Influence of the thermal processing and doping on LaMnO3 and La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites prepared by auto-combustion for removal of VOCs
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/254635 |
Resumo: | Single-phase oxygen stoichiometric LaMnO3 and doped La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites have been prepared by a simple one-step auto-combustion method. Cation-deficient LaMnO3+δ and La0.8A0.2MnO3+δ were obtained by calcination of the former samples in air at 750 ◦C. The samples were characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, temperature-programmed reduction, temperature-programmed oxygen desorption, and N2 ph ysisorption in order to apply them as catalysts in the complete catalytic oxidation of acetone as a model volatile organic compound. The studied phases show the expected orthorhombic and rhombohedral perovskite crystal structures. Catalytic experiments performed with all the samples show measurable activity already at 100 ◦C. At 200 ◦C, doped La0.8A0.2MnO3 samples show higher activity than undoped LaMnO3, with increasing conversion with larger A-cation size. Calcined samples also show higher activity than as-prepared ones making La0.8Ba0.2MnO3+δ the best catalyst at this temperature. All doped samples show >95% acetone conversion at T ≥ 250 ◦C with a weak dependence on the sample processing or A cation doping. The collected evidence confirms that the most important factors for the catalytic activity of these oxides are the Mn4+/Mn3+ molar ratio on the surface of the samples and the cation-deficiency of the bulk perovskite structure. In addition, increasing the symmetry of the bulk crystal structure appears to have an additional favourable effect. Despite the observation of the presence of surface carbonates, we show that it is possible to use the as-prepared samples without further thermal treatment with good results in the oxidation of acetone. |
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Di Benedetto, NatashaDe Los Santos, CarolinaYeste Sigüenza, María Del PilarMorais, JonderAlves, Maria do Carmo MartinsAmaya, AlejandroSuescun, LeopoldoGatica Casas, José ManuelVidal Muñoz, HilarioCastiglioni, Jorge2023-02-10T04:57:42Z20222073-4344http://hdl.handle.net/10183/254635001154775Single-phase oxygen stoichiometric LaMnO3 and doped La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites have been prepared by a simple one-step auto-combustion method. Cation-deficient LaMnO3+δ and La0.8A0.2MnO3+δ were obtained by calcination of the former samples in air at 750 ◦C. The samples were characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, temperature-programmed reduction, temperature-programmed oxygen desorption, and N2 ph ysisorption in order to apply them as catalysts in the complete catalytic oxidation of acetone as a model volatile organic compound. The studied phases show the expected orthorhombic and rhombohedral perovskite crystal structures. Catalytic experiments performed with all the samples show measurable activity already at 100 ◦C. At 200 ◦C, doped La0.8A0.2MnO3 samples show higher activity than undoped LaMnO3, with increasing conversion with larger A-cation size. Calcined samples also show higher activity than as-prepared ones making La0.8Ba0.2MnO3+δ the best catalyst at this temperature. All doped samples show >95% acetone conversion at T ≥ 250 ◦C with a weak dependence on the sample processing or A cation doping. The collected evidence confirms that the most important factors for the catalytic activity of these oxides are the Mn4+/Mn3+ molar ratio on the surface of the samples and the cation-deficiency of the bulk perovskite structure. In addition, increasing the symmetry of the bulk crystal structure appears to have an additional favourable effect. Despite the observation of the presence of surface carbonates, we show that it is possible to use the as-prepared samples without further thermal treatment with good results in the oxidation of acetone.application/pdfengCatalysts. Basel. Vol. 12, no. 8 (Aug. 2022), 865, 18 p.PerovskitaDopagemCatáliseVOCPerovskitesCatalytic oxidationAcetoneAuto-combustion synthesisInfluence of the thermal processing and doping on LaMnO3 and La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites prepared by auto-combustion for removal of VOCsEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001154775.pdf.txt001154775.pdf.txtExtracted Texttext/plain57507http://www.lume.ufrgs.br/bitstream/10183/254635/2/001154775.pdf.txt9849ff685ebb133fa2a7fd4638fb947bMD52ORIGINAL001154775.pdfTexto completo (inglês)application/pdf2038976http://www.lume.ufrgs.br/bitstream/10183/254635/1/001154775.pdf777578a0d0c38151fdc9f7444518917cMD5110183/2546352023-07-19 03:41:29.509925oai:www.lume.ufrgs.br:10183/254635Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-19T06:41:29Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Influence of the thermal processing and doping on LaMnO3 and La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites prepared by auto-combustion for removal of VOCs |
