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Impact of heating rate and solvent on Ni-based catalysts prepared by solution combustion method for syngas methanation

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Zeng Y., Ma H., Zhang H., Ying W., Fang D.
Polish Journal of Chemical Technology
|
2014
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vol. 16
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issue 4
95-100
EN
Ni-Al2O3 catalysts prepared by solution combustion method for syngas methanation were enhanced by employing various heating rate and different solvent. The catalytic properties were tested in syngas methanation. The result indicates that both of heating rate and solvent remarkably affect Ni particle size, which is a key factor to the catalytic activity of Ni-Al2O3 catalysts for syngas methanation. Moreover, the relationship between Ni particle size and the production rate of methane per unit mass was correlated. The optimal Ni-Al2O3 catalyst prepared in ethanol at 2°C/min, achieves a maximum production rate of methane at the mean size of 20.8 nm.
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Alumina modified by niobia supported nickel catalysts for hydrodechlorination of 1,2-dichloroethane

100%
Śrębowata A.
Recyclable Catalysis
|
2015
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vol. 2
|
issue 1
EN
Nb2O5/Al2O3 materials prepared by sol-gel method using aluminium hydroxychloride and potassium niobate solutions were used as supports for nickel catalyst. 2 wt. % Ni catalysts were investigated by temperatureprogrammed reduction, TEM, X-ray diffraction, hydrogen chemisorption and high-resolution transmission electron microscopy (HRTEM). Hydrodechlorination (HDC) of 1,2-dichloroethane (1,2-DCA) over alumina modified by niobia supported nickel catalysts led to formation of ethylene as desired product. Selectivity toward C2H4 increases from ~35% for 2%Ni/Al2O3 up to 90% for Ni/Nb2O5- Al2O3. This phenomenon is an effect of the coexistence of Nb2O5 and Al2O3. Niobia is preferentially located over alumina, shaping the overall catalytic behavior of Nb2O5 – Al2O3 supported catalysts. This phenomenon could be related with the changes between Brönsted and Lewis acidic active sites ratio. Temperature programmed hydrogenation (TPH) of post-reaction deposits showed that during HDC on catalysts surface both carbon and chlorine-containing species were formed. Application of regeneration procedure (3h, 10%H2/Ar, 600°C) for spent samples led to efficient reconstruction of active sites.
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