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^*

来源：Applied Catalysis B: Environmental , 2013, 134: 359-366.

DOI：10.1016/j.apcatb.2013.01.025

• Autothermal steam reforming of ethanol
• Pyrochlore
• Solid solution
• Ruthenium

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 %26gt;= 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 %26gt;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.

• 出版日期2013-5-2