De Pietri Tonelli, Davide
(2019)
Produzione e caratterizzazione di compositi a base geopolimerica per l’assorbimento di anidride carbonica.
[Laurea magistrale], Università di Bologna, Corso di Studio in
Chimica industriale [LM-DM270]
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Abstract
In this Thesis, new geopolymer composites loaded with mixed oxides obtained by calcination at 500 °C of commercial hydrotalcites (HTs) were studied for the adsorption of CO2 in the temperature range 200 – 400 ° C. The HTs have been already investigated for the CO2 capture at intermediate temperatures, but being in a powdery form, they require the addition of binders to increase the mechanical properties, but worsening the chemical properties and the adsorption capacity. The geopolymeric mixture was chosen as a "green" bonding matrix since the synthesis is water-based and occurs at low temperature. The commercial HTs, the mixed oxides used as filler and the corresponding composites were fully characterized, determining also the CO2 absorption capacity. It has been shown that both HTs and mixed oxides (Mg-Al-O) obtained by calcination differ in term of structure and composition; furthermore, it was highlighted as the HT absorption capacity did not remain unchanged in the composite materials, depending on the mixed oxide - geopolymer matrix interaction, that may cause a deactivation of the sites involved in the adsorption. The most promising composites resulted to be those loaded with 28 wt.% of calcined Pural 50 and Pural 70 (Sasol, D). Depending on the larger sizes, the mixed oxide particles remained unchanged within the geopolymeric matrix giving adsorption capacity values comparable with the calcined HT, furthermore allowing an easy casting of the materials and high compressive strength values (23-25 MPa).
Abstract
In this Thesis, new geopolymer composites loaded with mixed oxides obtained by calcination at 500 °C of commercial hydrotalcites (HTs) were studied for the adsorption of CO2 in the temperature range 200 – 400 ° C. The HTs have been already investigated for the CO2 capture at intermediate temperatures, but being in a powdery form, they require the addition of binders to increase the mechanical properties, but worsening the chemical properties and the adsorption capacity. The geopolymeric mixture was chosen as a "green" bonding matrix since the synthesis is water-based and occurs at low temperature. The commercial HTs, the mixed oxides used as filler and the corresponding composites were fully characterized, determining also the CO2 absorption capacity. It has been shown that both HTs and mixed oxides (Mg-Al-O) obtained by calcination differ in term of structure and composition; furthermore, it was highlighted as the HT absorption capacity did not remain unchanged in the composite materials, depending on the mixed oxide - geopolymer matrix interaction, that may cause a deactivation of the sites involved in the adsorption. The most promising composites resulted to be those loaded with 28 wt.% of calcined Pural 50 and Pural 70 (Sasol, D). Depending on the larger sizes, the mixed oxide particles remained unchanged within the geopolymeric matrix giving adsorption capacity values comparable with the calcined HT, furthermore allowing an easy casting of the materials and high compressive strength values (23-25 MPa).
Tipologia del documento
Tesi di laurea
(Laurea magistrale)
Autore della tesi
De Pietri Tonelli, Davide
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
CHIMICA INDUSTRIALE
Ordinamento Cds
DM270
Parole chiave
geopolimeri argille anioniche di tipo idrotalcite materiali compositi assorbimento di CO2
Data di discussione della Tesi
22 Marzo 2019
URI
Altri metadati
Tipologia del documento
Tesi di laurea
(NON SPECIFICATO)
Autore della tesi
De Pietri Tonelli, Davide
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
CHIMICA INDUSTRIALE
Ordinamento Cds
DM270
Parole chiave
geopolimeri argille anioniche di tipo idrotalcite materiali compositi assorbimento di CO2
Data di discussione della Tesi
22 Marzo 2019
URI
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