English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/8907
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Citado 35 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)

PMo or PW heteropoly acids supported on MCM-41 silica nanoparticles: Characterisation and FT-IR study of the adsorption of 2-butanol

Autor Carriazo, Daniel ; Domingo, Concepción ; Martín, Cristina; Rives, Vicente
Palabras clave Hetero-polyoxometalates
Decomposition of 2-butanol
FT-IR spectroscopy
Fecha de publicación 10-may-2008
Citación Journal of Solid State Chemistry 181(8): 2046-2057 (2008)
ResumenMesoporous silica, prepared in basic conditions, has been loaded (20% weight) with 12-molybdophosphoric (PMo) or 12-tungstophosphoric (PW) acid and calcined at different temperatures ranging between 250 and 550°C. The samples have been characterised by N2 adsorption–desorption at −196°C, transmission electron microscopy (TEM), powder X-ray diffraction (PXRD), UV–visible diffuse reflectance, Raman spectroscopy and temperature programmed reduction (TPR). The acidity and catalytic activity have been, respectively, examined by monitoring the adsorption of pyridine and 2-butanol by FT-IR spectroscopy. The results indicate that PW and PMo acids are highly dispersed on mesoporous silica MCM-41 spherical nanoparticles. While PMo retains its Keggin structure up to 550°C, PW decomposes at this temperature into crystalline WO3 and phosphorous oxides. In both cases, the morphology, hexagonal symmetry and long-range order observed for the support are preserved with calcination up to 450°C. The Brönsted-type acid sites found in all samples, whose surface concentration decreases as the calcination temperature increases, are responsible for the selective formation of cis-butene detected upon adsorption of 2-butanol. The sample containing PW calcined at 450°C also shows selectivity to methyl ethyl ketone.
Descripción 12 pages, 13 figures.-- Printed version published on Aug 2008.
Versión del editorhttp://dx.doi.org/10.1016/j.jssc.2008.05.004
URI http://hdl.handle.net/10261/8907
Aparece en las colecciones: (CFMAC-IEM) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Mostrar el registro completo

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.