Potassium-doped Co3O4 catalyst for direct decomposition of N2O

Asano, Kimihiro; Ohnishi, Chie; Iwamoto, Satoshi; Shioya, Yasushi; Inoue, Masashi

doi:10.1016/j.apcatb.2007.09.016

Cited by 207 publications

(130 citation statements)

References 43 publications

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“…Moreover, the N 2 O conversion shifted to higher temperature side over CoK-MOR catalyst, suggesting the inhibition effect of K over the activity of Co-MOR for N 2 O decomposition. This phenomenon is opposite with other findings which have reported that alkali metals like K could promote the activity of a Co 3 O 4 or cobalt-cerium composite oxide catalysts for N 2 O decomposition [25,26]. It is proposed that the redox ability of active site Co 2+ was greatly improved by K, which acts as electronic promoters.…”

Section: Catalytic Activities Of Comor Catalystscontrasting

confidence: 56%

Promotional effects and mechanism of second cations on activity and stability of Co-MOR for nitrous oxide decomposition: UV–Vis spectroscopy and EXAFS analysis

Zhang

Shen

et al. 2013

Chemical Engineering Journal

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Section: Catalytic Activities Of Comor Catalystscontrasting

confidence: 56%

Promotional effects and mechanism of second cations on activity and stability of Co-MOR for nitrous oxide decomposition: UV–Vis spectroscopy and EXAFS analysis

Zhang

Shen

et al. 2013

Chemical Engineering Journal

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“…It was reported that promotion of the various transition metal oxide-based catalysts with alkali metals salts resulted in their activation in the N 2 O decomposition reaction [32]. The influence of potassium addition on the catalytic activity was studied for the hydrotalcite samples calcined at 800°C.…”

Section: Catalytic Testsmentioning

confidence: 99%

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

Chmielarz

Rutkowska

Kuśtrowski

et al. 2011

J Therm Anal Calorim

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Hydrotalcite-like materials containing apart from magnesium and aluminum also copper, cobalt, nickel, and iron were prepared by a co-precipitation method. Thermal transformations of hydrotalcite-like materials were studied by thermal analysis methods as well as XRD, UV-vis-DRS, and XPS measurements of the samples calcined at various temperatures (600, 700, and 800°C). Calcined hydrotalcites, especially those containing cobalt and copper, were found to be active and selective catalysts of N 2 O decomposition. It was shown that an increase in the calcination temperature significantly activated the Co-containing catalysts. Promotion of the samples with potassium resulted in activation of the hydrotalcite-based catalysts.

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“…Pure , [17] partially substituted (M x Co 1Àx Co 2 O 4 ; M= Ni, Mg, Zn), [18,19] alkali-doped [20][21][22][23][24] , and supported [25] The perfect, defective, and partially substituted (110) surfaces were modeled using a periodically repeated slab with five layers. The middle layer was fixed and the other four layers were fully relaxed.…”

Section: Introductionmentioning

confidence: 99%

A DFT Study of CO Catalytic Oxidation by N₂O or O₂ on the Co₃O₄(110) Surface

Yang

et al. 2009

ChemCatChem

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The reaction mechanisms for CO catalytic oxidation by N2O or O2 on the Co3O4(110) surface were studied by DFT slab calculations. CO chemisorbs preferably at a surface Co3+ site. After the Co3+ site is completely covered, CO adsorbs at the neighboring twofold coordinated surface oxygen atom bonded to Co2+ and Co3+ cations, resulting in the formation of CO2 and an oxygen vacancy with a low energy barrier of 0.033 eV, which rationalizes the experimental observation that Co3O4‐based systems are active for CO oxidation at low temperatures. N2O or O2 interacts with the oxygen vacancy site to regenerate the surface, leaving N2 or the activated O2− species to be attacked by the second CO to yield CO2 to proceed with the catalytic cycle. The CO oxidation reaction follows the Mars– van Krevelen mechanism.

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Potassium-doped Co3O4 catalyst for direct decomposition of N2O

Cited by 207 publications

References 43 publications

Promotional effects and mechanism of second cations on activity and stability of Co-MOR for nitrous oxide decomposition: UV–Vis spectroscopy and EXAFS analysis

Promotional effects and mechanism of second cations on activity and stability of Co-MOR for nitrous oxide decomposition: UV–Vis spectroscopy and EXAFS analysis

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

A DFT Study of CO Catalytic Oxidation by N₂O or O₂ on the Co₃O₄(110) Surface

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Potassium-doped Co3O4 catalyst for direct decomposition of N2O

Cited by 207 publications

References 43 publications

Promotional effects and mechanism of second cations on activity and stability of Co-MOR for nitrous oxide decomposition: UV–Vis spectroscopy and EXAFS analysis

Promotional effects and mechanism of second cations on activity and stability of Co-MOR for nitrous oxide decomposition: UV–Vis spectroscopy and EXAFS analysis

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

A DFT Study of CO Catalytic Oxidation by N2O or O2 on the Co3O4(110) Surface

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A DFT Study of CO Catalytic Oxidation by N₂O or O₂ on the Co₃O₄(110) Surface