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Registro Completo |
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Biblioteca(s): |
Embrapa Agropecuária Oeste; Embrapa Clima Temperado; Embrapa Meio-Norte; Embrapa Pecuária Sul; Embrapa Suínos e Aves; Embrapa Unidades Centrais; Embrapa Uva e Vinho. |
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Data corrente: |
09/01/2009 |
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Data da última atualização: |
28/05/2009 |
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Autoria: |
COLLE, C. A. |
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Título: |
Negociações multilaterais e políticas agrícolas dos Estados Unidos, União Européia e Brasil. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Porto Alegre: EMATER-RS: ASCAR, 2008. |
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Páginas: |
167 p. |
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Série: |
(Série realidade rural, 51). |
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Idioma: |
Português |
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Conteúdo: |
Principais barreiras ao comércio internacional; Evolução das negociações ao comércio mundial (GATT e OMC); Descrição e análise e análise das políticas agrícolas - Política agrícola americana (FARM BILL); Política agrícola na União Européia; Política agrícola no Brasil; Negociações internacionais e impactos na agricultura; Considerações finais. |
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Palavras-Chave: |
Brasil; Comércio internacional; Estados Unidos; União Européia. |
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Thesagro: |
Crédito Rural; Política Agrícola. |
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Thesaurus Nal: |
agribusiness. |
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Categoria do assunto: |
--
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 00997nam a2200217 a 4500
001 1240473
005 2009-05-28
008 2008 bl uuuu 00u1 u #d
100 1 $aCOLLE, C. A.
245 $aNegociações multilaterais e políticas agrícolas dos Estados Unidos, União Européia e Brasil.
260 $aPorto Alegre: EMATER-RS: ASCAR$c2008
300 $a167 p.
490 $a(Série realidade rural, 51).
520 $aPrincipais barreiras ao comércio internacional; Evolução das negociações ao comércio mundial (GATT e OMC); Descrição e análise e análise das políticas agrícolas - Política agrícola americana (FARM BILL); Política agrícola na União Européia; Política agrícola no Brasil; Negociações internacionais e impactos na agricultura; Considerações finais.
650 $aagribusiness
650 $aCrédito Rural
650 $aPolítica Agrícola
653 $aBrasil
653 $aComércio internacional
653 $aEstados Unidos
653 $aUnião Européia
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Registro original: |
Embrapa Agropecuária Oeste (CPAO) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
02/10/2023 |
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Data da última atualização: |
02/10/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
SILVA, R. M. e; SOUZA, F. L.; DIAS, E.; SILVA, G. T. S. T. da; DÚRAN, F. E.; REGO, A.; HIGGINS, D.; RIBEIRO, C. |
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Afiliação: |
Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada; Department of Chemistry and Molecular Physics, Institute of Chemistry of Sao Carlos, University of Sao Paulo, Brazil; Department of Chemistry and Molecular Physics, Institute of Chemistry of Sao Carlos, University of Sao Paulo, Brazil; Interdisciplinary Laboratory of Electrochemistry and Ceramics, Department of Chemistry, Federal University of Sao Carlos; Department of Fuel and Hydrogen Cells, Nuclear and Energy Research Institute; Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada; Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada; CAUE RIBEIRO DE OLIVEIRA, CNPDIA. |
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Título: |
The role of TiO2:SnO2 heterojunction for partial oxidation of methane by photoelectrocatalytic process at room temperature. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Journal of Alloys and Compounds, v. 968, 172090, 2023. |
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Páginas: |
7 p. |
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ISSN: |
0925-8388 |
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DOI: |
https://doi.org/10.1016/j.jallcom.2023.172090 |
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Idioma: |
Inglês |
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Conteúdo: |
