Gas-phase Dehydration of Glycerol over Supported Silicotungstic Acids Catalysts

Bulletin of the Korean chemical society

Kwang Deog Jung¹  Eun Duck Park¹  Yong Tae Kim¹ 

关键词: Dehydration;    Glycerol;    Acrolein;    Silicotungstic acids;    Acidity;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

The gas-phase dehydration of glycerol to acrolein was carried out over 10 wt % HSiW catalysts supported on different supports, viz. �?-Al₂O₃, SiO₂-Al₂O₃, TiO₂, ZrO₂, SiO₂, AC, CeO₂ and MgO. The same reaction was also conducted over each support without HSiW for comparison. Several characterization techniques, N₂-physisorption, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), the temperature-programmed desorption of ammonia (NH₃- 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 ^oC 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/ZrO₂ and HSiW/SiO₂-Al₂O₃ showed the highest acrolein selectivity. In the case of HSiW/ZrO₂, the initial catalytic activity was recovered after the removal of the accumulated carbon species at 550 ^oC in the presence of oxygen.

【 授权许可】

Unknown