Year: 2010
Type: article
Abstract: The gas-phase dehydration of glycerol to acrolein was carried out over 10 wt % HSiW catalysts supported on different supports, viz. $\gamma-Al_2O_3$ , $SiO_2-Al_2O_3$ , $TiO_2$ , $ZrO_2$ , $SiO_2$ , AC, $CeO_2$ and MgO. The same reaction was also conducted over each support without HSiW for comparison. Several characterization techniques, $N_2$ -physisorption, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), the temperature-programmed desorption of ammonia ( $NH_3$ -TPD), temperature-programmed oxidation (TPO) with mass spectroscopy and CHNS analysis were employed to characterize the catalysts. The glycerol conversion generally increased with increasing amount of acid sites. Ceria showed the highest 1-hydroxyacetone selectivity at $315^{\circ}C$ among the various metal oxides. The supported HSiW catalyst showed superior catalytic activity to that of the corresponding support. Among the supported HSiW catalysts, HSiW/ $ZrO_2$ and HSiW/ $SiO_2-Al_2O_3$ showed the highest acrolein selectivity. In the case of HSiW/ $ZrO_2$ , the initial catalytic activity was recovered after the removal of the accumulated carbon species at $550^{\circ}C$ in the presence of oxygen.
Authors: Yong-Tae Kim, Kwang-Deog Jung, Eun-Duck Park
Institutions: Ajou University, Korea Institute of Science and Technology
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
Award: G3449891379
OpenAlex ID: W1989134520