Ni catalysts supported over MgAl2O4 modified with Pr for hydrogen production from ethanol steam reforming

Barroso, Mariana N.; Galetti, Agustín E.; Abello, M. Cristina

doi:10.1016/j.apcata.2010.12.038

Cited by 59 publications

(39 citation statements)

References 46 publications

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“…In all the cases, the decomposition temperature increases with temperature of mineralization, suggesting the presence of more stable carbonaceous species at higher temperature, according to literature reports [25][26][27] . The free-nickel samples C500 and C600, Figure 1a, show a slight gain of weight around 320 and 378 °C, respectively, which it is not observed in C700.…”

Section: Resultssupporting

confidence: 61%

Synthesis of Nickel Nanoparticles Supported on Carbon Using a Filter Paper as Biomorphic Pattern for Application in Catalysis

et al. 2015

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Section: Resultssupporting

confidence: 61%

Synthesis of Nickel Nanoparticles Supported on Carbon Using a Filter Paper as Biomorphic Pattern for Application in Catalysis

et al. 2015

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“…On the other hand, the properties of PrO2 such as oxygen storage capacity, oxygen vacancies and redox (owing to the oxidation states Pr 3+ /Pr 4+ ) are well known and documented (Liu et al, 2011). Pr has been used as a promoter of Ni based catalysts for various reforming reactions, as described by Gallego et al 2009) for perovskite (Ni/La/O) derived catalysts; by Gamba et al (2011) for Ni catalysts supported on smectite, and by Barroso et al (2011) for Ni catalysts supported on MgAl2O4. It is assumed that the promoter properties of Pr are based on the generation of superficial oxygen vacancies, which favor the neighborhood of the metallic phase in the supported catalyst and assist the removal of coke deposits.…”

Section: Introductionmentioning

confidence: 99%

OXIDATIVE-REFORMING OF METHANE AND PARTIAL OXIDATION OF METHANE REACTIONS OVER NiO/PrO2/ZrO2 CATALYSTS: EFFECT OF NICKEL CONTENT

Asencios

Marcos

Assaf

et al. 2016

Braz. J. Chem. Eng.

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-In this work the behavior of NiO-PrO2-ZrO2 catalysts containing various nickel loadings was evaluated in the partial oxidation of methane and oxidative-reforming reactions of methane. The catalysts were characterized by X-Ray Diffraction Analysis (in situ-XRD), Temperature Programmed Reduction (H2-TPR), Scanning Electron Microscopy (SEM/EDX) and Adsorption-Desorption of nitrogen (BET area). The reactions were carried out at 750 °C and 1 atm for 5 hours. The catalysts were studied with different nickel content: 0, 5, 10 and 15% (related to total weight of catalyst, wt%). In both reactions, the catalyst containing the mixture of the three oxides (NiO/PrO2/ZrO2) with 15% nickel (15NiPrZr catalyst) showed the best activity for the conversion of the reactants into Syngas and showed high selectivity for H2 and CO. The results suggest that the promoter PrO2 and the Niº centers are in a good proportion in the catalyst with 15% Ni. Our results showed that low nickel concentrations in the catalyst led to high metallic dispersion; however, very low nickel concentrations did not favor the methane transformation into Syngas. The catalyst containing only NiO/ZrO2 in the mixture was not sufficient for the catalysis. The presence of the promoter PrO2 was very important for the catalysis of the POM.

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“…MgAl 2 O 4 support was prepared by the citrate method [26]. The sample was calcined in two steps: (1) under a N 2 flow (180 mL min −1 ) from room temperature to 500 °C at 5° min −1 and 2 h at 500 °C; cooling down in N 2 flow and then, (2) in static air from room temperature to 700 °C at 5° min −1 and 1 h at 700 °C.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…affect the mechanism of carbon deposition [3]. The addition of alkaline metals, alkaline earth metals or rare earth metals has been frequently used on Ni catalysts to increase the carbon tolerance [23,26,27]. It has been reported that the addition of Na or K changes the surface acidity of catalyst and minimizes the ethylene formation known as coke precursor.…”

Section: Introductionmentioning

confidence: 99%

Ni-supported catalysts for ethanol steam reforming: effect of the solvent and metallic precursor in catalyst preparation

et al. 2018

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Ethanol steam reforming was studied over Ni/MgAl 2 O 4 -CeO 2 catalysts. The catalysts were prepared using different impregnation media (ethanol or water) and Ni precursors (nitrate or acetate). The use of an alcoholic solution did not affect the specific surface area, but promoted the NiO formation reducible at lower temperature affecting the Ni-support interactions and the Ce 3+ /Ce 4+ initial ratios. All catalysts were highly active in the reforming reaction of ethanol with a high initial conversion of ethanol under more severe conditions than those commonly used in literature. The best catalytic behavior was found over the catalyst prepared from an ethanolic solution of Ni(NO 3 ) 2 . This sample showed a high Ce 3+ /Ce 4+ ratio, an adequate interaction Ni-support and an average Ni diameter around 28 nm. This catalyst was stable under the reforming conditions used in this work: initial ethanol concentration: 9.4%, reaction temperature: 650 °C, W/F = 49 g min mol −1 C 2 H 5 OH and reaction time: 40 h. The ethanol conversion was almost complete with H 2 selectivity around 78%.

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Ni catalysts supported over MgAl2O4 modified with Pr for hydrogen production from ethanol steam reforming

Cited by 59 publications

References 46 publications

Synthesis of Nickel Nanoparticles Supported on Carbon Using a Filter Paper as Biomorphic Pattern for Application in Catalysis

Synthesis of Nickel Nanoparticles Supported on Carbon Using a Filter Paper as Biomorphic Pattern for Application in Catalysis

OXIDATIVE-REFORMING OF METHANE AND PARTIAL OXIDATION OF METHANE REACTIONS OVER NiO/PrO2/ZrO2 CATALYSTS: EFFECT OF NICKEL CONTENT

Ni-supported catalysts for ethanol steam reforming: effect of the solvent and metallic precursor in catalyst preparation

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