Journal
CATALYSIS TODAY
Volume 150, Issue 1-2, Pages 67-70Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2009.05.016
Keywords
Activated carbon; DRIFTS; TPD; Oxygen surface groups
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The aim of this investigation is to quantify surface oxygen groups on an activated carbon by combining the results from temperature programmed desorption (TPD) and diffuse reflectance FT-IR spectroscopy (DRIFTS). A commercial activated carbon was oxidized with ozone to form surface oxygen groups. Afterwards the samples were heated in TPD experiments up to 500 degrees C. The evolved gases were detected and quantified via IR spectroscopy and DRIFT spectra were collected from the heat-treated samples. Simulation of the DRIFT spectra with a set of Gauss functions led to identification of four surface oxygen groups in the range of 1500-1950 cm(-1). Specific concentrations of the four groups can be calculated with the conversion factors obtained by combining TPD and DRIFTS information. (C) 2009 Elsevier B.V. All rights reserved.
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