Characterization of Cobalt Molybdenum Nitrides for Thiophene HDS by XRD, TEM, and XPS

Hada, Kenichiro; Tanabe, Junko; Omi, Shinzo; Nagai, Masatoshi

doi:10.1006/jcat.2001.3495

Cited by 56 publications

(27 citation statements)

References 30 publications

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“…It is clear from the gure that a single narrow doublet peak ts well the spectrum. The BE of the tted Mo 3d 5/2 is 232.5 eV with a FWHM of 2.2 eV in agreement with previous work [17]. We conclude that Mo ions in our lms are in the Mo 6+ oxidation state forming MoO 3 structure.…”

Section: Methodssupporting

confidence: 91%

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Synthesis, Structural and Optical Properties of Mo-Doped ZnO Thin Films

Mekki

Tabet

2014

Acta Phys. Pol. A

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Transparent zinc oxide thin lms doped with molybdenum have been prepared using a DC reactive magnetron sputtering on glass substrates from metallic ZnMo target. The three lms, called A, B, and C, had 1.9 at.% Mo, 2.8 at.% Mo and 4.7 at.% Mo, respectively. The composition of the lms was determined by X-ray photoelectron spectroscopy. The analysis of Mo 3d 5/2 core level spectra indicated that Mo exist in the lms in Mo 6+ oxidation state irrespective of the Mo content in the lm. The X-ray di raction spectrum of lm A showed a texture along the 002 orientation, while that of lm B showed two peaks, one at θ ≈ 34.5 • and the other at ≈ 36.5 • corresponding to 002 and 101 orientations, respectively. Film C showed two small peaks corresponding to 100 and 110 orientations. Optical measurements showed that all three lms had a transmittance of about 80%. The energy band gap showed a linear increase as Mo concentration increases from 3.29 eV to 3.38 eV. The atomic force microscopy image of lm A showed a homogeneous morphology of the surface of the lm, while the atomic force microscopy images of lms B and C showed an inhomogeneous one.

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Section: Methodssupporting

confidence: 91%

“…The Mo 3d 5/2 peak is symmetric and has a BE of about 232.5 eV for all three lms. The standard values of the BE of Mo 3d 5/2 for Mo 6+ , Mo 5+ , Mo 4+ , Mo 3+ and metallic Mo are 232.6 eV, 231.5 eV, 230.6 eV, 230 eV, and 228 eV [16,17]. It can be noted from Fig.…”

Section: Methodsmentioning

confidence: 99%

Synthesis, Structural and Optical Properties of Mo-Doped ZnO Thin Films

Mekki

Tabet

2014

Acta Phys. Pol. A

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“…The sealed reactor containing the sulfided sample was transported into a glove box under a N2 atmosphere and the samples were ground to fine powder without exposure to air. XPS measurements of the catalysts were carried out using a Shimadzu ESCA 3200 photoelectron spectrometer equipped with a magnesium source (Mg Kα 1253.6 eV) and operated at 8 kV and 30 mA under previously published conditions 27) . The binding energy of C 1 s (284.6 eV) was used as the reference to correct the binding energy of various elements on the samples.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Effects of Adding Cobalt and Potassium to MoS<sub>2</sub>-based Catalysts on Mixed Alcohol Synthesis

豊田

銭

2014

J. Jpn. Petrol. Inst.

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Several unsupported and supported molybdenum-based catalysts were prepared by precipitation and impregnation, and characterized by N2 adsorption, XRD, H2-TPR, and XPS. The catalytic activity for alcohol synthesis was evaluated using a fixed-bed pressurized flow reaction system under the following conditions: 250-350 , 5.0 MPa, GHSV of 5000 h -1, and H2/CO ratio of 1.0. Addition of Co to the unsupported MoS2-bulk catalyst enhanced the selectivity for C2 alcohols and total alcohols, and reduced the selectivity for hydrocarbons. Addition of K to Co04MoS improved the selectivity for total alcohols and suppressed the formation of hydrocarbons, increased the selectivity for methanol and CO2, and decreased carbon-chain growth. The alumina-supported catalyst was the most favorable for Fischer-Tropsch synthesis but was unfavorable for C2 alcohol synthesis. The silica-supported catalyst was more favorable for C2 alcohol synthesis than the unsupported catalyst.

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“…Usually, www.elsevier.com/locate/apcata Applied Catalysis A: General 293 (2005) [83][84][85][86][87][88][89][90] there are two ways to achieve high surface area: (i) generating the material in porous form or producing nano-structured powders via a synthesis method such as temperatureprogrammed reduction [19,20]; (ii) dispersing thecatalytically active species on a support of high surface area. The specific surface areas of unsupported carbide and nitride catalysts are within the range of 30-100 m 2 /g whereas the supported ones can have surface areas well above 100 m 2 /g [21][22][23].…”

Section: Introductionmentioning

confidence: 98%