Thermal behaviour of ground and unground acid leached vermiculite

0379819 - ÚACH 2013 RIV HU eng J - Článek v odborném periodiku
Pérez-Maqueda, L. A. - Maqueda, C. - Pérez-Rodríguez, J. L. - Šubrt, Jan - Černý, Zbyněk - Balek, V.
Thermal behaviour of ground and unground acid leached vermiculite.
Journal of Thermal Analysis and Calorimetry. Roč. 107, č. 2 (2012), s. 431-438. ISSN 1388-6150. E-ISSN 1588-2926
Grant CEP: GA MŠMT LC523
Výzkumný záměr: CEZ:AV0Z40320502
Klíčová slova: vermiculite * grinding * acid leaching * DTA * TG * EGA * emanation thermal analysis
Kód oboru RIV: CA - Anorganická chemie
Impakt faktor: 1.982, rok: 2012

Acid leaching of vermiculite is an interesting procedure to prepare high surface area porous silica. Thermal behaviour of unground and ground vermiculite leached with HCl solutions has been studied by TG, DTA, ETA and high temperature XRD. Important differences have been observed in the thermal behaviour of unground and ground vermiculite after the acid treatments. Thus, for the acid-treated unground vermiculite, dehydrated vermiculite, enstatite and cristobalite were formed during the heating, while for the acid-treated ground vermiculite only iron oxides and cristobalite phases were observed. Structural modifications due to acid treatment were responsible for changes in the transport properties determined by ETA for the vermiculite samples.
Trvalý link: http://hdl.handle.net/11104/0216941