Studies of potassium-promoted nickel catalysts for methane steam reforming: Effect of surface potassium location

Borowiecki, T.; Denis, A.; Rawski, Michał; Gołębiowski, A.; Stołecki, K.; Dmytrzyk, Jaromir; Kotarba, Andrzej

doi:10.1016/j.apsusc.2014.02.053

Cited by 51 publications

(30 citation statements)

References 36 publications

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“…60 g of (NH 4 ) 2 Ce(NO 3 ) 6 and 200 g of urea were dissolved into 2000 mL of water and the mixture was heated gradually to 90°C under stirring and kept at this temperature for 27 h. After filtration and thorough washing with water, the precipitate was dried at 100°C overnight, and finally calcined at 400°C for 5 h in air. Ir/CeO 2 catalyst was prepared by a deposition-precipitation method.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…Hydrogen, when produced from renewable biomass sources, has been regarded as an ideal energy carrier for the sustainable energy development [1][2][3][4][5][6][7][8]. Among the various biomass-derived feedstocks, bio-ethanol is considered as one of the most promising alternatives because of its relatively high hydrogen content, availability and non-toxicity [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen production from ethanol over Ir/CeO2 catalyst: Effect of the calcination temperature

Zou

Zhang

et al. 2015

Fuel

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Section: Catalyst Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogen production from ethanol over Ir/CeO2 catalyst: Effect of the calcination temperature

Zou

Zhang

et al. 2015

Fuel

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“…Lanthanide metals (La, Ce), alkali metals (Na, K), and alkali earth metals (Mg, Ca, Sr, Ba) promoters [28][29][30][31][32][33], have been found to be effective for improving coking-resistant capacity. However, the addition of these additives influenced Ni dispersion, due to a part of the promoter is in an intimate contact with nickel [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Performance and Characterization of Ni-Co Bi-Metallic Catalysts in n-Decane Steam Reforming: Effects of Co Addition

Yu¹,

Jiao

Wang³

et al. 2018

Catalysts

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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 reduction (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.

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“…However, carbon cokes generated over these catalytic surfaces result in catalyst deterioration, due to their strong interaction with carbon oxides evolved as intermediates. To prevent this problem, alkali metal promoters, such as Ca, Mg, Sr, and K, and supports, such as Al 2 O 3 , zeolite, and SiO 2 , have been used. Alkali metals are relatively effective at increasing catalyst durability and suppressing carbon deposition but have a negative impact on the fuel conversion ability of the catalyst due to their relatively strong basicity .…”

Section: Introductionmentioning

confidence: 99%

Effective hydrogen productions from propane steam reforming over spinel-structured metal-manganese oxide redox couple catalysts

et al. 2017

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Summary In this study, redox couple metal components (M═Mn) were introduced in a catalyst design. Main catalytic components (M═Fe, Co, Ni, or Cu) were combined with Mn, resulting in spinel‐structured M2MnO4 for applications to the propane steam reforming reaction as catalysts. Hydrogen selectivity and propane conversions over spinel‐structured 30.0 wt% M2MnO4 loaded on 70.0 wt% γ‐Al2O3 support were comparable. The Ni2MnO4/Al2O3 exhibited extremely stable catalytic performance for 3 recycling tests. Catalytic activities decreased in the order Ni2MnO4/Al2O3 > Co2MnO4/Al2O3 > Fe2MnO4/Al2O3 > Cu2MnO4/Al2O3 > Mn2O3/Al2O3. A mechanism for propane steam reforming over M2MnO4 was suggested, and it was found that the catalytic performance for the reforming reaction was closely related to the stability of metal oxidation states via Mn oxide assistance. Furthermore, this study suggested that the Mn oxide delivered oxygen to the main catalytic active site, in particular the Ni component, leading to the rapid cracking and oxidation of C3H8, C2H4, and CH4, and increased hydrogen production.

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Studies of potassium-promoted nickel catalysts for methane steam reforming: Effect of surface potassium location

Cited by 51 publications

References 36 publications

Hydrogen production from ethanol over Ir/CeO2 catalyst: Effect of the calcination temperature

Hydrogen production from ethanol over Ir/CeO2 catalyst: Effect of the calcination temperature

Catalytic Performance and Characterization of Ni-Co Bi-Metallic Catalysts in n-Decane Steam Reforming: Effects of Co Addition

Effective hydrogen productions from propane steam reforming over spinel-structured metal-manganese oxide redox couple catalysts

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