Influence of method of preparation on the activity of La–Ni–Ce mixed oxide catalysts for dry reforming of methane

In this paper, the methanation of carbon oxides (CO and CO 2 ) was studied as an interesting way to provide a renewable energy source of synthetic natural gas (SNG) simultaneously reducing the emission of greenhouse gases. 15 wt.% Ni-based catalysts supported on CeO 2 , Al 2 O 3 and Y 2 O 3 oxides were synthesized by solution combustion synthesis. Then, a second series on Ni/Y 2 O 3 catalysts was prepared with different Ni loading (7-35 wt.%). The physicochemical properties of the catalysts were characterized by N 2 -physisorption, XRD, H 2 -TPR, CO-chemisorption, TEM, UV-Vis DRS, XPS, and CO 2 -TPD. The effect of reaction temperature (250-500°C) was investigated under atmospheric pressure, space velocity (GHSV) of 10,000 h −1 , and stoichiometric reactants ratio of (H 2 -CO 2 )/(CO+CO 2 ) = 3. A 200 h stability test was also carried out at 350°C over the 25 wt.% Ni/Y 2 O 3 catalyst. It can be concluded that the nature of Ni-support interactions played a crucial role in enhancing CO and CO 2 hydrogenation at relatively low reaction temperature. Ni/CeO 2 catalyst deactivated rapidly due to coke deposition, while the formation of NiAl 2 O 4 spinel was the main reason of the lower activity of the Al 2 O 3 -supported system. Activity data for Ni/Y 2 O 3 catalysts were closely related to the degree of Ni dispersion as well as to the medium-strength basicity. Good anti-coking and anti-sintering ability were observed after 200 h of lifetime test over the 25Ni/Y 2 O 3 catalyst.

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“…The low-temperature peak at ca. 270°C was ascribed to the reduction of adsorbed oxygen on the Ni-Ce mixed oxide [64]. The peak at ca.…”

Section: H 2 -Tpr and Co-chemisorptionmentioning

confidence: 99%

CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides

Italiano

Llorca

Pino

et al. 2020

Applied Catalysis B: Environmental

225

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“…Although also CeO2 species can be reduced, most hydrogen consumption is expected to be due to the reduction of NiO species [42]. The features of the NiO/CeO2 TPR profile can be described in the light of the literature on NiO-CeO2 systems [19,42,[57][58][59]. The low-temperature feature can be ascribed to the loss of oxygen species adsorbed on defective sites at the NiO-CeO2 interface, where Ce and Ni are in close interaction.…”

Section: Reducibility Of Nio-ceo2-zro2 Mixed Oxides and Characterizatmentioning

confidence: 99%

CO and CO2 Co-Methanation on Ni/CeO2-ZrO2 Soft-Templated Catalysts

et al. 2019

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Supported nickel catalysts were synthesized, characterized, and employed in the carbon oxides co-methanation process. Five NiO/CeO2-ZrO2 mixed oxides, with the same Ni content and different Ce/Zr molar ratios, were prepared by the soft-template method. They were characterized through ICP-AES, N2 adsorption, XRD, and TPR. Reduced Ni/CeO2-ZrO2 catalysts were obtained by submitting the oxide systems to reduction treatment in H2 at 400 °C. They were characterized by XRD, H2-TPD, and CO2 adsorption microcalorimetry and their catalytic performances in the carbon oxides co-methanation were investigated. Catalytic tests were performed in a fixed-bed continuous-flow microreactor at atmospheric pressure. The effect of experimental conditions (reaction temperature, space velocity, reactants molar ratio) was also studied. Almost complete CO conversion was obtained on any catalyst, whereas CO2 conversion was much lower and increased with Ce content, at least up to Ce/Zr = 1. The beneficial effect of the Ce content could be related to the increased NiO reducibility and to the higher ability to adsorb and activate CO2. However, at high Ce/Zr ratios, it is probably counterbalanced by an interplay of reactions involving CO and CO2.

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“…Two series of LaNi x Al 1−x O 3 perovskite catalysts with 0 ≤ x ≤ 1 were prepared by the hydrothermal and sol-gel methods. 20,21 Required amounts of La…”

Section: Catalyst Preparationmentioning

confidence: 99%

Syngas production by $$\hbox {CO}_{2}$$ CO 2 reforming of methane on $$\hbox {LaNi}_{\mathrm{x}}\hbox {Al}_{1-\mathrm{x}}\hbox {O}_{3}$$ LaNi x Al 1 - x O 3 perovskite catalysts: influence of method of preparation

et al. 2017

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Two series of LaNi x Al 1−x O 3 catalysts (0 ≤ x ≤ 1) were prepared by hydrothermal and sol-gel methods and characterized by X-ray diffraction (XRD), BET surface area, Temperature programmed reduction (TPR) and Fourier-transform infrared spectroscopy (FT-IR) techniques. The performance of these catalysts was studied for CO 2 reforming of methane (also called dry reforming of methane, DRM) at atmospheric pressure and in the temperature range of 600−800 • C, maintaining a space velocity of 28,800 h −1. Catalysts containing trimetallic perovskite showed higher CH 4 and CO 2 conversions than the bimetallic perovskite, due to the strong interaction of Ni with the former. Strong interaction increased the reduction temperature of the active species and reduced the sintering of metallic particles. At 800 • C, the sol-gel catalysts reached their maximum activity in terms of both CH 4 and CO 2 conversions at x = 0.3, whereas the same for hydrothermal catalysts required a Ni ratio x = 0.6. The trimetallic perovskite formation was responsible for the catalyst stability. A comparison of the best catalysts from the two series revealed that the hydrothermal catalysts exhibited a slightly better performance during the time on stream analysis. The results are interpreted in terms of changes in the physicochemical properties of the catalysts.

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Influence of method of preparation on the activity of La–Ni–Ce mixed oxide catalysts for dry reforming of methane

Cited by 50 publications

References 29 publications

CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides

CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides

CO and CO2 Co-Methanation on Ni/CeO2-ZrO2 Soft-Templated Catalysts

Syngas production by $$\hbox {CO}_{2}$$ CO 2 reforming of methane on $$\hbox {LaNi}_{\mathrm{x}}\hbox {Al}_{1-\mathrm{x}}\hbox {O}_{3}$$ LaNi x Al 1 - x O 3 perovskite catalysts: influence of method of preparation

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