Ethanol Adsorption and Conversion over Ceria Catalyst System

• Main Author: 廖恆毅
• Other Authors: 張一知
• Format: Others
• Language: en_US
• Online Access: http://ndltd.ncl.edu.tw/handle/wpbe74

碩士 === 國立臺灣師範大學 === 化學系 === 97 === Ethanol adsorption and conversion on a series of CeO2- and SiO2- supported catalysts was investigated in order to further understand about ethanol reforming process. These CeO2- and SiO2- supported catalysts were prepared and characterized through N2 physisorption, X-ray diffraction (XRD), temperature programmed reduction (TPR), ethanol pulse chemisorption, temperature programmed desorption (TPD), and ethanol pulse reaction. The result indicated that oxidation pretreatment sample can not only adsorb ethanol, but also shows greater ethanol adsorption than that of reduction pretreatment sample. And the mechanisms of ethanol adsorption for reduced and oxidized surface seems to be different. The ethanol reforming process can be accomplished by bare CeO2. For Pt/CeO2 catalyst, participation of Pt merely accelerates some steps in the process by promoting the decomposition of adsorbed ethanol and making it feasible at lower temperature. For the long time, Pt causes deactivation of catalyst. Both of Pt/SiO2 and Pt/Ce/SiO2 shows unexpected good ethanol conversion capability and deactivation of these catalysts were not observed. Pt/SiO2 reveals considerable ethanol adsorption and conversion capability while both of bare SiO2 and diluted Pt (PtO2 and SiO2 mixed) showed no sign of ethanol adsorption and conversion. That may imply that ethanol adsorption on Pt/SiO2 associates with the interaction between Pt and SiO2.