Asymmetric hydrogenation in a membrane reactor: recycling of the chiral catalyst by using a retainable micellar system

Dwars, Torsten; Haberland, Jürgen; Grassert, Ingrid; Oehme, G.; Kragl, Udo

doi:10.1016/s1381-1169(00)00542-2

Cited by 55 publications

(31 citation statements)

References 11 publications

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“…21 The triblock copolymer P105 was used as a surfactant in which the rhodium catalyst was embedded. Using a UF membrane, this micellar enlarged catalyst was found to have a retention of 0.991, causing slow leaching of the catalyst.…”

Section: Polymer-enlarged Homogeneous Catalystsmentioning

confidence: 99%

The Use of Ultra- and Nanofiltration Techniques in Homogeneous Catalyst Recycling

2002

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In recent years, the application of membrane technology in homogeneous catalyst recycling has received widespread attention. This technology offers a solution for the major drawback of homogeneous catalysis, that is, recycling of the catalyst. From both an environmental and an industrial point of view, this technology is very interesting, since it allows the future application of homogeneous catalysts in the synthesis of commercial products, leading to faster, cleaner and highly selective green industrial processes. In this Account, an overview is given of the promising results obtained in the field of homogeneous catalyst recycling using nanofiltration membrane technology.

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Section: Polymer-enlarged Homogeneous Catalystsmentioning

confidence: 99%

The Use of Ultra- and Nanofiltration Techniques in Homogeneous Catalyst Recycling

2002

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“…If the K MW of the catalyst is high, recycling of the catalyst is possible. A retention of 499% for an enantioselective rhodium catalyst applied for the hydrogenation of (Z)-a-acetamidocinnamic acid methyl ester was shown by Dwars et al [8]. To develop a combined reaction and the separation process, the chosen surfactant has to support the catalytic reaction and detailed information about the MEUF step is needed.…”

Section: Introductionmentioning

confidence: 99%

Micellar enhanced ultrafiltration of a rhodium catalyst

Schwarze

Schmidt

Nguyen

et al. 2012

Journal of Membrane Science

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“…The application of micelles in catalysis is described in the scientific literature [12][13][14][15][16]. This approach [12] allows separation by ultrafiltration [13] or by pressure/temperature variation when supercritical CO 2 is used as a reaction media [14].…”

Section: Introductionmentioning

confidence: 99%

Palladium nanoparticles stabilized in block-copolymer micelles for highly selective 2-butyne-1,4-diol partial hydrogenation

Semagina

Joannet

Parra

et al. 2005

Applied Catalysis A: General

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Pd nanoparticles (2 nm) stabilized in the micelle core of poly(ethylene oxide)-block-poly-2-vinylpyridine were studied in 2-butyne-1,4-diol partial hydrogenation. Both unsupported micelles (0.6 kg Pd /m 3 ) and supported ones on g-Al 2 O 3 (0.042 wt.% Pd) showed nearly 100% selectivity to 2-butene-1,4-diol up to 94% conversion. The only side product observed was 2-butane-1,4-diol. The catalysis was ascribed to Pd nanoparticles' surface modified by pyridine units of micelles and alkali reaction medium (pH of 13.4). TOFs over the unsupported and supported catalysts were found to be 0.56 and 0.91 s À1 (at 323 K, 0.6 MPa H 2 pressure, solvent 2-propanol/water = 7:3), respectively. Reaction kinetics fit the Langmuir-Hinshelwood model assuming weak hydrogen adsorption. The experiments on the catalyst reuse showed that Pd nanoparticles remain inside the micelle core, but the micelles slightly desorbed (less then 5%) during the catalytic run. #

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Asymmetric hydrogenation in a membrane reactor: recycling of the chiral catalyst by using a retainable micellar system

Cited by 55 publications

References 11 publications

The Use of Ultra- and Nanofiltration Techniques in Homogeneous Catalyst Recycling

The Use of Ultra- and Nanofiltration Techniques in Homogeneous Catalyst Recycling

Micellar enhanced ultrafiltration of a rhodium catalyst

Palladium nanoparticles stabilized in block-copolymer micelles for highly selective 2-butyne-1,4-diol partial hydrogenation

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