Characterization of Cu/MCM-41 and Cu/MCM-48 mesoporous catalysts by FTIR spectroscopy of adsorbed CO

Hadjiivanov, Konstantin; Tsoncheva, Tanya; Dimitrov, Momtchil; Minchev, Christo; Knözinger, Helmut

doi:10.1016/s0926-860x(02)00510-0

Cited by 60 publications

(35 citation statements)

References 42 publications

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“…24 The small peak at 934.7 eV, characteristic of Cu(I), suggests that even at room temperature CO reduces Cu(II) to Cu(I) (Figure 5a). Similar effects for supported Cu were observed by IR spectroscopy of adsorbed CO. 26 At 403 K, the Cu(II) peak loses intensity relative to its initial intensity and the Cu(I) broadens and shifts to lower energies (Figure 5b). Even at 473 K (Figure 5c), the Cu(II) peak intensity is still noticeable, while the Cu(I) intensity increases.…”

Section: Resultsmentioning

confidence: 99%

An in situ cell for characterization of solids by soft x-ray absorption

Drake

Liu

Gilles

et al. 2004

Review of Scientific Instruments

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An in-situ cell using "lab-on-a-chip" technologies has been designed and tested for characterization of catalysts and environmental materials using soft X-ray absorption spectroscopy and spectromicroscopy at photon energies above 250 eV. The sample compartment is 1.0 mm in diameter with a gas path length of 0.8 mm to minimize X-ray absorption in the gas phase. The sample compartment can be heated to 533 K by an Al resistive heater and gas flows up to 5.0 cm 3 min -1 can be supplied to the sample compartment through microchannels. The performance of the cell was tested by acquiring Cu L 3 -edge XANES data during the reduction and oxidation of a silica- show that with increasing temperature the Cu(II) peak intensity decreases as the Cu(I) peak intensity increases.

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Section: Resultsmentioning

confidence: 99%

An in situ cell for characterization of solids by soft x-ray absorption

Drake

Liu

Gilles

et al. 2004

Review of Scientific Instruments

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“…This band is often attributed to CO adsorbed on Cu + (Cu 2 O) sites, particularly when it is stable to be heated. 26,27 When easily removable by heating, it has also been assigned to CO ). This band should be accumulation of adsorbed germinal CO on Cu sites.…”

Section: Resultsmentioning

confidence: 99%

In Situ-DRIFTS Study of Rh Promoted CuCo/Al₂O₃for Ethanol Synthesis via CO Hydrogenation

Li¹,

Ma²,

Zhang³

et al. 2014

Bulletin of the Korean Chemical Society

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The promoting effect of rhodium on the structure and activity of the supported Cu-Co based catalysts for CO hydrogenation was investigated in detail. The samples were characterized by DRIFTS, N 2 -adsorption, XRD, H 2 -TPR, H 2 -TPD and XPS. The results indicated that the introduction of rhodium to Cu-Co catalysts resulted in modification of metal dispersion, reducibility and crystal structure. DRIFTS results of CO hydrogenation at reaction condition (P=2 MPa, T=260 o C) indicated the addition of 1 wt % rhodium improved hydrogenation ability of Cu-Co catalysts. The ethanol selectivity and CO conversion were both improved by 1 wt % Rh promoted Cu-Co based catalysts. The alcohol distribution over un-promoted and rhodium promoted Cu-Co based catalysts obeys A-S-F rule and higher chain growth probability was got on rhodium promoted catalyst.

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“…The higher activity of MCM-41/CeO 2 may be due to the hexagonal ordered structured compared to MCM-48 with cubic ordered structured [21,22]. The hexagonal ordered structured of MCM-41 due to the higher dispersion of cerium on this sample.…”

Section: Photocatalytic Degradation Of Congo Redmentioning

confidence: 88%

“…The enhancements of CR degradation may be due to the high dispersion of CeO 2 in the amorphous wall of MCM-41 and MCM-48 and the increase of the bandgap between the conduction band and valance band of CeO 2 in MCMs. In addition, due to the wide bandgap of MCM-41/ CeO 2 and MCM-48/CeO 2 , the lifetime of photogenerated holes and electrons of the MCMs/CeO 2 is longer than that of CeO 2 nanoparticles [20][21][22].…”

Section: Photocatalytic Degradation Of Congo Redmentioning

confidence: 99%

Synthesis, characterization, and photocatalytic activity of MCM-41 and MCM-48 impregnated with CeO2 nanoparticles

Pouretedal

Mina

2012

Int Nano Lett

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MCM-41/CeO 2 and MCM-48/CeO 2 were synthesized by direct and indirect methods in solvent media and by grinding method in a solvent-free media. The materials prepared by grinding method are characterized by X-ray diffraction, infrared spectrum analysis, and N 2 adsorption and desorption. Surface areas and pore size of MCM-48 /CeO 2 were obtained with values of 680.9 m 2 Ág −1 and 1.64 nm, respectively, by BET method. The results showed that CeO 2 nanoparticles were introduced into MCM-41 and MCM-48, and there was formation of CeO 2 crystallites as secondary phase in the extra framework of MCM-41 and MCM-48. MCM-41/CeO 2 and MCM-48/CeO 2 materials are used as photocatalysts in degradation of Congo red as a dye pollutant. The MCM-41/CeO 2 and MCM-48/CeO 2 prepared by grinding method showed the higher photoreactivity with 97.6 % and 93.1 %, respectively, of degradation of Congo red. The higher photoreactivity is due to the complete incorporation of cerium ions in mesoporous material of MCMs in a solvent-free media.

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Characterization of Cu/MCM-41 and Cu/MCM-48 mesoporous catalysts by FTIR spectroscopy of adsorbed CO

Cited by 60 publications

References 42 publications

An in situ cell for characterization of solids by soft x-ray absorption

An in situ cell for characterization of solids by soft x-ray absorption

In Situ-DRIFTS Study of Rh Promoted CuCo/Al₂O₃for Ethanol Synthesis via CO Hydrogenation

Synthesis, characterization, and photocatalytic activity of MCM-41 and MCM-48 impregnated with CeO2 nanoparticles

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Characterization of Cu/MCM-41 and Cu/MCM-48 mesoporous catalysts by FTIR spectroscopy of adsorbed CO

Cited by 60 publications

References 42 publications

An in situ cell for characterization of solids by soft x-ray absorption

An in situ cell for characterization of solids by soft x-ray absorption

In Situ-DRIFTS Study of Rh Promoted CuCo/Al2O3for Ethanol Synthesis via CO Hydrogenation

Synthesis, characterization, and photocatalytic activity of MCM-41 and MCM-48 impregnated with CeO2 nanoparticles

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In Situ-DRIFTS Study of Rh Promoted CuCo/Al₂O₃for Ethanol Synthesis via CO Hydrogenation