Spectroscopic insights into the role of CO2 on the nature of Cr species in a CrOX/Al2O3 catalysts during ethane dehydrogenation with CO2
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/274714 |
Resumo: | The dehydrogenation of ethane with CO2 was studied on CrOx/Al2O3 catalysts (8 wt% of CrOx) in the 600–675 °C temperature range. The role of CO2 was determined by comparison with catalytic and spectroscopic data of ethane dehydrogenation without CO2. Characterization of fresh catalyst suggested an intimate interaction of Cr and support. Moreover, in situ Raman spectroscopic analysis combined with XPS studies done on reaction exposed samples indicated changes in both the nature of active Cr species and the reaction mechanism depending on the reaction conditions (i.e., presence/absence of CO2, and the reaction temperature). At lower temperatures (600–625 °C), CO2 promotes the re-oxidation of Cr3+ to Cr6+ favoring the oxidative dehydrogenation (ODH) route. While at higher temperatures (650–675 °C), the reaction occurs mainly via a catalytic dehydrogenation mechanism, as CO2 is no longer capable of re-oxidizing Cr3+ to Cr6+, with CO2 inhibiting partially the formation of coke. |
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Franceschini, Gustavo do NascimentoConcepción Heydorn, PatriciaSchwaab, MarcioRangel, Maria do CarmoMartínez-Triguero, J.López Nieto, José Manuel2024-04-12T06:21:00Z20231873-3875http://hdl.handle.net/10183/274714001200382The dehydrogenation of ethane with CO2 was studied on CrOx/Al2O3 catalysts (8 wt% of CrOx) in the 600–675 °C temperature range. The role of CO2 was determined by comparison with catalytic and spectroscopic data of ethane dehydrogenation without CO2. Characterization of fresh catalyst suggested an intimate interaction of Cr and support. Moreover, in situ Raman spectroscopic analysis combined with XPS studies done on reaction exposed samples indicated changes in both the nature of active Cr species and the reaction mechanism depending on the reaction conditions (i.e., presence/absence of CO2, and the reaction temperature). At lower temperatures (600–625 °C), CO2 promotes the re-oxidation of Cr3+ to Cr6+ favoring the oxidative dehydrogenation (ODH) route. While at higher temperatures (650–675 °C), the reaction occurs mainly via a catalytic dehydrogenation mechanism, as CO2 is no longer capable of re-oxidizing Cr3+ to Cr6+, with CO2 inhibiting partially the formation of coke.application/pdfengApplied Catalysis A: General. Amsterdam. Vol. 661 (July 2023), art. 119260, p. 1-12EngenhariaCrOx-based catalystsEthane dehydrogenationCarbon dioxide, ethyleneIn situ RamanSpectroscopic insights into the role of CO2 on the nature of Cr species in a CrOX/Al2O3 catalysts during ethane dehydrogenation with CO2Estrangeiroinfo: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:UFRGSTEXT001200382.pdf.txt001200382.pdf.txtExtracted Texttext/plain57974http://www.lume.ufrgs.br/bitstream/10183/274714/2/001200382.pdf.txtd745178c8113ab351c90013941c47921MD52ORIGINAL001200382.pdfTexto completo (inglês)application/pdf5689664http://www.lume.ufrgs.br/bitstream/10183/274714/1/001200382.pdf72561a47b4876b1685d3d80b86fca99bMD5110183/2747142024-04-13 06:44:36.814182oai:www.lume.ufrgs.br:10183/274714Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-04-13T09:44:36Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Spectroscopic insights into the role of CO2 on the nature of Cr species in a CrOX/Al2O3 catalysts during ethane dehydrogenation with CO2 |
title |
Spectroscopic insights into the role of CO2 on the nature of Cr species in a CrOX/Al2O3 catalysts during ethane dehydrogenation with CO2 |
spellingShingle |
Spectroscopic insights into the role of CO2 on the nature of Cr species in a CrOX/Al2O3 catalysts during ethane dehydrogenation with CO2 Franceschini, Gustavo do Nascimento Engenharia CrOx-based catalysts Ethane dehydrogenation Carbon dioxide, ethylene In situ Raman |
title_short |
Spectroscopic insights into the role of CO2 on the nature of Cr species in a CrOX/Al2O3 catalysts during ethane dehydrogenation with CO2 |
title_full |
Spectroscopic insights into the role of CO2 on the nature of Cr species in a CrOX/Al2O3 catalysts during ethane dehydrogenation with CO2 |
title_fullStr |
Spectroscopic insights into the role of CO2 on the nature of Cr species in a CrOX/Al2O3 catalysts during ethane dehydrogenation with CO2 |
title_full_unstemmed |
Spectroscopic insights into the role of CO2 on the nature of Cr species in a CrOX/Al2O3 catalysts during ethane dehydrogenation with CO2 |
title_sort |
Spectroscopic insights into the role of CO2 on the nature of Cr species in a CrOX/Al2O3 catalysts during ethane dehydrogenation with CO2 |
author |
Franceschini, Gustavo do Nascimento |
author_facet |
Franceschini, Gustavo do Nascimento Concepción Heydorn, Patricia Schwaab, Marcio Rangel, Maria do Carmo Martínez-Triguero, J. López Nieto, José Manuel |
author_role |
author |
author2 |
Concepción Heydorn, Patricia Schwaab, Marcio Rangel, Maria do Carmo Martínez-Triguero, J. López Nieto, José Manuel |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Franceschini, Gustavo do Nascimento Concepción Heydorn, Patricia Schwaab, Marcio Rangel, Maria do Carmo Martínez-Triguero, J. López Nieto, José Manuel |
dc.subject.por.fl_str_mv |
Engenharia |
topic |
Engenharia CrOx-based catalysts Ethane dehydrogenation Carbon dioxide, ethylene In situ Raman |
dc.subject.eng.fl_str_mv |
CrOx-based catalysts Ethane dehydrogenation Carbon dioxide, ethylene In situ Raman |
description |
The dehydrogenation of ethane with CO2 was studied on CrOx/Al2O3 catalysts (8 wt% of CrOx) in the 600–675 °C temperature range. The role of CO2 was determined by comparison with catalytic and spectroscopic data of ethane dehydrogenation without CO2. Characterization of fresh catalyst suggested an intimate interaction of Cr and support. Moreover, in situ Raman spectroscopic analysis combined with XPS studies done on reaction exposed samples indicated changes in both the nature of active Cr species and the reaction mechanism depending on the reaction conditions (i.e., presence/absence of CO2, and the reaction temperature). At lower temperatures (600–625 °C), CO2 promotes the re-oxidation of Cr3+ to Cr6+ favoring the oxidative dehydrogenation (ODH) route. While at higher temperatures (650–675 °C), the reaction occurs mainly via a catalytic dehydrogenation mechanism, as CO2 is no longer capable of re-oxidizing Cr3+ to Cr6+, with CO2 inhibiting partially the formation of coke. |
publishDate |
2023 |
dc.date.issued.fl_str_mv |
2023 |
dc.date.accessioned.fl_str_mv |
2024-04-12T06:21:00Z |
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/10183/274714 |
dc.identifier.issn.pt_BR.fl_str_mv |
1873-3875 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001200382 |
identifier_str_mv |
1873-3875 001200382 |
url |
http://hdl.handle.net/10183/274714 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Applied Catalysis A: General. Amsterdam. Vol. 661 (July 2023), art. 119260, p. 1-12 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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UFRGS |
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Repositório Institucional da UFRGS |
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Repositório Institucional da UFRGS |
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