation of ammonia (NH3-SCO) and NO direct decomposition reaction (NO-DDR). Catalytic tests indicate the lack of catalytic activity of the tested systems in the NO-DDR reaction. In the case of the NH3-SCR reaction, only Sr0.95Ti0.98Co0.02O3 material shows some catalytic activity, while the highest catalytic activity is shown by these materials in the ammonia oxidation reaction. In the case of the NH3-SCO reaction, Sr0.95Ti0.98Co0.02O3 sample also shows the highest selectivity to nitrogen.The results of the conducted research indicate that materials with the assumed nonstoichiometry in strontium sublattices exhibited better catalytic properties than stoichiometric material both in the NH3-SCR reaction and in the NH3-SCO reaction however, only the latter process is worth considering from the point of view of the application of the tested systems as a catalyst.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20700 - Environmental engineering

Projekt

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Návaznosti

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Rok uplatnění

2022

Kód důvěrnosti údajů

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