Abstract
Co-Ni bi-metallic catalysts supported on Ce-Al2O3 (CA) were prepared with different Co ratios, and the catalytic behaviors were assessed in the n-decane steam reforming reaction with the purpose of obtaining high H2 yield with lower inactivation by carbon deposition. Physicochemical characteristics studies, involving N2 adsorption-desorption, X-ray diffraction (XRD), H2-temperature-programmed reduction (H2-TPR), NH3-temperature-programmed desorption (NH3-TPD), SEM-energy dispersive spectrometer (EDS), and transmission electron microscope (TEM)/HRTEM, were performed to reveal the textural, structural and morphological properties of the catalysts. Activity test indicated that the addition of moderate Co can improve the hydrogen selectivity and anti-coking ability compared with the mono-Ni/Ce-Al2O3 contrast catalyst. In addition, 12% Co showed the best catalytic activity in the series Co-Ni/Ce-Al2O3 catalysts. The results of catalysts characterizations of XRD and N2 adsorption-desorption manifesting the metal-support interactions were significantly enhanced, and there was obvious synergistic effect between Ni and Co. Moreover, the introduction of 12% Co and 6% Ni did not exceed the monolayer saturation capacity of the Ce-Al2O3 support. Finally, 6 h stability test for the optimal catalyst 12%Co-Ni/Ce-Al2O3 demonstrated that the catalyst has good long-term stability to provide high hydrogen selectivity, as well as good resistance to coke deposition.
Highlights
Nowadays, hydrogen is recognized as a clean fuel and energy carrier since its combustion produces only water as product [1,2]
2.1.1. n-Decane Conversion and H2 Selectivity n-decane steam reforming is used as the probe reaction
The initial activity tests over the series catalysts were performed from 650 to 800 ◦ C in order to examine the influence of temperature and differentCatalysts promoters performance. n-decane conversion and H2 selectivity are3 of considered
Summary
Hydrogen is recognized as a clean fuel and energy carrier since its combustion produces only water as product [1,2]. The catalysts used in n-decane steam reforming reaction are to lose activity caused by carbon deposition, especially at higher temperatures [13,14,15]. Hydrocarbons steam reforming reactions have been extensively investigated over noble and transition metals (Pt, Pd, Rh, Ni, Co, etc.) and several oxide supports (Al2 O3 , CeO2 , MgO, ZrO2 , zeolite, etc.) [16,17,18,19,20,21,22,23], so as to develop excellent catalysts to obtain hydrogen as high yield as possible together with high resistance of coke deposition. Various promoters were introduced into Ni-based catalysts to improve catalytic activity and coking resistance. Ni/Ce-Al2 O3 to form Ni-Co bi-metallic catalyst and investigated the catalytic activity, stability and coking inhibition effect during n-decane reforming. This work provided some positive suggestions for catalysts preparation and optimization by studying the structure-activity correlations
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