title |
Influence of the thermal processing and doping on LaMnO3 and La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites prepared by auto-combustion for removal of VOCs |
spellingShingle |
Influence of the thermal processing and doping on LaMnO3 and La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites prepared by auto-combustion for removal of VOCs Di Benedetto, Natasha Perovskita Dopagem Catálise VOC Perovskites Catalytic oxidation Acetone Auto-combustion synthesis |
title_short |
Influence of the thermal processing and doping on LaMnO3 and La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites prepared by auto-combustion for removal of VOCs |
title_full |
Influence of the thermal processing and doping on LaMnO3 and La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites prepared by auto-combustion for removal of VOCs |
title_fullStr |
Influence of the thermal processing and doping on LaMnO3 and La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites prepared by auto-combustion for removal of VOCs |
title_full_unstemmed |
Influence of the thermal processing and doping on LaMnO3 and La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites prepared by auto-combustion for removal of VOCs |
title_sort |
Influence of the thermal processing and doping on LaMnO3 and La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites prepared by auto-combustion for removal of VOCs |
author |
Di Benedetto, Natasha |
author_facet |
Di Benedetto, Natasha De Los Santos, Carolina Yeste Sigüenza, María Del Pilar Morais, Jonder Alves, Maria do Carmo Martins Amaya, Alejandro Suescun, Leopoldo Gatica Casas, José Manuel Vidal Muñoz, Hilario Castiglioni, Jorge |
author_role |
author |
author2 |
De Los Santos, Carolina Yeste Sigüenza, María Del Pilar Morais, Jonder Alves, Maria do Carmo Martins Amaya, Alejandro Suescun, Leopoldo Gatica Casas, José Manuel Vidal Muñoz, Hilario Castiglioni, Jorge |
author2_role |
author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Di Benedetto, Natasha De Los Santos, Carolina Yeste Sigüenza, María Del Pilar Morais, Jonder Alves, Maria do Carmo Martins Amaya, Alejandro Suescun, Leopoldo Gatica Casas, José Manuel Vidal Muñoz, Hilario Castiglioni, Jorge |
dc.subject.por.fl_str_mv |
Perovskita Dopagem Catálise |
topic |
Perovskita Dopagem Catálise VOC Perovskites Catalytic oxidation Acetone Auto-combustion synthesis |
dc.subject.eng.fl_str_mv |
VOC Perovskites Catalytic oxidation Acetone Auto-combustion synthesis |
description |
Single-phase oxygen stoichiometric LaMnO3 and doped La0.8A0.2MnO3 (A = Ca, Sr, Ba) perovskites have been prepared by a simple one-step auto-combustion method. Cation-deficient LaMnO3+δ and La0.8A0.2MnO3+δ were obtained by calcination of the former samples in air at 750 ◦C. The samples were characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, temperature-programmed reduction, temperature-programmed oxygen desorption, and N2 ph ysisorption in order to apply them as catalysts in the complete catalytic oxidation of acetone as a model volatile organic compound. The studied phases show the expected orthorhombic and rhombohedral perovskite crystal structures. Catalytic experiments performed with all the samples show measurable activity already at 100 ◦C. At 200 ◦C, doped La0.8A0.2MnO3 samples show higher activity than undoped LaMnO3, with increasing conversion with larger A-cation size. Calcined samples also show higher activity than as-prepared ones making La0.8Ba0.2MnO3+δ the best catalyst at this temperature. All doped samples show >95% acetone conversion at T ≥ 250 ◦C with a weak dependence on the sample processing or A cation doping. The collected evidence confirms that the most important factors for the catalytic activity of these oxides are the Mn4+/Mn3+ molar ratio on the surface of the samples and the cation-deficiency of the bulk perovskite structure. In addition, increasing the symmetry of the bulk crystal structure appears to have an additional favourable effect. Despite the observation of the presence of surface carbonates, we show that it is possible to use the as-prepared samples without further thermal treatment with good results in the oxidation of acetone. |
publishDate |
2022 |
dc.date.issued.fl_str_mv |
2022 |
dc.date.accessioned.fl_str_mv |
2023-02-10T04:57:42Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/254635 |
dc.identifier.issn.pt_BR.fl_str_mv |
2073-4344 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001154775 |
identifier_str_mv |
2073-4344 001154775 |
url |
http://hdl.handle.net/10183/254635 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Catalysts. Basel. Vol. 12, no. 8 (Aug. 2022), 865, 18 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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