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Ohtsuka, Hirofumi; Tabata, Takeshi; Okada, Osamu; Sabatino, L.; Bellussi, Giuseppe

doi:10.1023/a:1018929109542

Cited by 85 publications

(37 citation statements)

References 15 publications

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“…The proceeding of reactions (R1) and (R2) is strongly affected by the nature of the cobalt species on the catalysts, which is, in turn, influenced by the amount of cobalt content [13,56,57]. High concentration of cobalt in Co10/ZrSBADP2 results in the formation of cobalt species which has weak interactions with the support and can be easily reduced at low temperature.…”

Section: Effect Of Cobalt Contentmentioning

confidence: 99%

“…Amongst, zeolite-supported cobalt catalyst has exhibited promising results in NO reduction with propane [7][8][9] that is the main component of unburned hydrocarbons in lean-burn gas, diesel and natural gas-fueled appliances exhausts [10][11][12][13]. Shichi et al [7] reported that Co-MFI zeolite catalyst had 30% and 80% NO conversion at 350 and 400 , respectively.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High Zr-loaded SBA-15 cobalt catalyst for efficient NOx reduction in lean-burn exhaust

Sabbaghi

Lam

2015

Applied Catalysis A: General

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Section: Effect Of Cobalt Contentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Zr-loaded SBA-15 cobalt catalyst for efficient NOx reduction in lean-burn exhaust

Sabbaghi

Lam

2015

Applied Catalysis A: General

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“…This improvement in performances for NO reduction by CH 4 has been attributed to a redistribution of Co ions over the different zeolite exchange sites, usually assigned as a, b and g. Co-BEA zeolites have been tested in the SCR of NO with methane which revealed poor results. On the contrary, studies performed in the presence of propane showed to be promising [14].…”

Section: Introductionmentioning

confidence: 97%

SCR of NO with methane over Co-HBEA and PdCo-HBEA catalysts

et al. 2005

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“…At room temperature, only bands at 672, 603, 509, and 468 cm À1 were observed, which were assigned to Co 3 O 4 . [32] No features of adsorbed oxygen species, which were expected at about 1128 and 883 cm À1 , [30,31] were observed. Thus, the contribution of the adsorbed oxygen species for CO oxidation could be considered negligible for our Co 3 O 4 nanowires.…”

mentioning

confidence: 95%

Iodine‐ion‐induced Size‐tunable Co₃O₄ Nanowires and the Size‐dependent Catalytic Performance for CO Oxidation

Zhu

Guo

et al. 2013

ChemCatChem

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CO oxidation is one of the most important catalytic reactions owing primarily to its relevance in practical applications in carexhaust emission control, [1] fuel cells, [2] and air purification. [3][4] Meanwhile, scientifically, it is one of the simplest catalytic reactions and thus is widely used as a model system to understand heterogeneous catalysis. [5][6][7][8] Gold nanoparticles deposited on various metal oxides that show high activity for CO oxidation have aroused tremendous interest since Haruta et al. reported that gold nanoparticles show high activity for CO oxidation. [9][10][11] Owing to the high cost of gold-based catalysts, other alternatives would be highly desirable. [12][13][14][15][16][17] As an alternative, Co 3 O 4 has been also been considered as a catalyst for CO oxidation. [12,13,18,19] Many groups have tried to control the shape of the catalyst to obtain higher catalytic efficiency, since the activity for CO oxidation strongly depends on the exposed specific crystal planes. [12,19] Moreover, several groups have synthesized small Co 3 O 4 nanoparticles that displayed much higher catalytic activity, [13,18] Figure 1 are the as-synthesized Co(CO 3 ) 0.5 -(OH)·0.11 H 2 O nanowires with the addition of NaI. The crystal phase of the as-synthesized product is determined by X-ray diffraction (XRD), with the result shown in Figure 1 a. All the identified peaks can be assigned to pure orthorhombic Co-(CO 3 ) 0.5 (OH)·0.11 H 2 O.[20] It is clear from the panoramic view (Figure 1 b) that the Co(CO 3 ) 0.5 (OH)·0.11 H 2 O nanowires comprise an uniform dandelion-like microsphere and the nanowires are uniform with 4 mm in length. Such a 1 D nanostructure is also revealed under transmission electron microscope (TEM). Under a higher magnification, these nanowires are shown to have a needle-like structure along the axial direction, and the diameter is approximately 17 nm with a smooth surface (Figure 1 c). The exposed crystal surfaces of the nanowires are (0 1 0) and (0 0 1) planes grown along the [1 0 0] direction (Figure 1 d, 1 e). Interestingly, when the samples are synthesized in the absence of NaI, the Co(CO 3 ) 0.5 (OH)·0.11 H 2 O nanowires could still be generated with the diameters of 130 nm (Supporting Information, Figure S1 e). Moreover, their arrangement is disordered and the dandelion-like microspheres no longer form (Supporting Information, Figure S1 a).Several template-free methods have been successfully applied to synthesize self-assembled structures of materials. [21][22][23][24][25][26] However, to be able to synthesize complex nanostructures of cobalt-based materials, generally high temperature and especially long reaction times are needed. [20,24,27] It was, therefore, necessary to develop a simple and effective method that could to synthesize complex cobalt-based nanostructures on a largescale in a short time. In our strategy, the formation of self-assembled Co(CO 3 ) 0.5 (OH)·0.11 H 2 O structures is faster and strongly depends on the presence of I À ions. Shown in Scheme 1 are the diff...

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Cited by 85 publications

References 15 publications

High Zr-loaded SBA-15 cobalt catalyst for efficient NOx reduction in lean-burn exhaust

High Zr-loaded SBA-15 cobalt catalyst for efficient NOx reduction in lean-burn exhaust

SCR of NO with methane over Co-HBEA and PdCo-HBEA catalysts

Iodine‐ion‐induced Size‐tunable Co₃O₄ Nanowires and the Size‐dependent Catalytic Performance for CO Oxidation

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Untitled

Cited by 85 publications

References 15 publications

High Zr-loaded SBA-15 cobalt catalyst for efficient NOx reduction in lean-burn exhaust

High Zr-loaded SBA-15 cobalt catalyst for efficient NOx reduction in lean-burn exhaust

SCR of NO with methane over Co-HBEA and PdCo-HBEA catalysts

Iodine‐ion‐induced Size‐tunable Co3O4 Nanowires and the Size‐dependent Catalytic Performance for CO Oxidation

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Iodine‐ion‐induced Size‐tunable Co₃O₄ Nanowires and the Size‐dependent Catalytic Performance for CO Oxidation