Determination of active sites during gasification of biomass char with CO2 using temperature-programmed desorption. Part 1: Methodology & desorption spectra

Determination of active sites during gasification of biomass char with CO2 using temperature-programmed desorption. Part 2: Influence of ash components

“…The detailed experimental set-up and procedure, as well as the approach used for the correction of the TPD signals are presented in detail in section 3 of part 1 of the present study [6]. Summarizing, WC1600 is partially gasified in 80 vol-% CO 2 in Ar at 820 °C up to carbon conversion degrees of 0.25, 0.50, 0.75, 0.90 and 1.…”

“…Cl and S were below detection limits. A detailed description of the production procedure and its characterization is presented in part 1 of the present study [6].…”

“…A methodology for measurement of stable C-O and unstable C(O) complexes based on the temperature-programmed desorption (TPD) technique proposed by Lizzio et al [5] is applied using a beech wood biomass char. An analysis of the obtained CO and CO 2 spectra presented in part 1 [6] shows that the TPD signals are not only a result of decomposition of oxygenated surface complexes followed by desorption of gaseous products but also of decomposition of ash constituents, as both processes yield in oxygenated gases (CO and CO 2 ) during the desorption phase of TPD experiments [5,7].…”

“…Based on the conclusions presented in part 1 of this study [6] this paper concentrates on the analysis of TPD spectra of partially gasified beech wood char samples from the point of view of the influence of its ash components. First, a summary of relevant results presented in literature concerning desorption of oxygenated surface complexes and decomposition of ash components from biomass char and coal char that influence TPD spectra is presented.…”

“…Then, experimental results of TPD of partially gasified samples of a low ash content commercial activated carbon impregnated with the main ash components of the beech wood char under study (Ca and K) is given. The findings are finally applied to the results of TPD spectra obtained for partially gasified samples presented in the first part of this study [6] and conclusions about the influence of decomposition of ash components in the TPD spectra and its relationship to the gasification process are drawn.…”