Selective Oxidation of Ethanol to Acetaldehyde on V2O5/TiO2/SiO2Catalysts

Quaranta, N.; Soria, J.; Corberán, V. Cortés; Fierro, J.L.G.

doi:10.1006/jcat.1997.1760

Cited by 103 publications

(73 citation statements)

References 32 publications

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“…The chemical activation of olive stone with H 3 PO 4 produces an activated carbon with a wide microporous structure and a high apparent surface area (902 m 2 /g), higher than those corresponding to other acid catalysts reported in the literature. 8,41,42 The higher value of A BET with respect to that of A DR indicates the existence of a wide microporous structure. 43 The carbon catalyst presents also a relatively high value of the external surface area A s , of 113 m 2 /g, which is important in catalytic applications.…”

Section: Catalyst Characterizationmentioning

confidence: 97%

Kinetic study of the decomposition of 2‐butanol on carbon‐based acid catalyst

et al. 2009

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in Wiley InterScience (www.interscience.wiley.com).The catalytic conversion of 2-butanol on a carbon-based acid catalyst prepared by chemical activation of olive stone with phosphoric acid was investigated. The carbon catalyst showed a considerable amount of surface phosphorus, presumably in form of phosphate groups, as revealed by XPS, despite a washing step carried out after the activation process. Conversion of 2-butanol yields mainly dehydration products, mostly cis-2-butene and trans-2-butene with lower amounts of 1-butene, and a very small amount of mek as dehydrogenation product. Kinetic interpretation of the experimental data was performed using two elimination mechanisms for the dehydration reaction; an E1-mechanism (two-step mechanism) and an E2-mechanism (one-step mechanism). The rate expressions derived from both models fit properly the experimental results, suggesting that probably the two mechanisms occur simultaneously. This is supported by the similar rate constant obtained for the formation of the carbocation and the olefins in the E1 and E2 mechanisms, respectively. V

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Section: Catalyst Characterizationmentioning

confidence: 97%

Kinetic study of the decomposition of 2‐butanol on carbon‐based acid catalyst

et al. 2009

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“…The large widths of the V 2p lines might be also due to defects at the surface and/or disproportion at the surface [35]. The O 1s signal showed two clear peaks for silica containing samples: a major one at ca 532.9 eV (Si-O in the SiO2 lattice) and a minor one at ca 530.3 eV (vanadium bonded oxygen) [12]. In addition, for the Si-containing samples the deconvolution of the Si 2p spectra revealed one peak at the binding energy values between 103.60-103.86 eV (see Table 2.).…”

Section: Introductionmentioning

confidence: 99%

“…The support has a disordered tetrahedral structure in which Ti atoms are incorporated into the silica network [5]. Due to the advantages of silica-titania supports, they are used as supports for vanadia-containing catalysts in different applications [10][11][12][13][14][15][16][17][18]. Pure silica (denoted as Si) has a much higher surface area and pore volume compared to pure TiO 2 (denoted as Ti), 225 m 2 g −1 and 11 m 2 g −1 , respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In the same way, the current work shows that pure Ti has low acidity, which is increased after addition of silica ending up to pure SiO2 that has the highest total acidity of the tested materials. The trend of total acidity based on NH3-TPD is Si The O 1s signal showed two clear peaks for silica containing samples: a major one at ca 532.9 eV (Si-O in the SiO 2 lattice) and a minor one at ca 530.3 eV (vanadium bonded oxygen) [12]. In addition, for the Si-containing samples the deconvolution of the Si 2p spectra revealed one peak at the binding energy values between 103.60-103.86 eV (see Table 2).…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Activity Studies of Vanadia/Silica–Titania Catalysts in SVOC Partial Oxidation to Formaldehyde: Focus on the Catalyst Composition

