Glycerol oxidehydration to acrylic acid on complex mixed-metal oxides

Chieregato, Alessandro (2015) Glycerol oxidehydration to acrylic acid on complex mixed-metal oxides, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Chimica, 27 Ciclo. DOI 10.6092/unibo/amsdottorato/6850.
Documenti full-text disponibili:
[img]
Anteprima
Documento PDF (English) - Richiede un lettore di PDF come Xpdf o Adobe Acrobat Reader
Download (5MB) | Anteprima

Abstract

The project of this Ph.D. thesis is based on a co-supervised collaboration between Università di Bologna, ALMA MATER STUDIORUM (Italy) and Instituto de Tecnología Química, Universitat Politècnica de València ITQ-UPV (Spain). This Ph.D. thesis is about the synthesis, characterization and catalytic testing of complex mixed-oxide catalysts mainly related to the family of Hexagonal Tungsten Bronzes (HTBs). These materials have been little explored as catalysts, although they have a great potential as multifunctional materials. Their peculiar acid properties can be coupled to other functionalities (e.g. redox sites) by isomorphous substitution of tungsten atoms with other transition metals such as vanadium, niobium and molybdenum. In this PhD thesis, it was demonstrated how it is possible to prepare substituted-HTBs by hydrothermal synthesis; these mixed-oxide were fully characterize by a number of physicochemical techniques such as XPS, HR-TEM, XAS etc. They were also used as catalysts for the one-pot glycerol oxidehydration to acrylic acid; this reaction might represent a viable chemical route to solve the important issue related to the co-production of glycerin along the biodiesel production chain. Acrylic acid yields as high as 51% were obtained and important structure-reactivity correlations were proved to govern the catalytic performance; only fine tuning of acid and redox properties as well as the in-framework presence of vanadium are fundamental to achieve noteworthy yields into the acid monomer. The overall results reported herein might represent an important contribution for future applications of HTBs in catalysis as well as a general guideline for a multifaceted approach for their physicochemical characterization.

Abstract
Tipologia del documento
Tesi di dottorato
Autore
Chieregato, Alessandro
Supervisore
Co-supervisore
Dottorato di ricerca
Scuola di dottorato
Scienze chimiche
Ciclo
27
Coordinatore
Settore disciplinare
Settore concorsuale
Parole chiave
Hexagonal tungsten bronzes Vanadium Glycerol dehydration and oxidation Biomass Multifunctional catalysts
URN:NBN
DOI
10.6092/unibo/amsdottorato/6850
Data di discussione
14 Aprile 2015
URI

Altri metadati

Statistica sui download

Gestione del documento: Visualizza la tesi

^