The desorption and decomposition of trinitrotoluene adsorbed on metal oxide powders |
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| Institution: | 1. Photoactivated Processes Unit, Institute IMDEA Energy, Avda. Ramón de la Sagra 3, 28935 Madrid, Spain;2. Department of Chemical and Energy Technology, ESCET, Rey Juan Carlos University, c/ Tulipán, 28935 Madrid, Spain;3. Thermochemical Processes Unit, Institute IMDEA Energy, Avda. Ramón de la Sagra 3, 28935 Madrid, Spain;4. Institute of Polymer Science and Technology (ICTP-CSIC), c/ Juan de la Cierva 3, 28006 Madrid, Spain;5. ALBA Synchrotron Light Source, Carrer de la Llum 2–26, Cerdanyola del Vallès, 08290 Barcelona, Spain;6. Repsol Technology Lab, c/ Agustín de Betancourt s/n, 28935 Madrid, Spain;1. National Institute of Agronomic Research Regional Center of Errachidia, Morocco;2. Biochemistry of Natural Products Team, Faculty of Sciences and Techniques Errachidia, Morocco;3. Faculty of Medicine and Pharmacy, Fes, Morocco;4. Laboratory of Biotechnology and Sustainable Development of Natural Ressources, Polydisciplinary Faculty, Sultan Moulay Slimane University, Beni Mellal, Morocco;1. Department of Geography and Geology, University of Salzburg, Salzburg, Austria;2. Institute of Earth and Environmental Sciences - Geology, University of Freiburg, Freiburg, Germany;3. Department of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland |
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| Abstract: | The desorption and decomposition of TNT on Al2O3, TiO2, α-ZrO2, α-Fe2O3, SiO2 and MgO were studied in UHV by temperature programmed desorption (TPD) and Auger electron spectroscopy (AES). The metal oxide powders ranged in surface character from acidic (alumina) to basic (magnesia). TNT dosed at 110 K on each oxide gave a molecular TNT TPD peak between 285 and 300 K (multilayer desorption). Chemisorbed TNT decomposed completely on Al2O3, TiO2, α-Fe2O3, and MgO. The decomposition products consisted mainly of CO, CO2, HCN, NO and H2O identified by TPD, and surface carbon and nitrogen residues identified by AES. No TNT decomposition was observed on SiO2 (neutral). Chemisorbed TNT desorbed from SiO2 in a single peak at about 350 K. Silica samples that were hydrated by exposure to an ambient atmosphere at 298 K adsorbed about 4 times more TNT at 298 K than did samples that were dehydrated in UHV. TPD results indicate than the enhancement in TNT adsorption was directly proportional to the concentration of molecularly adsorbed water on the silica surface. |
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