標題: | Autothermal steam reforming of ethanol over La2Ce2-xRuxO7 (x=0-0.35) catalyst for hydrogen production |
作者: | Weng, Sheng-Feng Wang, Yun-Hsin Lee, Chi-Shen 應用化學系 Department of Applied Chemistry |
關鍵字: | Autothermal steam reforming of ethanol;Pyrochlore;Solid solution;Ruthenium |
公開日期: | 2-五月-2013 |
摘要: | Pyrochlore phases solid solutions, La2Ce2-xRuxO7 (x=0-0.35) were prepared with a sol-gel process and used as catalysts for the autothermal steam reforming of ethanol. The samples as prepared were characterized with powder X-ray diffraction (PXRD), X-ray photoelectron spectra (XPS), and temperature-programmed reduction (TPR). The XPS and TPR spectra revealed the effect of doped Run+ to oxidation states of La and Ce sites. The low temperature reduction ability and relative concentration of Ce4+ ions are increased as the cell-dimension decreased. Tests of catalytic activity showed that the reforming performance of La2Ce2-xRuxO7 catalysts was affected by the Ru/Ce loading ratio. For all catalysts, partial oxidation was favored at a large C/O composition; incomplete ethanol conversion was observed for C/O >= 0.7. The optimized catalyst was La2Ce1.8Ru0.2O7 with hydrogen production rate (r(H2)) 2.01 x 10(-3) mol s(-1) g(cat)(-1) (autothermal temperature similar to 600 degrees C and 97% ethanol conversion at C/O=0.6). The catalyst exhibited stable r(H2) over 26 h of the reaction with ethanol conversion >95%. r(H2) of the catalyst gradually decreased thereafter because LaAlO3 started to formed and affected catalytic process. For the catalyst, the Ru ions remained well dispersed before and after the AESR reaction. (C) 2013 Elsevier B.V. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.apcatb.2013.01.025 http://hdl.handle.net/11536/21644 |
ISSN: | 0926-3373 |
DOI: | 10.1016/j.apcatb.2013.01.025 |
期刊: | APPLIED CATALYSIS B-ENVIRONMENTAL |
Volume: | 134 |
Issue: | |
起始頁: | 359 |
結束頁: | 366 |
顯示於類別: | 期刊論文 |