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Hydrothermal synthesis and characterization of kalsilite by using a kaolinitic rock from Sardinia, Italy, and its application in the production of biodiesel

Published online by Cambridge University Press:  28 February 2018

Daniela Novembre*
Affiliation:
Dipartimento di Ingegneria e Geologia, Università degli Studi “G. d'Annunzio”, 66013 Chieti, Italy
Domingo Gimeno
Affiliation:
Dept. de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, 08028 Barcelona, Spain
Nicola d'Alessandro
Affiliation:
Dipartimento di Ingegneria e Geologia, Università degli Studi “G. d'Annunzio”, 66013 Chieti, Italy
Lucia Tonucci
Affiliation:
Dipartimento di Scienze Filosofiche, Pedagogiche ed Economico-Quantitative, Università degli Studi “G. d'Annunzio”, 66013 Chieti, Italy

Abstract

The present work deals with the synthesis of kalsilite using material from a kaolinitic rock outcrop in Romana, Sassary Province, Sardinia, Italy.

The hydrothermal synthesis method required the dissolution of kaolin and Al(OH)3 in a KOH solution at a temperature of 190°C and 1.013 bar. Crystallization of kalsilite was confirmed at 12 h in association with kaliophilite H2 as a metastable phase.

The products of synthesis were fully characterized by powder X-ray diffraction, scanning electron microscopy, inductively coupled plasma optical emission spectrometry, infrared spectroscopy and 29Si nuclear magnetic resonance. The amorphous phase in the synthesis powders was estimated with quantitative phase analysis using the combined Rietveld and reference intensity ratio methods. Cell parameters and density were also calculated for the kalsilite. A potential application of kalsilite was investigated as a heterogeneous catalyst for biodiesel synthesis from sunflower oil used for frying.

Type
Article
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Andrew Christy

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