Some physicochemical properties of Diesel Particulate Matter (DPM) generated by two different engines have been measured and compared with those of a graphitized carbon black. A volumetric method of measuring adsorption isotherms was used to determine BET surface areas and heats of adsorption as a function of surface coverage of selected adsorbates. The effect of various outgassing, or "activation", conditions on the measured properties was investigated. Bulk and true densities of the solids were determined and electron microscopy was used to measure mean particle diameters and external surface areas. Results indicate some similar surface characteristics between carbon black and DPM due to common carbon/hydrogen structures. Significant differences, most notably in adsorption energies, are postulated to be the results of a more heterogeneous surface associated with DPM and the presence of presorbed material.
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