English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/206905
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Hydrothermal Synthesis of Ruthenium Nanoparticles with a Metallic Core and a Ruthenium Carbide Shell for Lowerature Activation of CO2 to Methane

AuthorsCored, Jorge; García-Ortiz, Andrea; Iborra Chornet, Sara; Climent Olmedo, María José; Liu, Lichen; Chuang, C. H.; Chang, Shan; Escudero, Carlos; Concepción, Patricia; Corma, Avelino
Issue Date27-Nov-2019
PublisherACS Publications
CitationJournal of the American Chemical Society 141(49): 19304-19311 (2019)
AbstractRuthenium nanoparticles with a core-shell structure formed by a core of metallic ruthenium and a shell of ruthenium carbide have been synthesized by a mild and easy hydrothermal treatment. The dual structure and composition of the nanoparticles have been determined by synchrotron X-ray photoelectron spectroscopy (XPS), near-edge X-ray absorption fine structure (NEXAFS) analysis, and transmission electron microscopy (TEM) imaging. According to depth profile synchrotron XPS and X-ray diffraction (XRD) analysis, metallic ruthenium species predominate in the inner layers of the material, ruthenium carbide species being located on the upper surface layers. The ruthenium carbon catalysts presented herein are able to activate both CO and H, exhibiting exceptional high activity for CO hydrogenation at low temperatures (160-200 °C) with 100% selectivity to methane, surpassing by far the most active Ru catalysts reported up to now. On the basis of catalytic studies and isotopic CO/CO/H experiments, the active sites responsible for this unprecedented activity can be associated with surface ruthenium carbide (RuC) species, which enable CO activation and transformation to methane via a direct CO hydrogenation mechanism. Both the high activity and the absence of CO in the gas effluent confer relevance to these catalysts for the Sabatier reaction, a chemical process with renewed interest for storing surplus renewable energy in the form of methane.
Publisher version (URL)http://dx.doi.org/10.1021/jacs.9b07088
Identifiersdoi: 10.1021/jacs.9b07088
issn: 1520-5126
Appears in Collections:(ITQ) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.