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In Situ Evaluation of Inorganic Matrix Effects on the Partitioning of Three Trace Elements (As, Sb, Se) at the Outset of Coal Combustion

A direct method of assessing the partitioning of semivolatile trace elements (TEs), such as As, Sb, and Se, between the gas and solid phases in the microenvironment of the burning char can be used to gain insight into TE partitioning in coal-fired furnaces. Such a method was developed using a graphite furnace atomic absorption spectrometer (GFAAS) to perform three separate functions simultaneously at high temperature (up to 2800 °C): in situ pyrolysis simulation, sample collection, and analysis. The current study focuses on further developing this method to study the vaporization of TEs entrapped in inorganic inclusions within coal. TEs were introduced into the GFAAS in their water-soluble form, using coal-relevant matrix/TE ratios. This allowed a homogeneous TE distribution within the matrix, which simulated various inclusion forms. Activation energies of the TE atomization were determined with and without these matrices to assess the chemical matrix effects. Several inorganic matrices were shown to alte...

Authors:   Anna A. Raeva; Oleg V. Klykov; Evguenii I. Kozliak; David T. Pierce; Wayne S. Seames
Journal:   Energy & Fuels
Year:   2011
DOI:   10.1021/ef200879j
Publication date:   08-Sep-2011
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