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Title: Evaluation of the acid properties of porous zirconium-doped and undoped silica materials

Abstract

A series of porous silica and Zr-doped silica molecular sieves, belonging to the MCM-41 and MSU families, were prepared and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and N{sub 2} adsorption at 77 K. Their acid properties have been evaluated by NH{sub 3}-TPD, adsorption of pyridine and deuterated acetonitrile coupled to FT-IR spectroscopy and the catalytic tests of isopropanol decomposition and isomerization of 1-butene. The acidity of purely siliceous solids were, in all cases, very low, while the incorporation of Zr(IV) into the siliceous framework produced an enhancement of the acidity. The adsorption of basic probe molecules and the catalytic behaviour revealed that Zr-doped MSU-type silica was more acidic than the analogous Zr-MCM-41 solid, with a similar Zr content. This high acidity observed in the case of Zr-doped silica samples is due to the presence of surface zirconium atoms with a low coordination, mainly creating Lewis acid sites. - Graphical abstract: The adsorption of basic probe molecules and the catalytic behaviour have revealed that MSU-type materials are more acidic than the analogous MCM-41 solids, mainly after the incorporation of zirconium into the silica framework.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2]
  1. Departamento de Quimica Inorganica, Cristalografia y Mineralogia (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Malaga, Campus de Teatinos, 29071 Malaga (Spain)
  2. Instituto de Catalisis y Petroleoquimica, CSIC, c/ Marie Curie 2, Campus Cantoblanco, 28049 Madrid (Spain)
Publication Date:
OSTI Identifier:
20905365
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 179; Journal Issue: 7; Other Information: DOI: 10.1016/j.jssc.2006.04.018; PII: S0022-4596(06)00236-2; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACETONITRILE; ADSORPTION; BUTENES; DOPED MATERIALS; FOURIER TRANSFORMATION; INFRARED SPECTRA; ISOMERIZATION; LEWIS ACIDS; MOLECULAR SIEVES; PH VALUE; POROUS MATERIALS; PYRIDINE; SILICA; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; ZIRCONIUM; ZIRCONIUM OXIDES

Citation Formats

Fuentes-Perujo, D, Santamaria-Gonzalez, J, Merida-Robles, J, Rodriguez-Castellon, E, Jimenez-Lopez, A, Maireles-Torres, P, Moreno-Tost, R, and Mariscal, R. Evaluation of the acid properties of porous zirconium-doped and undoped silica materials. United States: N. p., 2006. Web. doi:10.1016/j.jssc.2006.04.018.
Fuentes-Perujo, D, Santamaria-Gonzalez, J, Merida-Robles, J, Rodriguez-Castellon, E, Jimenez-Lopez, A, Maireles-Torres, P, Moreno-Tost, R, & Mariscal, R. Evaluation of the acid properties of porous zirconium-doped and undoped silica materials. United States. https://doi.org/10.1016/j.jssc.2006.04.018
Fuentes-Perujo, D, Santamaria-Gonzalez, J, Merida-Robles, J, Rodriguez-Castellon, E, Jimenez-Lopez, A, Maireles-Torres, P, Moreno-Tost, R, and Mariscal, R. 2006. "Evaluation of the acid properties of porous zirconium-doped and undoped silica materials". United States. https://doi.org/10.1016/j.jssc.2006.04.018.
@article{osti_20905365,
title = {Evaluation of the acid properties of porous zirconium-doped and undoped silica materials},
author = {Fuentes-Perujo, D and Santamaria-Gonzalez, J and Merida-Robles, J and Rodriguez-Castellon, E and Jimenez-Lopez, A and Maireles-Torres, P and Moreno-Tost, R and Mariscal, R},
abstractNote = {A series of porous silica and Zr-doped silica molecular sieves, belonging to the MCM-41 and MSU families, were prepared and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and N{sub 2} adsorption at 77 K. Their acid properties have been evaluated by NH{sub 3}-TPD, adsorption of pyridine and deuterated acetonitrile coupled to FT-IR spectroscopy and the catalytic tests of isopropanol decomposition and isomerization of 1-butene. The acidity of purely siliceous solids were, in all cases, very low, while the incorporation of Zr(IV) into the siliceous framework produced an enhancement of the acidity. The adsorption of basic probe molecules and the catalytic behaviour revealed that Zr-doped MSU-type silica was more acidic than the analogous Zr-MCM-41 solid, with a similar Zr content. This high acidity observed in the case of Zr-doped silica samples is due to the presence of surface zirconium atoms with a low coordination, mainly creating Lewis acid sites. - Graphical abstract: The adsorption of basic probe molecules and the catalytic behaviour have revealed that MSU-type materials are more acidic than the analogous MCM-41 solids, mainly after the incorporation of zirconium into the silica framework.},
doi = {10.1016/j.jssc.2006.04.018},
url = {https://www.osti.gov/biblio/20905365}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 7,
volume = 179,
place = {United States},
year = {Sat Jul 15 00:00:00 EDT 2006},
month = {Sat Jul 15 00:00:00 EDT 2006}
}