Pure and Ni-substituted Co3O4 spinel catalysts for direct N2O decomposition

Abu-Zied, Bahaa M.; Soliman, Soliman A.; Abdellah, S.E.

doi:10.1016/s1872-2067(14)60058-9

Cited by 58 publications

(33 citation statements)

References 40 publications

(57 reference statements)

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“…Similarly, N 2 O decomposition is much enhanced by nickel cobaltite (Ni x Co 1-x Co 2 O 4 ) as compared to pure NiO and Co 3 O 4 catalysts with the catalyst activity depending on the ratio of Ni 2+ to Co 2+ . [ 104 ] The improvement of Ni-Co bimetallic oxides is related to the role of Ni content in enhancing the reduction reaction of Co 3+ to Co 2+ , decreasing crystallite sizes, and increasing BET values. Buvaneswari and co-workers found that NiCo 2 O 4 powder effi ciently catalyses the reduction of p-nitrophenol to p-aminophenol by NaBH 4 at room temperature without any solvent.…”

Section: Heterogeneous Catalysismentioning

confidence: 99%

Nickel Cobaltite Nanostructures for Photoelectric and Catalytic Applications

Liu

et al. 2015

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Bimetallic oxide nickel cobaltite (NiCo2 O4 ) shows extensive potential for innovative photoelectronic and energetic materials owing to their distinctive physical and chemical properties. In this review, representative fabrications and applications of NiCo2 O4 nanostructures are outlined for photoelectronic conversion, catalysis, and energy storage, aiming to promote the development of NiCo2 O4 nanomaterials in these fields through an analysis and comparison of their diverse nanostructures. Firstly, a brief introduction of the spinel structures, properties, and morphologies of NiCo2 O4 nanomaterials are presented. Then, the advanced progress of NiCo2 O4 nanomaterials for both photoelectronic conversion and energy fields is summarized including such examples as solar cells, electrocatalysis, and lithium ion batteries. Finally, further prospects and promising developments of NiCo2 O4 nanomaterials in these significant fields are proposed.

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Section: Heterogeneous Catalysismentioning

confidence: 99%

Nickel Cobaltite Nanostructures for Photoelectric and Catalytic Applications

Liu

et al. 2015

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138

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“…The low-temperature catalytic decomposition of N 2 O (up to 450°C) to nitrogen and oxygen offers attractive solution for decreasing N 2 O emissions in tail gas from nitric acid production plants. Among a large number of catalysts tested for the decomposition of N 2 O, cobalt spinels presented excellent catalytic activities which makes them promising for practical application in abatement of N 2 O emitted in waste gases from HNO 3 production plants [3][4][5]. To the best of our knowledge, only two research groups reported on manufacturing of shaped cobalt spinel based catalysts in pilot plant scale conditions [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Advantage of the single pellet string reactor for testing real-size industrial pellets of potassium-doped CoMnAl catalyst for the decomposition of N2O

Klyushina

Pacultová

Obalová

2015

Reac Kinet Mech Cat

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Two tubular laboratory reactors, the single pellet string reactor (i.d. = 0.55 cm) and the fixed bed reactor (i.d. = 5 cm) were compared on the basis of laboratory experiments of N 2 O catalytic decomposition and measurements of residence time distribution curves. K/Co 4 MnAlO x mixed oxide in the form of cylinders (5.1 mm 9 5.1 mm) was used as a catalyst. The influence of external diffusion, deviation from plug flow and influence of axial dispersion on N 2 O conversion obtained in both reactors were discussed. The influence of macroscopic phenomena on the rate of catalytic reaction was significantly lower in the single pellet string reactor, which predetermined it as a suitable laboratory reactor for testing of real-size industrial catalysts. Experimentally obtained results were confirmed by mathematical modeling.Keywords Single pellet string reactor Á Fixed bed reactor Á External diffusion Á Axial dispersion Á Peclet number Á RTD List of symbolsKnudsen diffusivity (m 2 s -1 ) D ij Binary diffusion coefficient of molecular diffusivity (m 2 s -1 )

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“…The reported N 2 O decomposition mechanism on various metal oxide catalysts involves the following steps: (i) N 2 O adsorption via electron donation from the catalyst surface to the adsorbate; (ii) N-O bond destabilization, which leads to its scission and the liberation of N 2 molecule and the formation of an adsorbed O´species; and (iii) recombination of two O´species and desorption of one oxygen molecule. Thus, this reaction requires the coexistence of a redox couple on the catalysts surfaces, such as Co 2+ -Co 3+ [7][8][9][10][11][12][13][14][15][16]43], Cu + -Cu ++ [21,22], Ni 0 -Ni 2+ [23,24]. In this respect, our XPS analysis (Figure 7) revealed the presence of Ni 0 -Ni 2+ redox couple on the surfaces of bare NiO and Gd-promoted NiO.…”

Section: Catalytic Activity Measurementsmentioning

confidence: 73%

“…However, the activity of the present catalysts is comparable with the activities of other active catalysts measured at similar reaction conditions. For Cu x Co 1-x Co 2 O 4 and Ni x Co 1-x Co 2 O 4 (0.0 ď x ď 1.0) spinel-oxide catalysts, the highest activity (100% convesion) was obtained at 500˝C by the catalysts with x = 0.75 and 0.50, respectively [7,8]. Among a series of alkali-doped NiO catalysts, the K-and Cs-promoted catalysts (M/Ni molar ratio = 0.05) showed the highest activity levels [24].…”

Section: Introductionmentioning

confidence: 99%

Rare Earth-Promoted Nickel Oxide Nanoparticles as Catalysts for N2O Direct Decomposition

et al. 2016

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Abstract:For this paper, a series of rare earth (Gd, La, Sm) promoted NiO catalysts were prepared by using the microwave-assisted precipitation method and tested for N 2 O direct decomposition. The obtained solids have been characterized by using various techniques. X-ray diffraction (XRD) results revealed that the incorporation of RE oxides into NiO significantly decreases its crystallite size. Field-emission scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations indicated that the addition of RE oxides swells the NiO particles yielding particles into a rice-like morphology. N 2 adsorption studies showed a sharp surface area increase as well as mesoporosity development accompanied the RE incorporation. It was found that the RE oxides significantly enhance the NiO activity.

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Pure and Ni-substituted Co3O4 spinel catalysts for direct N2O decomposition

Cited by 58 publications

References 40 publications

Nickel Cobaltite Nanostructures for Photoelectric and Catalytic Applications

Nickel Cobaltite Nanostructures for Photoelectric and Catalytic Applications

Advantage of the single pellet string reactor for testing real-size industrial pellets of potassium-doped CoMnAl catalyst for the decomposition of N2O

Rare Earth-Promoted Nickel Oxide Nanoparticles as Catalysts for N2O Direct Decomposition

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