Unsupported MoO3Fe2O3 catalysts: characterization and activity during 2-propanol decomposition

Al‐Shihry, Shar S.; Halawy, Samih A.

doi:10.1016/s1381-1169(96)00155-0

Cited by 30 publications

(19 citation statements)

References 48 publications

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“…In case of the MoFe5-673 catalyst, the XPS results show that also its surface is mainly composed of Mo VI species, which are below the XRD detection limit. Less than 10 % of Mo V species were detected on the samples studied (Figure 3 B, Table S1) in agreement with the results reported by Al-Shihry et al [25] The presence of Mo V points to an influence of the a-Fe 2 O 3 core enhancing the reducibility of Mo VI . In addition, the Mo 3d peak width (FWHM) shows a decrease with increasing film thickness of MoO 3 (Table S1).…”

supporting

confidence: 91%

Thin‐film β‐MoO₃ Supported on α‐Fe₂O₃ as a Shell–Core Catalyst for the Selective Oxidation of Methanol to Formaldehyde

et al. 2012

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An MO for Mo: β‐MoO3/α‐Fe2O3 catalysts synthesized by chemical vapor deposition exhibit a uniform shell–core structure. The structure of the metastable β‐MoO3 film is retained even after calcination in air at 873 K, owing to strong MoOFe links at the interface. The shell–core β‐MoO3/α‐Fe2O3 catalysts are much more active than, and comparably selective to, the reference α‐MoO3 catalyst in the selective oxidation of methanol to formaldehyde.

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confidence: 91%

Thin‐film β‐MoO₃ Supported on α‐Fe₂O₃ as a Shell–Core Catalyst for the Selective Oxidation of Methanol to Formaldehyde

et al. 2012

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“…All spectra were calibrated by a C 1s peak located at 284.6 eV. The XPS results show that the binding energy of Mo 4+ 3d 3/2, Mo 4+ 3d 5/2, Mo 6+ 3d 3/2, S 2p 1/2, S 2p 3/2, O 1s, Ti 2p ½, and Ti 2p 3/2 peaks in the TiO 2 /MoS 2 composites are located at 232.5, 228.1, 236.5, 162.4, 165.0, 530.3, 464.0, and 458.5 eV, respectively, suggesting that Mo 4+ , Mo 6+ , and S 2– exist in the TiO 2 /MoS 2 composites and indicating some molybdenum oxide (Mo 4+ , Mo 6+ ) species have been formed on the surface of catalysts due to the oxygen oxidation under hydrothermal conditions . In the hydrothermal procedure, the MoS 2 nanostructure could be formed on the surface of the TiO 2 /MoS 2 composites based on the recombination of dissociative Mo 4+ and S 2– …”

Section: Resultsmentioning

confidence: 99%

Fabrication of TiO₂/MoS₂ Composite Photocatalyst and Its Photocatalytic Mechanism for Degradation of Methyl Orange under Visible Light

et al. 2015

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A novel TiO2/MoS2 composite photocatalyst with high visible‐light activity was prepared via a one‐step hydrothermal process using titaniumtetrachloride (TiCl4) as a titanium resource and bulk MoS2 as a direct photosensitizer. The photocatalytic degradation of methyl orange (MO) in aqueous suspension was employed to evaluate the visible light activity of the as‐prepared composite photocatalyst with a xenon lamp as simulated solar irradiation. The chemical composition, optical properties, morphology, structure, and thermal stability of the composite photocatalysts were characterized using XPS, UV‐vis, FS, SEM, XRD, and TGA. The as‐prepared photocatalysts exhibited enhanced photocatalytic activity from the experiment on the degradation of methyl orange, compared to the performance of commercial titania (Degussa P25). The degradation rate of MO can reach over 90 % in 10 min when the molar ratio of molybdenum disulfide (MoS2) to titanium dioxide (TiO2) is 0.8:50 and the mass concentration of the TiO2/MoS2 composite photocatalyst is 400 mg/L. In this research, a new fabrication mode of TiO2/MoS2/TiO2 was applied for fabricating new hybridized structures of nano‐TiO2/MoS2 by using bulk MoS2 as a direct photosensitizer, which changed the energy levels of the conduction band of MoS2 and strongly promoted interparticle electron transfer. In addition, this hybridization structure was believed to have a synergistic effect in the process of photocatalytic oxidation owing to increasing the degree of charge carrier separation, which effectively reduced recombination and improved the photocatalytic activity of the TiO2/MoS2 composite photocatalyst.

