Citation: DANG Cheng-Xiong, YANG Hao-Bo, YU Hao, WANG Hong-Juan, PENG Feng. CexNi0.5La0.5-xO Catalysts for Hydrogen Production by Oxidative Steam Reforming of Glycerol: Influence of the Ce-to-La Ratio[J]. Acta Physico-Chimica Sinica, ;2016, 32(6): 1527-1533. doi: 10.3866/PKU.WHXB201603161
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CexNi0.5La0.5-xO (CeNiLaO) catalysts were synthesized using a Ce-La composite oxide as the carrier via co-precipitation. They were applied in the oxidative steamreforming of glycerol (OSRG) in a fixed-bed reactor. The catalysts were characterized by X-ray diffraction (XRD), H2-temperature-programmed reduction (H2-TPR), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Xray photoelectron spectroscopy (XPS). The results showed that La2O3 improved the dispersion of metallic Ni and suppressed the sintering of metallic Ni particles; the lattice oxygen of CeO2 inhibited and eliminated carbon deposition on the surface of the catalysts; and the substitution of some La3+ for Ce4+ ions induced a distortion of the lattice. The synergy of La2O3 and CeO2 lessened the deactivation caused by the sintering and coke deposition and improved the catalytic performance. Among the catalysts with different molar ratios of Ce to La, Ce0.4Ni0.5La0.1O had the best catalytic activity. The conversion of glycerol remained above 95% after a 210 h stability test, while a gaseous reformate of about 50% hydrogen could be steadily produced.
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Keywords:
- CeO2,
- La2O3,
- Ni,
- Stability,
- Glycerol,
- Hydrogen production,
- Steam reforming
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