et al. 2018

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Abstract:In this work, silica-titania supported catalysts were prepared by a sol-gel method with various compositions. Vanadia was impregnated on SiO 2 -TiO 2 with different loadings, and materials were investigated in the partial oxidation of methanol and methyl mercaptan to formaldehyde. The materials were characterized by using N 2 physisorption, X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), X-ray photoelectron spectroscopy (XPS), Scanning transmission electron microscope (STEM), NH 3 -TPD, and Raman techniques. The activity results show the high importance of an optimized SiO 2 -TiO 2 ratio to reach a high reactant conversion and formaldehyde yield. The characteristics of mixed oxides ensure a better dispersion of the active phase on the support and in this way increase the activity of the catalysts. The addition of vanadium pentoxide on the support lowered the optimal temperature of the reaction significantly. Increasing the vanadia loading from 1.5% to 2.5% did not result in higher formaldehyde concentration. Over the 1.5%V 2 O 5 /SiO 2 + 30%TiO 2 catalyst, the optimal selectivity was reached at 415 • C when the maximum formaldehyde concentration was~1000 ppm.

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“…45,46 Thus, the content fractions of anatase and rutile in the TR catalysts were calculated by the Spurr and Myers equation, 47 as shown in Table 2. The fraction of rutile phase is in the order of TR(30) (81.5%) > TR(50) (77.9%) > TR(10) (56.9%).…”

mentioning

confidence: 99%

Study of the structure and characteristics of mesoporous TiO₂ photocatalyst, and evaluation of its factors on gaseous formaldehyde removal by the analysis of ANOVA and S/N ratio

Lee

2018

RSC Adv.

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a This study differs from previous studies of TiO 2 /SiO 2 in that 0.5-10 mm microsized TiO 2 -rutile based catalysts (TR catalysts) with varying proportions of titanium and silicon were synthesized using a onestep modified hydrothermal method. At Ti/Si ¼ 1/9, a two-dimensional channel-structured catalyst with a morphology resembling that of SBA-15 was obtained. In contrast, at Ti/Si ¼ 3/7 or 5/5, a threedimensional porous structure was formed, and Ti-O-Si-C bonds appeared. The structure of the TR catalyst transformed due to the decrease in C-Si bond content and the increase in C-C bond content with increasing Ti/Si ratio. The results indicated that the rutile phase was the main crystal phase of the TR catalyst. The small crystal size and large rutile phase content of the mesoporous TR catalyst contributed to the low band gap energy below 3.0 eV. Under 2 Â 10 W lamp irradiation with either UVA or visible light, the three TR catalysts showed better formaldehyde (HCHO) removal efficiency than P25. Overall, the Pt/TR catalyst is a potential material for pollutant removal and can be easily separated from the pollutant removal system since the catalysts are microsized.

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Selective Oxidation of Ethanol to Acetaldehyde on V2O5/TiO2/SiO2Catalysts

Cited by 103 publications

References 32 publications

Kinetic study of the decomposition of 2‐butanol on carbon‐based acid catalyst

Kinetic study of the decomposition of 2‐butanol on carbon‐based acid catalyst

Catalytic Activity Studies of Vanadia/Silica–Titania Catalysts in SVOC Partial Oxidation to Formaldehyde: Focus on the Catalyst Composition

Study of the structure and characteristics of mesoporous TiO₂ photocatalyst, and evaluation of its factors on gaseous formaldehyde removal by the analysis of ANOVA and S/N ratio

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Selective Oxidation of Ethanol to Acetaldehyde on V2O5/TiO2/SiO2Catalysts

Cited by 103 publications

References 32 publications

Kinetic study of the decomposition of 2‐butanol on carbon‐based acid catalyst

Kinetic study of the decomposition of 2‐butanol on carbon‐based acid catalyst

Catalytic Activity Studies of Vanadia/Silica–Titania Catalysts in SVOC Partial Oxidation to Formaldehyde: Focus on the Catalyst Composition

Study of the structure and characteristics of mesoporous TiO2 photocatalyst, and evaluation of its factors on gaseous formaldehyde removal by the analysis of ANOVA and S/N ratio

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Study of the structure and characteristics of mesoporous TiO₂ photocatalyst, and evaluation of its factors on gaseous formaldehyde removal by the analysis of ANOVA and S/N ratio