hane into hydrocarbons using photoelectrochemical routes is attractive from a sustainability point of view owing to the possibility of using renewable energy (i.e., solar illumination) to activate this stable molecule. However, the process demands the development of novel catalysts that can promote methane activation and oxidation in a controlled manner to increase energy conversion efficiency. Herein, we demonstrated that semiconductor heterostructures improved charge separation compared to the individual materials alone. A more effortless transfer between bands favors the separation of the electron-hole (e− /h+) pairs generated by the photoelectrocatalytic system and prevents them from recombining. This process produces reactive oxygens, essential to driving methane oxidation conversion of the C?H bond cleavage. TiO2:SnO2 semiconductor heterojunction catalysts in film shape were investigated for methane oxidation via a photoelectrocatalytic process. The methane oxidation reactions were carried out in an inflow and sealed electrochemical system for 1 h. Liquid-state nuclear magnetic resonance revealed methanol and acetic acid as the main liquid products, where the TiO2:SnO2 heterojunction exhibited better performance with values of 30 and 8 µmol. cm− 2 .h− 1 , respectively. Compared to their materials alone, the superior performance of the TiO2:SnO2 heterojunction is attributed to the formation of heterostructure type II that enables a more effortless transfer between bands, facilitating the separation of the generated e− /h+ pairs under UV-Vis irradiation. The outcomes achieved here will motivate further studies for developing semiconductor heterojunction structure catalysts in photoelectrocatalysis to partially oxidize methane into valuable chemicals. Menoshane into hydrocarbons using photoelectrochemical routes is attractive from a sustainability point of view owing to the possibility of using renewable energy (i.e., solar illumination) to activate this stable molecule. However, the process demands the development of novel catalysts that can promote methane activation and oxidation in a controlled manner to increase energy conversion efficiency. Herein, we demonstrated that semiconductor heterostructures improved charge separation compared to the individual materials alone. A more effortless transfer between bands favors the separation of the electron-hole (e− /h+) pairs generated by the photoelectrocatalytic system and prevents them from recombining. This process produces reactive oxygens, essential to driving methane oxidation conversion of the C?H bond cleavage. TiO2:SnO2 semiconductor heterojunction catalysts in film shape were investigated for methane oxidation via a photoelectrocatalytic process. The methane oxidation reactions were carried out in an inflow and sealed electrochemical system for 1 h. Liquid-state nuclear magnetic resonance revealed methanol and acetic acid as the main liquid products, where the TiO2:SnO2 heterojunction exhibited better performance with values of 30 and 8 µmol. cm− 2 .h− 1 , respectively. Compared to their materials alone, the superior performance of the TiO2:SnO2 heterojunction is attributed to the formation of heterostructure type II that enables a more effortless tran... Mostrar Tudo |
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Palavras-Chave: |
CH4 oxidation; Methane oxidation; Photoelectrocatalysis; TiO2 SnO2 heterojunction. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02695naa a2200289 a 4500
001 2157017
005 2023-10-02
008 2023 bl uuuu u00u1 u #d
022 $a0925-8388
024 7 $ahttps://doi.org/10.1016/j.jallcom.2023.172090$2DOI
100 1 $aSILVA, R. M. e
245 $aThe role of TiO2$bSnO2 heterojunction for partial oxidation of methane by photoelectrocatalytic process at room temperature.$h[electronic resource]
260 $c2023
300 $a7 p.
520 $ahane into hydrocarbons using photoelectrochemical routes is attractive from a sustainability point of view owing to the possibility of using renewable energy (i.e., solar illumination) to activate this stable molecule. However, the process demands the development of novel catalysts that can promote methane activation and oxidation in a controlled manner to increase energy conversion efficiency. Herein, we demonstrated that semiconductor heterostructures improved charge separation compared to the individual materials alone. A more effortless transfer between bands favors the separation of the electron-hole (e− /h+) pairs generated by the photoelectrocatalytic system and prevents them from recombining. This process produces reactive oxygens, essential to driving methane oxidation conversion of the C?H bond cleavage. TiO2:SnO2 semiconductor heterojunction catalysts in film shape were investigated for methane oxidation via a photoelectrocatalytic process. The methane oxidation reactions were carried out in an inflow and sealed electrochemical system for 1 h. Liquid-state nuclear magnetic resonance revealed methanol and acetic acid as the main liquid products, where the TiO2:SnO2 heterojunction exhibited better performance with values of 30 and 8 µmol. cm− 2 .h− 1 , respectively. Compared to their materials alone, the superior performance of the TiO2:SnO2 heterojunction is attributed to the formation of heterostructure type II that enables a more effortless transfer between bands, facilitating the separation of the generated e− /h+ pairs under UV-Vis irradiation. The outcomes achieved here will motivate further studies for developing semiconductor heterojunction structure catalysts in photoelectrocatalysis to partially oxidize methane into valuable chemicals.
653 $aCH4 oxidation
653 $aMethane oxidation
653 $aPhotoelectrocatalysis
653 $aTiO2 SnO2 heterojunction
700 1 $aSOUZA, F. L.
700 1 $aDIAS, E.
700 1 $aSILVA, G. T. S. T. da
700 1 $aDÚRAN, F. E.
700 1 $aREGO, A.
700 1 $aHIGGINS, D.
700 1 $aRIBEIRO, C.
773 $tJournal of Alloys and Compounds$gv. 968, 172090, 2023.
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