Physico-chemical characterization of crystalline phases in fly ashes |
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Authors: | Paoletti Luigi Diociaiuti Marco Gianfagna Antonio Viviano Giuseppe |
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Institution: | (1) Laboratorio di Ultrastrutture, Istituto Superiore di Sanità, V.le Regina Elena 299, I-00161 Roma, Italy;(2) Laboratorio di Igiene Ambientale, Istituto Superiore di Sanità, V.le Regina Elena 299, I-00161 Roma, Italy;(3) Dipartimento di Scienze della Terra, Università La Sapienza , P.le Aldo Moro, I-00100 Roma, Italy |
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Abstract: | Fuel oil combustion in power plants, domestic heating systems and diesel engines, causes the emission in the environment of particles with a typical structure and composition: the cenospheres.These particles are produced during the microdrop fuel oil combustion, when air and fuel are injected into the combustion chamber; they have a spheroidal morphology and a spongy structure.Cenospheres are constituted by an amorphous component rich in C, S, Si, Fe and Al; phases composed by microcrystals of sulphates, oxides and pure metallic elements or their alloys, are frequently present in the cenospheres.These crystalline phases are important from environmental and toxicological points of view both because they are composed of heavy metals, and because they can play an important role in heterogeneous catalysis.We started to study these crystalline phases by analytical electron microscopy techniques and electron energy loss spectrometry to define and characterise their structure and composition. |
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Keywords: | analytical electron microscopy fuel oil combustion particulate emissions microcrystalline phases |
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