Cobalt–zinc spinel dispersed over cordierite monoliths for catalytic N2O abatement from nitric acid plants

Grzybek, Gabriela; Stelmachowski, Paweł; Indyka, Paulina; Inger, Marek; Wilk, Marcin; Kotarba, Andrzej; Sojka, Zbigniew

doi:10.1016/j.cattod.2015.02.022

Cited by 30 publications

(14 citation statements)

References 26 publications

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“…Therefore, further research was focused on finding such a catalyst formula where its active phase would be the proposed doublepromoted cobalt spinel placed on the support. During the course of studies, most promising supports in terms of their applicability were specified: cordierite monoliths (Grzybek et al 2015) and aluminum oxide (Grzybek et al 2017), and the method of placing the active phase on the support and the production technology of the final catalyst formula in pilot scale was developed (Wilk et al 2016). As a result of studies, it was found that the active phase placed onto support in the amount of 20% wt.…”

Section: Introductionmentioning

confidence: 99%

The influence of NOx presence on the catalytic N2O decomposition over the supported double-promoted cobalt spinel catalyst

et al. 2019

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The supported double-promoted cobalt spinel catalyst has been tested for N 2 O decomposition in the model and real gas streams (tail gas) from nitric acid plant. Activity tests carried out in the model gas stream showed a high activity of the developed supported catalyst. However, during catalytic investigations performed under real industrial conditions it was found that this catalyst is very sensitive to NO x poisoning. The negative influence of these oxides is visible even at their low concentration. However, the stability tests performed in real nitric acid plant gas streams showed that the developed catalyst preserves its initial activity for at least 40 days. Therefore, the authors propose to apply it in a dual-bed catalytic system consisting of deNO x and deN 2 O catalyst beds. At the first stage, tail gas is purified from NO x in the NH 3-SCR process in the presence of commercial catalyst and at the second stage, catalytic decomposition of N 2 O into N 2 and O 2 takes place over the developed supported cobalt spinel catalyst. The deNO x catalyst bed applied in the proposed dual-bed catalytic system allowed for the complete conversion of NO x from the tail gases. After installation of the supported cobalt spinel catalyst downstream of the deNO x catalyst bed, a significant increase in deN 2 O catalyst activity in the real tail gas stream was observed. Under optimal conditions, this system (F = 150 L/h; T = 425-450 °C) allowed for the complete reduction of N 2 O emission. It is shown that the proposed catalytic system is robust and allows to obtain high conversions of both NO x and N 2 O.

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Section: Introductionmentioning

confidence: 99%

The influence of NOx presence on the catalytic N2O decomposition over the supported double-promoted cobalt spinel catalyst

et al. 2019

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“…Zhang et al used potassium or sodium oxide to modify Zn/MgCo samples to obtain improved activity towards N 2 O decomposition, which could be because the addition of potassium or sodium oxide decreased the binding energy and resulted in an increase in the electron density around the active Co component during the reaction. Grzybek et al found that the (Co,Zn)Co 2 O 4 /CeO 2 /cordierite catalyst prepared by the impregnation method showed good performance towards N 2 O decomposition due to the dispersion of the active spinel phase over cordierite. Hong et al indicated that the CeMn catalyst modified with alkali or alkaline earth species exhibited significant activity, and the Ba/CeMn system had the best activity.…”

Section: Introductionmentioning

confidence: 99%

“…Grzybek et al 24 found that the (Co,Zn)Co 2 O 4 /CeO 2 /cordierite catalyst prepared by the impregnation method showed good performance towards N 2 O decomposition due to the dispersion of the active spinel phase over cordierite. Hong et al 25 indicated that the Ce-Mn catalyst modified with alkali or alkaline earth species exhibited significant activity, and the Ba/Ce-Mn system had the best activity.…”

