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Received May 17, 2010
Accepted June 12, 2010
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Effects of La2O3 on ZrO2 supported Ni catalysts for autothermal reforming of CH4
Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea
kimsh@korea.ac.kr
Korean Journal of Chemical Engineering, February 2011, 28(2), 402-408(7), 10.1007/s11814-010-0356-7
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Abstract
The effect of La2O3 content in Ni-La-Zr catalyst was investigated for the autothermal reforming (ATR) of CH4. The catalysts were prepared by the coprecipitation method and had a mesoporous structure. Temperature programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS) indicated that a strong interaction developed between Ni species and the support with the addition of La2O3. Thermogravimetric analysis (TGA) and H2-pulse chemisorption showed that the addition of La2O3 led to well dispersed NiO molecules on the support. Ni-La-Zr catalysts gave much higher CH4 conversion than Ni-Zr catalyst. The Ni-La-Zr containing 3.2 wt% La2O3 showed the highest activity. The optimum conditions for maximal CH4 conversion and H2 yield were H2O/CH4=1.00, O2/CH4=0.75. Under these conditions, CH4 conversion of 83% was achieved at 700 ℃. In excess O2 (O2/CH4>0.88), the catalytic activity was decreased due to sintering of the catalyst.
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