Preparation of Co3O4 Catalysts for Direct Decomposition of Nitrous Oxide under Industrial Conditions

Ohnishi, Chie; Asano, Kimihiro; Iwamoto, Satoshi; Chikama, Katsumi; Inoue, Masashi

doi:10.1016/s0167-2991(06)80975-4

Cited by 17 publications

(6 citation statements)

References 17 publications

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“…50,163,177,186 For instance, it was determined that the deN 2 O performance of Co 3 O 4 prepared by precipitation is strongly affected by alkali species involved in precipitation agent, which are not completely removed during the preparation procedure. 50,186,192 Hence, particular attention should be paid on deN 2 O catalyst preparation as well as on the interpretation of the promotional effects.…”

Section: Tailoring the Local Surface Structure Of Mixed Oxides (Mos)mentioning

confidence: 99%

Recent Advances on Nitrous Oxide (N₂O) Decomposition over Non-Noble-Metal Oxide Catalysts: Catalytic Performance, Mechanistic Considerations, and Surface Chemistry Aspects

2015

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Nitrous oxide (N 2 O) is the largest stratospheric-ozone-depleting substance, being concomitantly the third most potent greenhouse gas. The direct catalytic decomposition of N 2 O (deN 2 O process) is one of the most promising remediation technologies for N 2 O emissions abatement. Although noble metals (NMs)-based catalysts demonstrate satisfactory deN 2 O performance, their high cost and sensitivity to various effluent stream components (e.g., water vapor, oxygen) limit their widespread industrial applications. Hence, the development of NMs-free catalysts of low cost and satisfactory deN 2 O performance is of paramount importance. This survey appraises the recent advances, which have been reported since 2000, on N 2 O decomposition over non-noble-metal oxidic catalysts. Initially, a brief overview of N 2 O sources, environmental consequences, and remediation technologies is provided. The literature related to the deN 2 O process over NMs-free metal oxides (MOs) is categorized and critically discussed, as follows: (i) bare oxides, (ii) hexaaluminates, (iii) hydrotalcites, (iv) spinels, (v) perovskites, and (iv) mixed metal oxides not belonging in the above categories. This review covers several aspects with respect to the reaction mechanisms, the structure−activity correlations, the role of various inhibitors (e.g., O 2 , NO, H 2 O) as well as the strategies followed to adjust the local surface structure of MOs. Fundamental insights toward fine-tuning of surface chemistry of MOs by means of advanced preparation routes and/or electronic promotion are also provided, paving the way for real-life energy and environmental applications, beyond the deN 2 O process.

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Section: Tailoring the Local Surface Structure Of Mixed Oxides (Mos)mentioning

confidence: 99%

Recent Advances on Nitrous Oxide (N₂O) Decomposition over Non-Noble-Metal Oxide Catalysts: Catalytic Performance, Mechanistic Considerations, and Surface Chemistry Aspects

2015

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“…One of the simple promising generic systems exhibiting high catalytic activity in this reaction is cobalt spinel [16,17,18,19,20], which can be additionally modified by structural [21,22,23,24] and surface donation [24,25,26,27,28] …”

Section: Introductionmentioning

confidence: 99%

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

Grzybek

Stelmachowski

Gudyka

et al. 2016

Applied Catalysis B: Environmental

109

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dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: the role of the interface periphery, Applied Catalysis B, Environmental http://dx.doi.org/10. 1016/j.apcatb.2015.07.027 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. The catalytic tests in deN 2 O reaction revealed that the 10 wt.% of cobalt spinel in supported system is able to reproduce the activity of bare Co 3 O 4 catalyst. However, it was found that the catalyst with the lowest content of Co 3 O 4 equal to 1 wt.% exhibits the highest apparent reaction rate per mass of the spinel active phase. The observed activity was explained basing on the transmission electron microscopy analysis in terms of the dispersion of spinel phase over ceria support. A simple model that accounts for the observed strong dispersion effect is proposed. It consists in a two-step mechanism, where N 2 O is dissociated on the spinel nanograins and the resultant oxygen species are preferentially recombined at the Co 3 O 4 /CeO 2 interface periphery.

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“…with Na 2 CO 3 and were thoroughly washed, the alkali content in the Co 3 O 4 catalyst depended on the crystal structure of the precursor, thus precipitation conditions affecting the catalyst activity [31]. The Co 3 O 4 catalyst promoted by a proper amount of alkali ions is quite effective for the direct decomposition of N 2 O in the presence of oxygen [32], maintaining its activity at least for 12 h in the presence of both oxygen and water.…”

Section: Introductionmentioning

confidence: 99%

Optimized synthesis method for K/Co3O4 catalyst towards direct decomposition of N2O

et al. 2010

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The potassium-doped Co 3 O 4 catalysts were prepared by impregnation of potassium sources on commercial cobalt carbonate and on the precursors synthesized by homogeneous precipitation, combustion with glycine, gradual oxidation, and hydrothermal methods. The activities of these catalysts for the direct decomposition of nitrous oxide in the presence of oxygen with or without water vapor were examined. The effects of potassium sources on the catalyst activity were also examined by impregnation of various potassium salts on commercial cobalt carbonate. The catalyst prepared by impregnation of an aqueous solution of KOH on commercial cobalt carbonate showed the highest activity. The catalysts prepared by various methods were analyzed by powder X-ray diffraction, N 2 adsorption, scanning electron microscope, temperature-programmed reduction with H 2 , temperature-programmed desorption of O 2 , and X-ray photoelectron spectroscopy. These results suggest that crystallite size and reduction property are key factors for the activity of the catalyst for the direct decomposition of nitrous oxide in the presence of oxygen.

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Preparation of Co3O4 Catalysts for Direct Decomposition of Nitrous Oxide under Industrial Conditions

Cited by 17 publications

References 17 publications

Recent Advances on Nitrous Oxide (N₂O) Decomposition over Non-Noble-Metal Oxide Catalysts: Catalytic Performance, Mechanistic Considerations, and Surface Chemistry Aspects

Recent Advances on Nitrous Oxide (N₂O) Decomposition over Non-Noble-Metal Oxide Catalysts: Catalytic Performance, Mechanistic Considerations, and Surface Chemistry Aspects

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

Optimized synthesis method for K/Co3O4 catalyst towards direct decomposition of N2O

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Preparation of Co3O4 Catalysts for Direct Decomposition of Nitrous Oxide under Industrial Conditions

Cited by 17 publications

References 17 publications

Recent Advances on Nitrous Oxide (N2O) Decomposition over Non-Noble-Metal Oxide Catalysts: Catalytic Performance, Mechanistic Considerations, and Surface Chemistry Aspects

Recent Advances on Nitrous Oxide (N2O) Decomposition over Non-Noble-Metal Oxide Catalysts: Catalytic Performance, Mechanistic Considerations, and Surface Chemistry Aspects

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

Optimized synthesis method for K/Co3O4 catalyst towards direct decomposition of N2O

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Product

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Recent Advances on Nitrous Oxide (N₂O) Decomposition over Non-Noble-Metal Oxide Catalysts: Catalytic Performance, Mechanistic Considerations, and Surface Chemistry Aspects

Recent Advances on Nitrous Oxide (N₂O) Decomposition over Non-Noble-Metal Oxide Catalysts: Catalytic Performance, Mechanistic Considerations, and Surface Chemistry Aspects