Sastre Calabuig, F.; Corma Canós, A.; García Gómez, H. (2012). 185 Nm Photoreduction of CO2 to methane by water. Influence of the Presence of a Basic catalyst. Journal of the American Chemical Society. 134(34):14137-14141. doi:10.1021/ja304930t
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/63176
Title:
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185 Nm Photoreduction of CO2 to methane by water. Influence of the Presence of a Basic catalyst
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Author:
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Sastre Calabuig, Francesc
Corma Canós, Avelino
García Gómez, Hermenegildo
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UPV Unit:
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Universitat Politècnica de València. Departamento de Química - Departament de Química
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Issued date:
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Abstract:
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Photolysis of CO2 at 185 nm using a Hg lamp in the presence of H-2 or H2O leads to the formation of CH4 (after an induction period) and a lesser amount of CO. Using H-2 gas as reducing agent, up to 40% conversion was ...[+]
Photolysis of CO2 at 185 nm using a Hg lamp in the presence of H-2 or H2O leads to the formation of CH4 (after an induction period) and a lesser amount of CO. Using H-2 gas as reducing agent, up to 40% conversion was achieved with almost complete selectivity to methane and energy consumption of 1.55 Gcal/mol. When CO2 irradiation is carried out in the gas phase in the presence of H2O, both reagents can undergo photolysis, and H-2 generation from water is a competing process accompanying the formation of CO and CH4 (CO2 conversion 0.67% at 14 h). For the irradiation of CO2 using H2O as reducing agent, basic solids (K+-exchanged Y zeolite or hydrotalcites) can increase CO2 conversion up to 2.21% with total selectivity toward CH4 and an energy consumption of 4.5 Gcal/mol. This result opens a door in the quest for efficient photocatalysts that could further increase the apparent quantum yield of the process, particularly at longer wavelengths.
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Subjects:
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DEEP-UV PHOTOLYSIS
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PHOTOCATALYTIC REDUCTION
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SOLAR FUELS
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ARTIFICIAL PHOTOSYNTHESIS
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CARBON-DIOXIDE
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ANIONIC CLAYS
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ZEOLITES
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CONVERSION
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ADSORPTION
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HYDROGEN
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Copyrigths:
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Cerrado |
Source:
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Journal of the American Chemical Society. (issn:
0002-7863
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DOI:
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10.1021/ja304930t
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Publisher:
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American Chemical Society
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Publisher version:
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http://dx.doi.org/10.1021/ja304930t
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Project ID:
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Spanish Ministry of Economy and Competitivity CTQ-2009-11586
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Thanks:
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Financial support by the Spanish Ministry of Economy and Competitivity (CTQ-2009-11586) is gratefully acknowledged.
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Type:
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Artículo
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