Section: Introductionmentioning

confidence: 99%

Catalytic N₂O decomposition over CeMeO_y/γ‐Al₂O₃ (Me = Mn, Cu, Zn) catalysts prepared by impregnation method

Zhang

Guo

et al. 2018

Asia-Pacific J Chem Eng

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A series of CeMeOy/γ‐Al2O3 (Me = Mn, Cu, Zn) samples for effective catalytic N2O decomposition were prepared by impregnation method with large specific surface area support. The H2‐TPR and O2/CO2‐TPD results showed that the addition of CeO2 to samples of MeOx/γ‐Al2O3 was beneficial for the reduction of catalytic components, the desorption of surface oxygen, and the total amount of basic sites on the sample surface. The characterization of TPR, TPD, and XRD, and so forth indicated that synergistic action among catalytic components on the support was probably the origin of good activity towards N2O decomposition over Ce(1.2)MeOy/γ‐Al2O3 catalyst. The test that lasted for 200 hr showed that the sample of Ce(1.2)MeOy/γ‐Al2O3 prepared by impregnation method had good stability on N2O decomposition in a mixture containing certain amounts of O2 and H2O under applied experimental conditions. The characterization results of SEM and EDX over samples before and after stability indicated that the prepared Ce(1.2)MeOy/γ‐Al2O3 catalyst had good stable structure, which would provide the basis for further study, such as pilot‐scale investigation, in this field.

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“…Supports can be inert or can interact with the active phase and influence the efficiency of catalysts. Studies of supported cobalt oxide catalysts have been already published, mainly on different monoliths [12,13] or sieves [10,14] and also tablets [15].…”

Section: Introductionmentioning

confidence: 99%

Cobalt Oxide Catalysts on Commercial Supports for N₂O Decomposition

et al. 2017

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Co3O4 oxide catalysts prepared on different commercial supports, namely, TiO2, Al2O3, and Mg‐Al mixed oxides with various Mg and Al concentrations, were characterized by atomic absorption spectrometry, Brunauer‐Emmett‐Teller method, X‐ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and H2 temperature‐programmed reduction, tested for N2O decomposition, and compared with bulk Co3O4. In spite of the fact that Co3O4/70Mg30Al also contained hardly reducible compounds, it possessed the highest catalytic activity, probably due to the presence of active sites with easier reducibility and better dispersion of the active phase on the support contributing to a higher number of active sites. The conversion over Co3O4‐supported tablets is comparable with that of the same catalyst bed of bulk Co3O4 tableted catalyst.

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Cobalt–zinc spinel dispersed over cordierite monoliths for catalytic N2O abatement from nitric acid plants

Cited by 30 publications

References 26 publications

The influence of NOx presence on the catalytic N2O decomposition over the supported double-promoted cobalt spinel catalyst

The influence of NOx presence on the catalytic N2O decomposition over the supported double-promoted cobalt spinel catalyst

Catalytic N₂O decomposition over CeMeO_y/γ‐Al₂O₃ (Me = Mn, Cu, Zn) catalysts prepared by impregnation method

Cobalt Oxide Catalysts on Commercial Supports for N₂O Decomposition

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Cobalt–zinc spinel dispersed over cordierite monoliths for catalytic N2O abatement from nitric acid plants

Cited by 30 publications

References 26 publications

The influence of NOx presence on the catalytic N2O decomposition over the supported double-promoted cobalt spinel catalyst

The influence of NOx presence on the catalytic N2O decomposition over the supported double-promoted cobalt spinel catalyst

Catalytic N2O decomposition over CeMeOy/γ‐Al2O3 (Me = Mn, Cu, Zn) catalysts prepared by impregnation method

Cobalt Oxide Catalysts on Commercial Supports for N2O Decomposition

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Catalytic N₂O decomposition over CeMeO_y/γ‐Al₂O₃ (Me = Mn, Cu, Zn) catalysts prepared by impregnation method

Cobalt Oxide Catalysts on Commercial Supports for N₂O Decomposition