Influence of Structure-modifying Agents in the Synthesis of Zr-doped SBA-15 Silica and Their Use as Catalysts in the Furfural Hydrogenation to Obtain High Value-added Products through the Meerwein-Ponndorf-Verley Reduction

Zr-doped mesoporous silicas with different textural parameters have been synthesized in the presence of structure-modifying agents, and then characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N<sub>2</sub> adsorption-desorption at &#8722;196 &#176;C...

Full description

Bibliographic Details
Main Authors: Raquel López-Asensio, Carmen Pilar Jiménez Gómez, Cristina García Sancho, Ramón Moreno-Tost, Juan Antonio Cecilia, Pedro Maireles-Torres
Format: Article
Language:English
Published: MDPI AG 2019-02-01
Series:International Journal of Molecular Sciences
Subjects:
Online Access:https://www.mdpi.com/1422-0067/20/4/828
Description
Summary:Zr-doped mesoporous silicas with different textural parameters have been synthesized in the presence of structure-modifying agents, and then characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N<sub>2</sub> adsorption-desorption at &#8722;196 &#176;C, NH<sub>3</sub> thermoprogrammed desorption (NH<sub>3</sub>&#8315;TPD), CO<sub>2</sub> thermoprogrammed desorption (CO<sub>2</sub>&#8315;TPD), and X-ray photoelectron spectroscopy (XPS). These porous materials were evaluated in the furfural hydrogenation through the Meerwein-Ponndorf-Verley (MPV) reaction. The catalytic results indicate that the catalyst synthesized under hydrothermal conditions and adding a pore expander agent is more active and selective to furfuryl alcohol. However, the Zr-doped porous silica catalysts that were synthesized at room temperature, which possess narrow pore sizes, tend to form <i>i</i>-propyl furfuryl and difurfuryl ethers, coming from etherification between furfuryl alcohol (FOL) and isopropanol molecules (used as H-donor) by a S<sub>N</sub>2 mechanism.
ISSN:1422-0067