caa a22 4500 46319165X CHVBK 20180406164911.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10973-006-7562-x doi (NATIONALLICENCE)springer-10.1007/s10973-006-7562-x Thermal decomposition of the composite hydrotalcites of iowaite and woodallite [Elektronische Daten] [Jocelyn Bouzaid, R. Frost, W. Martens] The thermal stability and thermal decomposition pathways for synthesized composite iowaite/woodallite have been determined using thermogravimetry analysis in conjunction with evolved gas mass spectrometry. Dehydration of the hydrotalcites occurred over a range of 56-70°C. The first dehydroxylation step occurred at around 255°C and, with the substitution of more iron(III) for chromium(III) this temperature increased to an upper limit of 312°C. This trend was observed throughout all decomposition steps. The release of carbonate ions as carbon dioxide gas initialised at just above 300°C and was always accompanied by loss of hydroxyl units as water molecules. The initial loss of the anion in this case the chloride ion was consistently observed to occur at about 450°C with final traces evolved at 535 to 780°C depending of the Fe:Cr ratio and was detected as HCl (m/z=36). Thus for this to occur, hydroxyl units must have been retained in the structure at temperatures upwards of 750°C. Experimentally it was found difficult to keep CO2 from reacting with the compounds and in this way the synthesized iowaite-woodallite series somewhat resembled the natural minerals. Springer Science+Business Media LLC, 2007 dehydration nationallicence dehydroxylation nationallicence hydrotalcite nationallicence iowaite nationallicence thermogravimetric analysis nationallicence woodallite nationallicence Bouzaid Jocelyn Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box 2434, 4001, Brisbane, Queensland, Australia aut Frost R. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box 2434, 4001, Brisbane, Queensland, Australia aut Martens W. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box 2434, 4001, Brisbane, Queensland, Australia aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/2(2007-08-01), 511-519 1388-6150 89:2<511 2007 89 10973 https://doi.org/10.1007/s10973-006-7562-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7562-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bouzaid Jocelyn Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box 2434, 4001, Brisbane, Queensland, Australia aut NATIONALLICENCE 700 1- Frost R. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box 2434, 4001, Brisbane, Queensland, Australia aut NATIONALLICENCE 700 1- Martens W. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box 2434, 4001, Brisbane, Queensland, Australia aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/2(2007-08-01), 511-519 1388-6150 89:2<511 2007 89 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer