One-Step Synthesis of Acetals from Phenol/Alcohols Mixtures Using a Pd/Aluminoborate Catalyst

Guan, Yejun; Zhang, Damin; Wang, Yimeng

doi:10.1007/s10562-012-0891-4

Cited by 9 publications

(6 citation statements)

References 32 publications

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“…103 Their group also investigated the performance of an aluminoborate (ABO-X, 9Al 2 O 3 •2B 2 O 3 and PKU-1) supported palladium catalyst and observed that Pd/ABO-X exhibits a superior performance, owing to the high BO 4 /BO 3 ratio of ABO-X. 106 In addition, they investigated the solvent effect and observed that phenol conversion drops remarkably in ethanol. They ascribed this to the competitive adsorption of solvents and reactants (phenol/H 2 ) on the same active site, which is in line with the observations of Velu et al 77 Currently, there is considerable interest in the role of polymers as supports or stabilizers.…”

Section: Aqueous Mediamentioning

confidence: 99%

Selective hydrogenation of phenol and related derivatives

Zhong

Chen

2014

Catal. Sci. Technol.

116

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Section: Aqueous Mediamentioning

confidence: 99%

Selective hydrogenation of phenol and related derivatives

Zhong

Chen

2014

Catal. Sci. Technol.

116

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“…We are particularly interested with aluminoborates because B and Al probably can serve as Lewis acid sites. Indeed, PKU-1 was recently proved to be a solid acid catalyst showing an activity to phenol hydrogenation with Pd-loading . PKU-2 (Al 2 B 5 O 9 (OH) 3 · n H 2 O), which possesses 24-membered structural channels, shows an excellent catalytic activity to the cyanosilylation reaction of aldehydes under mild conditions .…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, PKU-1 was recently proved to be a solid acid catalyst showing an activity to phenol hydrogenation with Pd-loading. 16 PKU-2 (Al 2 B 5 O 9 (OH) 3 •nH 2 O), which possesses 24-membered structural channels, shows an excellent catalytic activity to the cyanosilylation reaction of aldehydes under mild conditions. 8 A preliminary redox catalytic study was performed on Crsubstituted PKU-1, where Cr 3+ was proved to be the active centers by the selective oxidation of styrene under mild reaction conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

Systematic Study of Cr³⁺ Substitution into Octahedra-Based Microporous Aluminoborates

Lin

Zhou

et al. 2014

Inorg. Chem.

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Single crystals of pure aluminoborate PKU-1 (Al3B6O11(OH)5·nH2O) were obtained, and the structure was redetermined by X-ray diffraction. There are three independent Al atoms in the R3 structure model, and Al3 locates in a quite distorted octahedral environment, which was evidenced by (27)Al NMR results. This distortion of Al3O6 octahedra release the strong static stress of the main framework and leads to a symmetry lowering from the previously reported R3 to the presently reported R3. We applied a pretreatment to prepare Al(3+)/Cr(3+) aqueous solutions; as a consecquence, a very high Cr(3+)-to-Al(3+) substitution content (∼50 atom %) in PKU-1 can be achieved, which is far more than enough for catalytic purposes. Additionally, the preference for Cr(3+) substitution at the Al1 and Al2 sites was observed in the Rietveld refinements of the powder X-ray data of PKU-1:0.32Cr(3+). We also systematically investigated the thermal behaviors of PKU-1:xCr(3+) (0 ≤ x ≤ 0.50) by thermogravimetric-differential scanning calorimetry, in situ high-temperature XRD in vacuum, and postannealing experiments in furnace. The main framework of Cr(3+)-substituted PKU-1 could be partially retained at 1100 °C in vacuum. When 0.04 ≤ x ≤ 0.20, PKU-1:xCr(3+) transferred to the PKU-5:xCr(3+) (Al4B6O15:xCr(3+)) structure at ∼750 °C by a 5 h annealing in air. Further elevating the temperature led to a decomposition into the mullite phase, Al4B2O9:xCr(3+). For x > 0.20 in PKU-1:xCr(3+), the heat treatment led to a composite of Cr(3+)-substituted PKU-5 and Cr2O3, so the doping upper limit of Cr(3+) in PKU-5 structure is around 20 atom %.

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“…10−19 When weakly interacted species such as H 3 BO 3 , H 2 O are involved in the channels, the obtained aluminoborates are stable after calcination and can be used as catalysts in different reactions. 13,16,20 Unfortunately, aluminoborates synthesized with weakly interacted guest species normally crystallized in small sizes, and most of their structures were difficult to be elucidated by single crystal X-ray diffraction (SC-XRD). 16 17,18,21,22 One typical example is PKU-3 in this work, which was synthesized more than 10 years ago without a structure model.…”

mentioning

confidence: 99%

“…and weakly interacted SDAs (boric acid, water etc.) can be employed in the synthesis. − When weakly interacted species such as H 3 BO 3 , H 2 O are involved in the channels, the obtained aluminoborates are stable after calcination and can be used as catalysts in different reactions. ,, …”

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confidence: 99%

PKU-3: An HCl-Inclusive Aluminoborate for Strecker Reaction Solved by Combining RED and PXRD

Chen

Meng

et al. 2015

J. Am. Chem. Soc.

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A novel microporous aluminoborate, denoted as PKU-3, was prepared by the boric acid flux method. The structure of PKU-3 was determined by combining the rotation electron diffraction and synchrotron powder X-ray diffraction data with well resolved ordered Cl(-) ions in the channel. Composition and crystal structure analysis showed that there are both proton and chlorine ions in the channels. Part of these protons and chlorine ions can be washed away by basic solutions to activate the open pores. The washed PKU-3 can be used as an efficient catalyst in the Strecker reaction with yields higher than 90%.

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One-Step Synthesis of Acetals from Phenol/Alcohols Mixtures Using a Pd/Aluminoborate Catalyst

Cited by 9 publications

References 32 publications

Selective hydrogenation of phenol and related derivatives

Selective hydrogenation of phenol and related derivatives

Systematic Study of Cr³⁺ Substitution into Octahedra-Based Microporous Aluminoborates

PKU-3: An HCl-Inclusive Aluminoborate for Strecker Reaction Solved by Combining RED and PXRD

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One-Step Synthesis of Acetals from Phenol/Alcohols Mixtures Using a Pd/Aluminoborate Catalyst

Cited by 9 publications

References 32 publications

Selective hydrogenation of phenol and related derivatives

Selective hydrogenation of phenol and related derivatives

Systematic Study of Cr3+ Substitution into Octahedra-Based Microporous Aluminoborates

PKU-3: An HCl-Inclusive Aluminoborate for Strecker Reaction Solved by Combining RED and PXRD

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Systematic Study of Cr³⁺ Substitution into Octahedra-Based Microporous Aluminoborates