2014
DOI: 10.1007/s10562-014-1198-4
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Wacker-Oxidation of Ethylene Over Pillared Layered Material Catalysts

Abstract: 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)… Show more

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Cited by 9 publications
(4 citation statements)
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“…45 TPR experiments revealed that the reduction of the PdO phase typically occurs already below room temperature. 46,47 Lin et al, for instance, observed a reduction peak for their palladiumbased catalyst on Al 2 O 3 at 20 °C, 48 whereas Pd reduction on TiO 2 -supported catalysts took place already at around 0 °C. 49 However, van der Heide et al 50 observed reduction of the V 2 O 5 phase for their palladium-based catalyst originating from spillover of chemisorbed hydrogen from the palladium surface, resulting in a monolayer of hydrogen bronze of vanadium.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…45 TPR experiments revealed that the reduction of the PdO phase typically occurs already below room temperature. 46,47 Lin et al, for instance, observed a reduction peak for their palladiumbased catalyst on Al 2 O 3 at 20 °C, 48 whereas Pd reduction on TiO 2 -supported catalysts took place already at around 0 °C. 49 However, van der Heide et al 50 observed reduction of the V 2 O 5 phase for their palladium-based catalyst originating from spillover of chemisorbed hydrogen from the palladium surface, resulting in a monolayer of hydrogen bronze of vanadium.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…As basic catalyst MgO-Al 2 O 3 mixed oxide, produced from Mg,Al-Layered Double Hydroxyde (LDH) by calcining at 550 °C for 5 h, was used. The synthesis of Mg,Al-LDH is reported elsewhere [28].The characteristics of the catalysts are summarized in Table 1.…”
Section: Methodsmentioning
confidence: 99%
“…The cellulose, hemicellulose, and the lignin content of the biomass samples analyzed by the modified method of Sluiter et al[27,28 ] …”
mentioning
confidence: 99%
“…Even though supported Pd catalysts over SiO 2 , 6 ZrO 2 , 7 Al 2 O 3 , 8 TiO 2 , 9 hydrotalcites 10,11 or zeolite, 12,13 offer an easier product separation, the reduction of Pd 2+ species during the reaction and leaching of the active species in the solution remains unsolved due to a poor metal-support interaction. Alternatively, grafting the supports with an "anchoring ligand" to accommodate the Pd 2+ active species can minimize leaching of the Pd 2+ complex and reduction of Pd 2+ to Pd black.…”
Section: Introductionmentioning
confidence: 99%