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Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization
dc.contributor.author | Alvarez, Mayra G |
dc.contributor.author | Chimentao, Ricardo J |
dc.contributor.author | Tichit, D. |
dc.contributor.author | Santos, Jeannette B O |
dc.contributor.author | Dafinov, Antonio |
dc.contributor.author | Modesto Lopez, Luis B |
dc.contributor.author | Rosell Llompart, Joan |
dc.contributor.author | Gueell, E. J. |
dc.contributor.author | Gispert Guirado, Francesc |
dc.contributor.author | Llorca Piqué, Jordi |
dc.contributor.author | Medina Mena, Francisco |
dc.contributor.other | Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques |
dc.date.accessioned | 2015-12-02T12:50:13Z |
dc.date.available | 2018-01-02T01:30:54Z |
dc.date.issued | 2016-01-01 |
dc.identifier.citation | Alvarez, M., Chimentao, R., Tichit, D., Santos, J., Dafinov, A., Modesto, L., Rosell, J., Gueell, E., Gispert, F., Llorca, J., Medina, F. Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization. "Microporous and mesoporous materials", 01 Gener 2016, vol. 219, p. 19-28. |
dc.identifier.issn | 1387-1811 |
dc.identifier.uri | http://hdl.handle.net/2117/80115 |
dc.description.abstract | Aluminum was incorporated into SBA-15 supports at molar ratios Si/Al = 10 and 2 by the pH-adjusting method. The calcined mesoporous Al-SBA-15 supports, as well as the Al-free SBA-15 support, were impregnated with ammonium paratungstate ((NH4)(10)center dot[H2W12O42]center dot 4H(2)O) aqueous solution. Tungsten carbide (W2C) was synthesized by temperature programmed carburization (TPC) from the. WO3 supported on AI-SBA-15 and SBA-15 in a flow of CH4/H-2. These resultant materials were characterized by powder X-ray diffraction (XRD), N-2 adsorption/desorption, Al-27 NMR and Raman spectroscopies, and transmission electron microscopies (TEM and HRTEM). W2C species were obtained after the carburization process in all the materials. The mesoporous structure of the SBA-15 supports was preserved at all synthesis steps. XRD and TEM analyses revealed that the introduction of aluminum species into the SBA-15 greatly enhanced the dispersion of WO3 and W2C phases during the calcination and carburization steps, respectively. In situ XRD measured during the carburization in a synchrotron facility provided further details of the reduction of tungsten trioxide species as a function of temperature. The presence of aluminum in the SBA-15 notably affected the distribution and the reduction temperature of the tungsten oxide species. (C) 2015 Elsevier Inc. All rights reserved. |
dc.format.extent | 10 p. |
dc.language.iso | eng |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Enginyeria dels materials |
dc.subject | Àrees temàtiques de la UPC::Enginyeria química::Indústries químiques |
dc.subject.lcsh | X-rays - Diffraction |
dc.subject.lcsh | Aluminum |
dc.subject.other | Tungsten carbide |
dc.subject.other | Mesoporous silica |
dc.subject.other | SBA-15 |
dc.subject.other | Al-SBA-15 |
dc.subject.other | Natural-gas lng |
dc.subject.other | Hydrogen-production |
dc.subject.other | Raman-spectroscopy |
dc.subject.other | Catalysts |
dc.subject.other | Silica |
dc.subject.other | Molybdenum |
dc.subject.other | Crystal |
dc.subject.other | Alumina |
dc.title | Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization |
dc.type | Article |
dc.subject.lemac | Raigs X--Difracció |
dc.subject.lemac | Alumini |
dc.contributor.group | Universitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia |
dc.identifier.doi | 10.1016/j.micromeso.2015.07.018 |
dc.rights.access | Open Access |
local.identifier.drac | 17238822 |
dc.description.version | Postprint (author's final draft) |
local.citation.author | Alvarez, M.; Chimentao, R.; Tichit, D.; Santos, J.; Dafinov, A.; Modesto, L.; Rosell, J.; Gueell, E.; Gispert, F.; Llorca, J.; Medina, F. |
local.citation.publicationName | Microporous and mesoporous materials |
local.citation.volume | 219 |
local.citation.startingPage | 19 |
local.citation.endingPage | 28 |
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