Heterogeneously catalyzed vapor-phase oxidation of ethylene to acetaldehyde

Evnin, Anthony B.; Rabó, Jule A.; Kasai, Paul H.

doi:10.1016/0021-9517(73)90057-2

Cited by 67 publications

(33 citation statements)

References 5 publications

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“…Ten grams of LT was suspended in 1000 cm 3 water and slowly 110 cm 3 The procedure, the treatments and the conditions of vanadia introduction in the TiO 2 -LT were similar to that described above for the MT sample. The amount of vanadium, moved from the VOSO 4 solution into the TiO 2 -LT structure was about 37 % of the total IEC of the LP sample.…”

Section: Preparation Of Catalystsmentioning

confidence: 99%

“…In these systems either vanadia [3][4][5] or copper was the co-catalyst of palladium. Espeel et al [9] used Cu-Pd exchanged Y zeolites to initiate selective AcH formation in the reaction of ethylene and oxygen.…”

mentioning

confidence: 99%

“…TiO 2 ) [3][4][5][6] and carbon [7,8] were used as support. In these systems either vanadia [3][4][5] or copper was the co-catalyst of palladium.…”

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confidence: 99%

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Wacker-Oxidation of Ethylene Over Pillared Layered Material Catalysts

et al. 2014

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This paper concerns the Wacker oxidation of ethylene by oxygen in the presence of water over supported Pd/VO x catalysts. High surface area porous supports were obtained from layer-structured materials, such as, montmorillonite (MT), laponite (LT) (smectites), and hydrotalcite (layered double hydroxide, LDH) by pillaring. Before introduction of Pd, supports MT and LDH were pillared by vanadia. The laponite was used in titania-pillared form (TiO 2 -LAP) as support of Pd/VO x active component. Acetaldehyde (AcH), acetic acid (AcOH) and CO 2 were the products with yields and selectivities, depending on the reaction conditions and the properties of the applied catalyst. Under comparable conditions the pillared smectite catalysts gave higher AcH yield than the pillared LDH catalyst. UV-vis spectroscopic examination suggested that the pillared smectites contained polymeric chains of VO 4 , whereas only isolated monomeric VO 4 species were present in the pillared LDH. The higher catalytic activity in the Wacker oxidation was attributed to the more favorable redox property of the polymeric than of the monomeric vanadia. The V 3+ ions in the polymeric species can reduce O 2 to O 2-ions, whereas the obtained V 5+ ions are ready to pass over O to Pd 0 to generate PdO whereon the oxidation of the ethylene proceeds.

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Section: Preparation Of Catalystsmentioning

confidence: 99%

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confidence: 99%

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Wacker-Oxidation of Ethylene Over Pillared Layered Material Catalysts

et al. 2014

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“…Studies showed that TiO 2 supported Pd/V 2 O 5 redox system is more active in the Wacker oxidation of propylene to acetone [14] or 1-butene to butanone [17] than the corresponding SiO 2 or Al 2 O 3 supported catalysts. Evnin et al [15] ascertained that titanium acts on the V 2 O 5 phase as a ptype dopant. As such, it should lower the Fermi level of the system and create a depletion layer near to the surface, thereby, increase the electron mobility and make the whole system more "reducible".…”

Section: Introductionmentioning

confidence: 99%

“…However, in both systems the conversion and selectivity in the formation of carbonyl compounds showed fast decrease and the catalytic activity was rapidly lost. Vanadia, supported on various oxides (SiO 2 [14], Al 2 O 3 [15,16] and TiO 2 [17]) and doped with palladium showed good activity in vapour phase oxidation of alkenes. Studies showed that TiO 2 supported Pd/V 2 O 5 redox system is more active in the Wacker oxidation of propylene to acetone [14] or 1-butene to butanone [17] than the corresponding SiO 2 or Al 2 O 3 supported catalysts.…”

Section: Introductionmentioning

confidence: 99%

Structure and activity of Pd/V2O5/TiO2 catalysts in Wacker oxidation of ethylene

Barthos

Hegyessy

Novodárszki

et al. 2017

Applied Catalysis A: General

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Studies reveal that V 2 O 5 supported on TiO 2 is more active in gas phase oxidation The surface-bound vanadia forms were identified by X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and FT-Raman spectroscopy. The best activities were achieved with catalysts, having near to monolayer vanadia coverage of the support. Time-onstream catalytic tests and chemical analysis of the fresh and used catalysts proved the structural and catalytic stability of the Pd/V 2 O 5 /TiO 2 preparations. It was shown that under the conditions of Wacker-oxidation primary product acetaldehyde could become further oxidized to CO 2 , whereas no consecutive oxidation of product acetic acid proceeded.

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Wacker Chemistry with Solid Catalysts

Jacobs

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are The Overall W acker Cycle Industrial Production of Acetaldehyde via W acker Chemistry Related Chemistry Mechanistic Aspects of W acker Chemistry Heterogeneous W acker Chemistry on Zeolites Combined Pd and V as Wacker Elements in Heteropolyanion Catalysts Pd / Cu and Pd / V Couples in Solid W acker Catalysts Conclusions Acknowledgments

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Heterogeneously catalyzed vapor-phase oxidation of ethylene to acetaldehyde

Cited by 67 publications

References 5 publications

Wacker-Oxidation of Ethylene Over Pillared Layered Material Catalysts

Wacker-Oxidation of Ethylene Over Pillared Layered Material Catalysts

Structure and activity of Pd/V2O5/TiO2 catalysts in Wacker oxidation of ethylene

Wacker Chemistry with Solid Catalysts

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