A comparison between copper and nickel-based catalysts obtained from hydrotalcite-like precursors for WGSR

Fuentes, Edgardo Meza; Faro, Arnaldo C.; Silva, Tatiana de Freitas; Assaf, José Mansur; Rangel, María do Carmo

doi:10.1016/j.cattod.2011.03.082

Cited by 44 publications

(17 citation statements)

References 45 publications

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“…The catalyst calcined at 500 °C showed two peaks at low temperatures (324 and 422 °C), which can be assigned to the reduction of bigger particles of nickel oxide in weak interaction with the support, in accordance with previous work [39]. The lowest-temperature peak can also be associated to the reduction of copper species interacting with alumina [46,47]. These peaks were less intense for the catalyst calcined at 600 o C and disappeared in the case of the sample calcined at 800 o C, indicating an increase of interaction of the metals with the support, rendering the segregation of nickel oxide.…”

Section: Catalysts Evaluationsupporting

confidence: 71%

“…However, the carbon dioxide conversions were always higher than the methane conversions, indicating to the occurrence of reverse water gas shift reaction (WGSR), which also consumes carbon dioxide (Equation 2) [49], as found previously [24]. As pointed out early [46], both copper and nickel are active in WGSR (Equação 2).…”

Section: Figurementioning

confidence: 63%

“…These peaks were less intense for the catalyst calcined at 600 o C and disappeared in the case of the sample calcined at 800 o C, indicating an increase of interaction of the metals with the support, rendering the segregation of nickel oxide. A broad peak at high temperatures, centered at 665 °C, was also noted for the solid calcined at 500 o C, indicating the reduction of nickel species in different interactions with the support [46]. According to several works [26,39,45,48], various processes may occur at this temperature range such as the reduction of small nickel oxide particles in strong interaction with the support, nickel oxide containing aluminum species in the lattice or nickel aluminate.…”

Section: Catalysts Evaluationmentioning

confidence: 99%

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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: Catalysts Evaluationsupporting

confidence: 71%

Section: Figurementioning

confidence: 63%

Section: Catalysts Evaluationmentioning

confidence: 99%

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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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“…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%

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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“…. ) or zeolites [1][2][3][4][5][6][7][8]; and the metal-oxide catalysts [9][10][11][12][13][14][15][16][17][18]. Regarding the first class of catalytic materials, the deposition method of the active species, principally in case of noble metals, allows highly dispersed nanoparticles (NPs) to be obtained [19,20] resulting in an important number of active sites available for catalytic reactions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

et al. 2017

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Abstract:Since the early discovery of the catalytic activity of gold at low temperature, there has been a growing interest in Au and Au-based catalysis for a new class of applications. The complexity of the catalysts currently used ranges from single crystal to 3D structured materials. To improve the efficiency of such catalysts, a better understanding of the catalytic process is required, from both the kinetic and material viewpoints. The understanding of such processes can be achieved using environmental imaging techniques allowing the observation of catalytic processes under reaction conditions, so as to study the systems in conditions as close as possible to industrial conditions. This review focuses on the description of catalytic processes occurring on Au-based catalysts with selected in situ imaging techniques, i.e., PEEM/LEEM, FIM/FEM and E-TEM, allowing a wide range of pressure and material complexity to be covered. These techniques, among others, are applied to unravel the presence of spatiotemporal behaviours, study mass transport and phase separation, determine activation energies of elementary steps, observe the morphological changes of supported nanoparticles, and finally correlate the surface composition with the catalytic reactivity.

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A comparison between copper and nickel-based catalysts obtained from hydrotalcite-like precursors for WGSR

Cited by 44 publications

References 45 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

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

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

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