Layered double hydroxides supported nano palladium: An efficient catalyst for the chemoselective hydrogenation of olefinic bonds

M, Lakshmi Kantam; Parsharamulu, Thupakula; Manorama, Sunkara V.

doi:10.1016/j.molcata.2012.08.017

Cited by 28 publications

(3 citation statements)

References 33 publications

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“…The layered double hydroxide-supported nanopalladium (LDH-Pd0) catalyst was reported for producing a mixture of products with a low selectivity for 3-ethyl-1-nitrobenzene. 35 Pd nanoparticles supported on fibrous silica nanospheres KCC-1-NH 2 could be used for the transfer hydrogenation of alkene with the use of HCOOH as a source of hydrogen. 36 However, this catalyst reduced both functionalities of 3-nitrostyrene with 45% conversion yield to 3-ethylaniline.…”

Section: Resultsmentioning

confidence: 99%

Colloidal Palladium Nanoparticles for Selective Hydrogenation of Styrene Derivatives with Reactive Functional Groups

et al. 2019

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This article presents the catalysis investigation of octanethiolate-capped palladium nanoparticles (C8 PdNP) and phenylethanethiolate-capped palladium nanoparticles (PhC2 PdNP) for chemoselective catalytic hydrogenation reactions of styrene derivatives in the presence of other reducible functionalities. The results show that the C8 PdNP is highly active under mild reaction conditions (room temperature and atmospheric pressure) and selective for hydrogenating monosubstituted alkene groups without reducing other reactive functional groups such as nitro, halo, carbonyls, and so forth. In comparison, the noncovalent interactions between surface phenyl ligands and aromatic substrates are found to hinder the hydrogenation activity of PhC2 PdNP.

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Section: Resultsmentioning

confidence: 99%

Colloidal Palladium Nanoparticles for Selective Hydrogenation of Styrene Derivatives with Reactive Functional Groups

et al. 2019

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“…Palladium nanoparticles have high surface-to-volume ratio which makes them widely used as catalyst in the hydrogenation reaction . This work focused on the exploration of (Pd-ligand) 10 film catalysts on the hydrogenation of nitroarenes bearing different steric and electronic moieties.…”

Section: Resultsmentioning

confidence: 99%

Layer-by-Layer Self-Assembly of Pd Films and Their Catalytic Properties toward Nitroarenes Hydrogenation

Yang

Zhao

Gao

2017

Ind. Eng. Chem. Res.

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Metal–organic films onto the solid surface have been successfully assembled through Layer-by-Layer (LbL) deposition methods. The organic ligand isonicotinic acid (3-pyridylmethylene) hydrazide containing pyridine groups was chosen to act as a useful building unit, and K2PdCl4 was used as the precursor for the films preparation. UV–vis spectra, transmission electron microscopy (TEM), atomic force microscopy (AFM), and inductively coupled plasma optical emission spectrometry (ICP-OES) were applied to understand the growth process of the resulting LbL multilayers. The LbL films with 10 layers (denoted as (Pd-ligand)10) were further applied as catalysts for the hydrogenation of nitroarenes. It is worth mentioning that our films catalyst is convenient to recycle and possesses good reusability.

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“…9−14 For example, in the work of Onyestyak and co-workers, 12 Pd nanoparticles supported on hydrotalcite were prepared through the impregnation method and reduced with H 2 at 623 K. However, this approach often suffers from aggregation and an inhomogeneity in the distribution of metallic nanoparticles, and difficulties in removing of surfactants as well, leading to loss of monodispersity and catalytic activity. Alternatively, chemical reduction agents, for instance, borohydride, 15−17 hydrazine hydrate, 18,19 hexamethylenetetramine, 20,21 soluble starch, 22 and cyclohexene, were also involved in the synthesis process. 23 Accordingly, other chemical reagents, such as NaOH, was necessary or the temperature was higher than 353 K. For example, as reported by He, 16 Pd 2+ ions supported on Mg 2 Al–LDH were reduced by NaBH 4 as follows: first, NaOH was added into the aqueous solution containing LDH until the pH value reached 10; second, Na 2 PdCl 4 was added, and the pH value of the solution was kept at 10 by adding more NaOH; third, NaBH 4 was added starting the reduction.…”

Section: Introductionmentioning

confidence: 99%

Monodispersed Pd Nanoparticles Supported on Mg–Al Mixed Metal Oxides: A Green and Controllable Synthesis

Zhu

Shen

et al. 2016

ACS Omega

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Aimed at the green synthesis of supported noble metal nanoparticles without any additional reducing agents or stabilizers at room temperature, a new strategy in which monodispersed Pd nanoparticles were successfully immobilized on Mg–Al mixed metal oxides derived from layered double hydroxides was developed, and the reduction mechanism was also proposed. It allowed the in situ immobilization of monodispersed Pd nanoparticles with a face-centered cubic structure, using only alcohols with α-hydrogen atom as the solvent and reducing agent. Control over the mean particle size and content of Pd nanoparticles was realized by adjusting the temperature, initial concentration, and type of alcohol. With the content of Pd varied from 6.4 to 42.3 mg/g, the mean particle size of Pd increased from 1.1 to 4.9 nm. The as-prepared catalyst showed high catalytic activity for oxidation of benzyl alcohol: when the Pd content was 6.4 mg/g, conversion of 60.3% and selectivity of 99.2% were obtained with a turnover frequency of 4807 h –1 . Similarly, on the basis of the high stand electrode potentials, immobilized Ag (5.6 nm) and Au (4.7 nm) nanoparticles were also prepared through this methodology. Moreover, the choice of supports was extended to other powder supports that would react with the byproduced acid. Overall, this facile method opens up new opportunities for controllable synthesis of supported nanoparticle catalysts in a green way.

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Layered double hydroxides supported nano palladium: An efficient catalyst for the chemoselective hydrogenation of olefinic bonds

Cited by 28 publications

References 33 publications

Colloidal Palladium Nanoparticles for Selective Hydrogenation of Styrene Derivatives with Reactive Functional Groups

Colloidal Palladium Nanoparticles for Selective Hydrogenation of Styrene Derivatives with Reactive Functional Groups

Layer-by-Layer Self-Assembly of Pd Films and Their Catalytic Properties toward Nitroarenes Hydrogenation

Monodispersed Pd Nanoparticles Supported on Mg–Al Mixed Metal Oxides: A Green and Controllable Synthesis

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