The effect of metal content on nickel-based catalysts obtained from hydrotalcites for WGSR in one step

Fuentes, Edgardo Meza; Aires, F.J. Cadete Santos; Prakash, S.; Faro, Arnaldo C.; Silva, Tatiana de Freitas; Assaf, José Mansur; Rangel, María do Carmo

doi:10.1016/j.ijhydene.2013.10.114

Cited by 27 publications

(29 citation statements)

References 55 publications

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“…As found by TPR, the reduction profile of this sample is typical of nickel aluminate [39,49]. These catalysts produced the highest amount of water, indicating that they are the most active in the reverse WGSR, probably due to nickel atoms [54]. The hydrogen to carbon monoxide molar ratios were lower than 1.0 for all catalysts, as shown in Table 3.…”

Section: Figuresupporting

confidence: 55%

Evaluation of nickel and copper catalysts in biogas reforming for hydrogen production in SOFC

Silva

Martins

Ballarini³

et al. 2017

Matéria (Rio J.)

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The solid oxide fuel cells (SOFC) enable the efficient generation of clean energy, fitting the current requirements of the growing demand for electricity and for the environment preservation. When powered with biogas (from digesters of municipal wastes), the SOFCs also contribute to reduce the environmental impact of these wastes. The most suitable route to produce hydrogen inside SOFC from biogas is through dry reforming but the catalyst is easily deactivated by coke, because of the high amounts of carbon in the stream. A promising way to overcome this drawback is by adding a second metal to nickel-based catalysts. Aiming to obtain active, selective and stable catalysts for biogas dry reforming, solids based on nickel (15%) and copper (5%) supported on aluminum and magnesium oxide were studied in this work. Samples were prepared by impregnating the support with nickel and copper nitrate, followed by calcination at 500, 600 and 800 o C. It was noted that all solids were made of nickel oxide, nickel aluminate and magnesium aluminate but no copper compound was found. The specific surface areas did not changed with calcination temperature but the nickel oxide average particles size increased. The solids reducibility decreased with increasing temperature. All catalysts were active in methane dry reforming, leading to similar conversions but different selectivities to hydrogen and different activities in water gas shift reaction (WGSR). This behavior was assigned to different interactions between nickel and copper, at different calcination temperatures. All catalysts were active in WGSR, decreasing the hydrogen to carbon monoxide molar ratio and producing water. The catalyst calcined at 500 o C was the most promising one, leading to the highest hydrogen yield, besides the advantage of being produced at the lowest calcination temperature, requiring less energy in its preparation.

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Section: Figuresupporting

confidence: 55%

Evaluation of nickel and copper catalysts in biogas reforming for hydrogen production in SOFC

Silva

Martins

Ballarini³

et al. 2017

Matéria (Rio J.)

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“…For instance, E. M. Fuentes et al. reported that the Al 2 O 3 together with ZnO helped in dispersing Ni species within NiO‐ZnO‐Al 2 O 3 mixed oxides prepared via hydrotalcite‐like precursors . Additionally, well dispersed Ni, Ni−Cu alloys and Ni−Fe alloys over Al 2 O 3 show enhanced WGS activity than poorly dispersed catalysts ,.…”

Section: Wgs Over Ni‐based Catalystsmentioning

confidence: 99%

“…Similarly, the NiMnO 3 phase with ilmenite‐like structure in Ni supported Mn−CeO 2 has been reported to prevent the formation of bulk‐like Ni particles and improves the oxygen mobility and the redox activity of the catalysts ,. In other work, addition of Zn to Ni−Al 2 O 3 hydrotalcites led to an increase in Ni reducibility and enhancement in WGS activity with reduced methane formation . However, the role of Zn doping has not been elucidated clearly.…”

Section: Modifications To Ni‐based Catalysts For Methane Suppressionmentioning

confidence: 99%

Nickel‐based Catalysts for High‐temperature Water Gas Shift Reaction‐Methane Suppression

2018

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This article provides a critical review of Ni-based catalysts employed in high temperature and ultra-high temperature water gas shift reaction (WGS) for hydrogen production and methane suppression. The promotional role of nature and type of active metal and support for WGS reaction is discussed with respect to activity and selectivity. This review mainly covers the recent strategic catalytic formulations like promotion with alkali metals, alloying with another metal and core@-shell-like structures for suppressing methanation during WGS reaction. The change in nature and strength of CO adsorption over modified Ni-surfaces is discussed using available in situ CO-DRIFTS results. The various WGS reaction and CO methanation pathways are also presented together with insights gained from computational DFT studies.[a] Dr.

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“…In recent years the development of nanotechnology has contributed to important advances in areas such as catalysis, electrochemistry, design of solar cells and mobile devices, etc. In this context, nickel oxide (NiO) in the form of nanoparticles or nano-films has properties that allow its use in heterogeneous catalysis, photocatalysis, manufacture of its use in heterogeneous catalysis requires a previous dispersion in supports based on activated carbon, zeolites, silica and especially alumina, which gives the final solids greater surface area, thermal and mechanical resistance, also allowing for the obtainment of small particles of NiO on the support and greater catalytic activity [1,2,[14][15][16][17]. The chemical properties of metallic nickel particles obtained by reduction reactions of NiO deposited on the surface of alumina, depends on the degree of interaction of this oxide with the support, which influences the crystallinity and the size of the particles supported.…”

Section: Introductionmentioning

confidence: 99%

“…The chemical properties of metallic nickel particles obtained by reduction reactions of NiO deposited on the surface of alumina, depends on the degree of interaction of this oxide with the support, which influences the crystallinity and the size of the particles supported. In order to obtain nanoparticles of nickel oxide, several investigations have been carried out in which the synthesis methods have been varied, highlighting the sol-gel and co-precipitation methods, spray pyrolysis, hydrothermal methods, etc., which aim to obtain a good dispersion of NiO on the supports [1,7,9,[12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of NiO present in solids obtained from hydrotalcites based on Ni/Al and Ni-Zn/Al

Fuentes

Ruiz

Santos

2019

DYNA

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NiO has a variety of applications, mainly in the production of electrochemical sensors and of metallic nickel. In addition, it is widely used as catalysts to produce hydrogen from natural gas. In this work, hydrotalcites based on nickel-aluminum and nickel-zinc-aluminum were synthesized, calcined at 500 °C and studied by different techniques. It was observed that nickel-aluminum hydrotalcites are thermally more stable, collapsing at higher temperatures than hydrotalcites containing zinc. During calcination, aluminum is incorporated into NiO lattice, leading to a decrease in crystallographic parameters. However, zinc decreases this effect, favoring the formation of NiO with lattice parameters close to pure nickel oxide. Zinc also contributes to the formation of smaller NiO particles, which is very useful for its use as a catalyst. In addition, aluminum led to a distortion in NiO lattice, an effect that is minimized by zinc, showing that it hinders the incorporation of Al3+ in the NiO lattice.

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The effect of metal content on nickel-based catalysts obtained from hydrotalcites for WGSR in one step

Cited by 27 publications

References 55 publications

Evaluation of nickel and copper catalysts in biogas reforming for hydrogen production in SOFC

Evaluation of nickel and copper catalysts in biogas reforming for hydrogen production in SOFC

Nickel‐based Catalysts for High‐temperature Water Gas Shift Reaction‐Methane Suppression

Characteristics of NiO present in solids obtained from hydrotalcites based on Ni/Al and Ni-Zn/Al

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