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“…These reactions lead mostly to olefins and ethers in the case of dehydration, or aldehydes and ketones in the process of dehydrogenation. As follows from literature data, decomposition of isopropanol via the first of these reactions in the presence of inorganic catalysts (metal oxides) runs with involvement of mainly acidic centres, whereas via the other preferentially with involvement of basic ones [5]. This rule is well satisfied for the basic catalysts such as MgO [6] or the acidic ones such as CrAPO-5 [2].…”

Section: Introductionmentioning

confidence: 54%

Activated Carbon Modified with Different Chemical Agents as a Catalyst in the Dehydration and Dehydrogenation of Isopropanol

2008

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Activated carbons modified with different chemical agents such as HNO 3 , H 2 SO 4 , peroxyacetic acid (PAA), air, NH 3 and Cl 2 have been tested as catalysts in decomposition (dehydration and dehydrogenation) of isopropanol. The majority of the samples obtained have been characterised by well-developed microporous surface with a small contribution of mesopores (8-18%). The influence of the surface area of the samples on their catalytic performance has been insignificant. The carbon oxidation with oxidants in the liquid or gas phase leads to an increased catalytic activity and the dominant process is dehydration of the alcohol studied. Carbon modification by contact with gas ammonia or chlorine results in a decrease in the catalytic activity and a significant increase in the contribution of dehydrogenation of isopropanol. It has been shown that such behaviour of the catalysts has been a consequence of changes in the acid-base character of the carbons induced by their modification.

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Unsupported MoO3Fe2O3 catalysts: characterization and activity during 2-propanol decomposition

Cited by 30 publications

References 48 publications

Thin‐film β‐MoO₃ Supported on α‐Fe₂O₃ as a Shell–Core Catalyst for the Selective Oxidation of Methanol to Formaldehyde

Thin‐film β‐MoO₃ Supported on α‐Fe₂O₃ as a Shell–Core Catalyst for the Selective Oxidation of Methanol to Formaldehyde

Fabrication of TiO₂/MoS₂ Composite Photocatalyst and Its Photocatalytic Mechanism for Degradation of Methyl Orange under Visible Light

Activated Carbon Modified with Different Chemical Agents as a Catalyst in the Dehydration and Dehydrogenation of Isopropanol

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Unsupported MoO3Fe2O3 catalysts: characterization and activity during 2-propanol decomposition

Cited by 30 publications

References 48 publications

Thin‐film β‐MoO3 Supported on α‐Fe2O3 as a Shell–Core Catalyst for the Selective Oxidation of Methanol to Formaldehyde

Thin‐film β‐MoO3 Supported on α‐Fe2O3 as a Shell–Core Catalyst for the Selective Oxidation of Methanol to Formaldehyde

Fabrication of TiO2/MoS2 Composite Photocatalyst and Its Photocatalytic Mechanism for Degradation of Methyl Orange under Visible Light

Activated Carbon Modified with Different Chemical Agents as a Catalyst in the Dehydration and Dehydrogenation of Isopropanol

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Thin‐film β‐MoO₃ Supported on α‐Fe₂O₃ as a Shell–Core Catalyst for the Selective Oxidation of Methanol to Formaldehyde

Thin‐film β‐MoO₃ Supported on α‐Fe₂O₃ as a Shell–Core Catalyst for the Selective Oxidation of Methanol to Formaldehyde

Fabrication of TiO₂/MoS₂ Composite Photocatalyst and Its Photocatalytic Mechanism for Degradation of Methyl Orange under Visible Light