کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1276277 1497554 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fundamental understanding of the role of potassium on the activity of Pt/CeO2 for the hydrogen production from ethanol
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Fundamental understanding of the role of potassium on the activity of Pt/CeO2 for the hydrogen production from ethanol
چکیده انگلیسی

The effect of potassium as a promoter on the activity of Pt/CeO2 catalysts for hydrogen production from ethanol was studied in this work. The Pt/CeO2 catalysts with or without potassium were prepared with incipient impregnation method and analyzed using synchrotron-based X-ray diffraction (XRD), X-ray absorption near-edge spectroscopy (XANES), oxygen adsorption, ethanol temperature programmed desorption (TPD) NH3-TPD, and TPR. We find that Pt particles on all CeO2-based catalysts were less than 2 nm. Potassium addition did not have benefit on hydrogen production activity. However, potassium modified active sites, acidity, and interaction between Pt and CeO2. Oxygen storage capacity (OSC) was decreased, while the acidity was neutralized and the interaction between Pt and CeO2 was weakened when potassium was added to Pt/CeO2. Potassium promoted ethanol decomposition reaction while inhibited decarbonylation of acetaldehyde and CH4 formation. This work confirms our previous finding that Pt-CeO2 synergistic interaction played an important role for hydrogen production from bio-alcohols.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 37, Issue 15, August 2012, Pages 11132–11140
نویسندگان
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