Role of supported metals in the selective reduction of nitrogen monoxide with hydrocarbons over metal/alumina catalysts

Hamada, Hideaki; Kintaichi, Yoshiaki; Inaba, Megumu; Tabata, Mitsunori; Yoshinari, Takehisa; Tsuchida, Hiroshi

doi:10.1016/0920-5861(95)00263-4

Cited by 110 publications

(35 citation statements)

References 6 publications

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“…3,4 Li and Armor also reported that oxide-supported cobalt (Co/SiO 2 , Co/Al 2 O 3 ) is thoroughly inactive. 5 However, more recently, Inaba et al 6,7 have demonstrated that Co/SiO 2 and Co/Al 2 O 3 catalysts synthesized by impregnation of the respective supports with a cobalt acetate solution (which ensures a high cobalt dispersion) are highly active catalysts in SCR by methane. Samples obtained by impregnation with cobalt nitrate are inactive, in agreement with the observations of Li and Armor.…”

Section: Introductionmentioning

confidence: 98%

FTIR mechanistic studies on the selective catalytic reduction of NO_x by methane and ethane over supported cobalt catalysts

Hadjiivanov¹,

Tsyntsarski²,

Ivanova³

et al. 2001

Surface & Interface Analysis

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The NO x species formed after NO adsorption and NO + O 2 co-adsorption on Co-ZSM-5, CoY, Co/SiO 2 (high cobalt dispersion) and Co/SiO 2 (low cobalt dispersion) were studied by means of IR spectroscopy. It was found that NO adsorption on all samples leads to the formation of Co 2+ (NO) 2 species, which are stable on Co-ZSM-5 and CoY but are destroyed during evacuation on Co/SiO 2 . The stable species produced upon NO + O 2 co-adsorption are different kinds of surface NO x − anionic species. The principal compounds formed on Co-ZSM-5 and Co/SiO 2 with a high cobalt dispersion are surface monodentate nitrates, characterized by an IR band at ∼1535 cm −1 . These nitrates are thermally stable but easily interact with hydrocarbons which confirms that they are key species in selective catalytic reduction (SCR). No monodentane nitrates are formed on CoY and Co/SiO 2 with a low cobalt dispersion, which accounts for the low SCR activity reported for such samples.

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Section: Introductionmentioning

confidence: 98%

FTIR mechanistic studies on the selective catalytic reduction of NO_x by methane and ethane over supported cobalt catalysts

Hadjiivanov¹,

Tsyntsarski²,

Ivanova³

et al. 2001

Surface & Interface Analysis

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“…2 However, it has been demonstrated recently that transition metal cations supported on oxides could also manifest a high catalytic activity but only when the active phase is highly dispersed. 4,5 Otherwise, the full oxidation of the hydrocarbons is favoured.…”

Section: Introductionmentioning

confidence: 98%

Combined TPD and FTIR studies of Co/ZrO₂ catalysts: determination of the cobalt dispersion

Hadjiivanov

Panayotov

Avreyska

et al. 2002

Surface & Interface Analysis

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“…Co 3 O 4 is very attractive for applications involving oxidation reactions because of the presence of mobile oxygen, such as the use of unsupported cobalt oxide as an active catalyst in air pollution control for the abatement of CO [12], NO x [13] and organic pollutants from effluent streams [14]. Co 3 O 4 is an important magnetic p-type semiconductor, which belongs to the normal spinel crystal structure based on a cubic close packing array of oxide ions, in which Co(II) ions occupy the tetrahedral 8a sites and Co(III) ions occupy the octahedral 16d sites [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Co3O4 nanoparticles by oxidation-reduction method and its magnetic characterization

et al. 2009

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Without any surfactant, antiferromagnetic Co 3 O 4 nanoparticles were synthesized successfully for the first time by means of an oxidation-reduction method with cobalt sulfate as starting material, which was oxidized to cobalt salt by NaNO 3 after alkalinizing with NaOH. Morphological, structural, spectroscopic and magnetic characterization of the product were done by SEM, TEM, XRD, and VSM, respectively. The average crystallite size (on the base of line profile fitting method), D and σ, is estimated as 30 ± 6 nm. Some anomalous magnetic properties and their enhanced effect have been observed in Co 3 O 4 antiferromagnetic nanocrystallites, including a bias field, coercivity, permanent magnetic moments and an open loop. These phenomena are attributed to the unidirectional anisotropy which is caused by the exchange coupling between AFM and FM layers, the existence of the spin glass like surface spins of Co 3 O 4 nanoparticles due to size effects and surface-area effect.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Role of supported metals in the selective reduction of nitrogen monoxide with hydrocarbons over metal/alumina catalysts

Cited by 110 publications

References 6 publications

FTIR mechanistic studies on the selective catalytic reduction of NO_x by methane and ethane over supported cobalt catalysts

FTIR mechanistic studies on the selective catalytic reduction of NO_x by methane and ethane over supported cobalt catalysts

Combined TPD and FTIR studies of Co/ZrO₂ catalysts: determination of the cobalt dispersion

Synthesis of Co3O4 nanoparticles by oxidation-reduction method and its magnetic characterization

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Role of supported metals in the selective reduction of nitrogen monoxide with hydrocarbons over metal/alumina catalysts

Cited by 110 publications

References 6 publications

FTIR mechanistic studies on the selective catalytic reduction of NOx by methane and ethane over supported cobalt catalysts

FTIR mechanistic studies on the selective catalytic reduction of NOx by methane and ethane over supported cobalt catalysts

Combined TPD and FTIR studies of Co/ZrO2 catalysts: determination of the cobalt dispersion

Synthesis of Co3O4 nanoparticles by oxidation-reduction method and its magnetic characterization

Contact Info

Product

Resources

About

FTIR mechanistic studies on the selective catalytic reduction of NO_x by methane and ethane over supported cobalt catalysts

FTIR mechanistic studies on the selective catalytic reduction of NO_x by methane and ethane over supported cobalt catalysts

Combined TPD and FTIR studies of Co/ZrO₂ catalysts: determination of the cobalt dispersion