Journal
JOURNAL OF NATURAL GAS CHEMISTRY
Volume 18, Issue 2, Pages 211-216Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-9953(08)60109-7
Keywords
methanol decomposition; palladium; CeO2-ZrO2-La2O3; XPS; hydrogen; carbon monoxide
Funding
- Natural Science Foundation of China [20773090]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20070610026, 200806100009]
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The catalytic behaviors of Pd (1.4 wt%) catalysts supported on CeO2-ZrO2-La2O3 mixed oxides with different Ce/Zr molar ratios were investigated for methanol decomposition. Nitrogen adsorption-desorption (BET), X-ray photoelectron spectroscopy (XPS), H-2 temperature-programmed reduction (H-2-TPR), X-ray diffraction (XRD) and Pd dispersion analysis were used for their characterization. Pd/Ce0.76Zr0.18La0.06O1.97 catalyst showed the highest BET surface area, best Pd dispersion capability and strongest metal-support interaction. Moreover, XPS showed that there wits lattice defect oxygen or mobile oxygen. According to the result of O 1s measurements the lattice defect oxygen or mobile oxygen helped to maintain Pd in a partly oxidized state and increased the activity for methanol decomposition. The Pd/Ce0.76Zr0.18La0.06O1.97 catalyst exhibited the best activity. A 100% conversion of methanol was achieved at around 260 degrees C, which wits about 20-40 degrees C lower than other catalysts
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