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Title

Bifunctional mechanism of CO2 reduction to CH4 on Ru nanoparticles supported on carbon nanomaterials

AuthorsRoldán, Laura; Marco, Yanila; García-Bordejé, José Enrique
KeywordsHydrogenation
Doping
Nanoparticles
Carbon nanotubes
Carbon nanofibers
Reaction mechanisms
Ruthenium
Issue Date12-Jun-2016
CitationCarboCat VII (2016)
AbstractRenewable energies are one of the energetic solutions for the future, due to the limitation and environmental risk of fossil fuels. Nevertheless, the production of energy from renewable sources is intermittent and is produced far from the places where it is consumed. Therefore, it is urgent developing ways for the storage and transport of this energy. A solution is the conversion of renewable energy in the energetic vector H2. The main problem is its storage and transport since the typical discharge time in the current infrastructures is less than 100 hours.When long time storage is needed, one option is the conversion of H2 with CO2 in synthetic natural gas (CH4), which can be stored in the current infrastructures without limitation. Moreover, if the used CO2 have been previously captured in a power station, it contributes to greenhouse gas abatement. The reaction between CO2 con H2 was discovered more than a century ago. Different transition metal and noble metal supported on different metallic oxides have been used as catalyst. Up to our knowledge, carbon nanomaterials have not been used as catalyst support in this reaction. In fact, there are some reports that CNT are inactive for this reaction, which is attributed to the inertness of the support to chemisorb CO2. Herein, we have supported Ru nanoparticles on carbon nanotubes (CNTs), carbon nanofibers (CNFs) and Nitrogen doped carbon nanofibers (N-CNF). Several Ru loadings (0.5, 2 y 5 wt%) were deposited on CNF and N-CNF by wet impregnation of (Ru(NO)(NO3)). 50 mg of catalyst diluted with SiC was placed in a quartz reactor, reduced at 425 K in H2 and tested at different temperatures with a feed of 60 ml/min of 5 % CO2, 15 % H2 and Ar to balance. The outlet gases were analysed using a Pfeifer mass spectrometer.
Description2 figures.--Work presented at The 7th International Symposium on Carbon for Catalysis, CarboCat VII, "New carbon-based catalytic systems", 12th-17th June 2016, Strasbourg (France).
URIhttp://hdl.handle.net/10261/217820
Appears in Collections:(ICB) Comunicaciones congresos
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