TY - JOUR

T1 - Hydrogen production from ethanol steam reforming over nickel based catalyst derived from Ni/Mg/Al hydrotalcite-like compounds

AU - Li, M.

AU - Wang, Xiaodong

AU - Li, S.

AU - Wang, S.

AU - Ma, X.

PY - 2010

Y1 - 2010

N2 - Nickel based catalysts derived from thermal decomposition of Ni/Mg/Al hydrotalcite-like precursors have been studied in ethanol steam reforming (ESR) for hydrogen production. X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature-programmed reduction (TPR) and thermogravimetric analysis (TGA) were used to investigate the physic-chemical properties of the catalysts prepared. The catalysts being mainly composed of Ni–Mg–O solid solution phase exhibited high activity and stability for ethanol steam reforming. Ethanol could be completely converted even at 673 K, and hydrogen concentration tended to increase with increasing reaction temperature, gas hourly space velocity (GHSV) and Ni/Mg ratio. XRD and TEM investigations demonstrate that low Ni/Mg ratio led to insufficient Ni0 phase available, which may result in decreasing activity and stability due to coke formation observed on the NiMg10 (Ni/Mg = 1/10) catalyst. High reduction pretreatment temperature (>973 K) could promote the reduction of Ni0 metal, and effectively improve the catalytic activity and stability. The optimum reduction temperature might be 1073 K, at which proper amount of Ni0 species and good resistance to coke formation could be obtained.

AB - Nickel based catalysts derived from thermal decomposition of Ni/Mg/Al hydrotalcite-like precursors have been studied in ethanol steam reforming (ESR) for hydrogen production. X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature-programmed reduction (TPR) and thermogravimetric analysis (TGA) were used to investigate the physic-chemical properties of the catalysts prepared. The catalysts being mainly composed of Ni–Mg–O solid solution phase exhibited high activity and stability for ethanol steam reforming. Ethanol could be completely converted even at 673 K, and hydrogen concentration tended to increase with increasing reaction temperature, gas hourly space velocity (GHSV) and Ni/Mg ratio. XRD and TEM investigations demonstrate that low Ni/Mg ratio led to insufficient Ni0 phase available, which may result in decreasing activity and stability due to coke formation observed on the NiMg10 (Ni/Mg = 1/10) catalyst. High reduction pretreatment temperature (>973 K) could promote the reduction of Ni0 metal, and effectively improve the catalytic activity and stability. The optimum reduction temperature might be 1073 K, at which proper amount of Ni0 species and good resistance to coke formation could be obtained.

U2 - 10.1016/j.ijhydene.2010.04.105

DO - 10.1016/j.ijhydene.2010.04.105

M3 - Journal article

VL - 35

SP - 6699

EP - 6708

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 13

ER -