Effects of La2O3 on ZrO2 supported Ni catalysts for autothermal reforming of CH4

Sun Hee Park; Byung-Hee Chun; Sung Hyun Kim

Korean Journal of Chemical Engineering, Vol.28, No.2, 402-408, February, 2011

DOI10.1007/s11814-010-0356-7 Export Citation

Effects of La2O3 on ZrO2 supported Ni catalysts for autothermal reforming of CH4

Sun Hee Park, Byung-Hee Chun, and Sung Hyun Kim^†

Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea

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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.

Keywords:Methane;Reforming;Autothermal;Lanthanum;Zirconium Oxide;Nickel Catalyst

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[3] Escritori JC, Dantas SC, Soares RR, Hori CE, Catal. Commun., 10, 1090 (2009)

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[11] Martinez R, Romero E, Guimon C, Bilbao R, Appl. Catal. A: Gen., 274(1-2), 139 (2004)

[12] Roh HS, Jun KW, Dong WS, Chang JS, Park SE, Joe YI, J. Mol. Catal. A: Chem., 18, 137 (2002)

[13] Koo KY, Roh HS, Seo YT, Seo DJ, Yoon WL, Park SB, Int. J. Hydrogen Energy., 33, 2036 (2008)

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[17] Park KT, Jung UH, Choi DW, Chun K, Lee HM, Kim SH, J. Power Sources, 177(2), 247 (2008)

[18] Wei JM, Xu BQ, Li JL, Cheng ZX, Zhu QM, J. Mol.Catal. A: Chem., 196, 167 (2000)

[19] Rouquerol J, Pure Appl. Chem., 66, 1739 (1994)

[20] Sing KSW, Pure Appl. Chem., 57, 603 (1985)

[21] Brunauer S, Emmett PH, Teller E, J. Am. Chem. Soc., 60, 309 (1938)

[22] Slagtern A, Schuurman Y, Leclercq C, Verykios X, J. Catal., 172(1), 118 (1997)

[23] Gadalla AM, Bower B, Chem. Eng. Sci., 43, 3049 (1988)

[24] Tsang SC, Claridge JB, Green ML, Catal. Today, 23(1), 3 (1995)

[25] Sainchez-Sainchez MC, Int. J. Hydrogen Energy., 32, 1462 (2007)

[26] Hickman DA, Science., 259, 343 (1993)

[27] Trimm DL, Catal. Today, 49(1-3), 3 (1999)