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Consequences of cavity size and palladium addition on the selective hydrogen adsorption in isoreticular metal-organic frameworks

Thermochimica Acta
Publication Date
  • Chemistry


Microsoft Word - THERMAL BEHAVIOUR OF SYNGENITE Am Min.doc 1 THERMAL DECOMPOSITION OF SYNGENITE, K2Ca(SO4)2.H2O: J.Theo Kloprogge1*, Zhe Ding1, Wayde N. Martens1, Roelof D. Schuiling2. Loc V. Duong3 and Ray L. Frost1 1 Inorganic Materials Research Program, Queensland University of Technology, 2 George Street, G.P.O. Box 2434, Brisbane, Qld 4001, Australia 2 Department of Geochemistry, Institute of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, The Netherlands 3 Analytical Electron Microscopy Facility, Faculty of Science, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, Qld 4001, Australia Published as: Kloprogge, J.T., Ding, Z., Martens, W.N., Schuiling, R.D., Duong, L.V. and Frost, R.L. (2004) Thermal decomposition of syngenite, K2Ca(SO4)2.H2O. Thermochimica Acta, 417, 143-155 Note: Manuscript version. Figures in separate file Abstract The thermal decomposition of syngenite, K2Ca(SO4)2.H2O, formed during the treatment of liquid manure has been studied by Thermal Gravimetric Analysis, Differential Scanning Calorimetry, high temperature X-ray diffraction and Infrared Emission Spectroscopy. Gypsum was found as a minor impurity resulting in a minor weight loss due to dehydration around 100°C. The main endothermic dehydration and decomposition stage of syngenite to crystalline K2Ca2(SO4)3 and amorphous K2SO4 is observed around 200°C. The reaction involves a solid-state recrystallization, while water and the K2SO4 diffuse out of the existing lattice. The additional weight loss steps around 250 and 350°C are probably due to presence of larger syngenite particles, which exhibit slower decomposition due to the slower diffusion of water and K2SO4 out of the crystal lattice. A minor endothermic sulphate loss around 450°C is not due to the decomposition of syngenite or its products or of the gypsum impurity. The origin of this sulphate is not clear. Keywords: differential scanning calorimetry, infrar

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