Catalytic Oxidations in Dense Carbon Dioxide

Seki, Tsunetake; Baiker, Alfons

doi:10.1021/cr8004058

Cited by 96 publications

(51 citation statements)

References 142 publications

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“…range of polar and apolar molecules, including dioxygen, and simple and efficient recyclability. The use of scCO 2 has been recently reviewed by Seki and Baiker [121]; hence, we only highlight selectively from this field. There are several reports related to Pd-nanoparticle-catalyzed alcohol selox in scCO 2 [122][123][124].…”

Section: Solvent Selectionmentioning

confidence: 99%

Mechanistic Studies of Alcohol Selective Oxidation

Lee

2013

Heterogeneous Catalysts for Clean Technology

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IntroductionCatalytic selective oxidation (selox) is an important class of clean chemical transformations employed in the synthesis of valuable chemical intermediates, and a test bed for many fundamental concepts within heterogeneous catalysis and surface science. The selox of alcohols, carbohydrates, and aromatics is especially challenging in terms of understanding the dynamics of chemical reactions at the liquid-solid-gas interface, and requires new spectroscopic tools and analytical protocols to provide quantitative spatiotemporal information on structure-function relationships in order to optimize reaction conditions and design next-generation selox catalysts. Advances in inorganic methodologies to synthesize tunable nanostructures, and synchrotron science and the parallel development of multidimensional spectroscopies, afford new possibilities for understanding the operation of catalysts under working conditions (operando), and thereby nanoengineering the active site for improved activity, selective, and lifetime in selox chemistry. Applications of Selective OxidationThe oxidative dehydrogenation of alcohols represents key steps in the synthesis of aldehyde, ketone, ester, and acid intermediates employed within the fine chemical, pharmaceutical, and agrochemical sectors, with allylic aldehydes in particular high-value components used in the perfume and flavoring industries [1]. For example, crotonaldehyde is an important agrochemical and a valuable precursor for the food preservative sorbic acid, while citronellyl acetate and cinnamaldehyde confer rose/fruity and cinnamon flavors and aromas, respectively. There is also considerable interest in the exploitation of biomass-derived feedstocks such as glycerol (a by-product of biodiesel synthesis from plant or Heterogeneous Catalysts for Clean Technology: Spectroscopy, Design, and Monitoring, First Edition. Edited

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Section: Solvent Selectionmentioning

confidence: 99%

Mechanistic Studies of Alcohol Selective Oxidation

Lee

2013

Heterogeneous Catalysts for Clean Technology

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“…The use of scCO2 has recently been reviewed by Seki and Baiker, 95 hence we only highlight selections from this field. There are several reports of Pd nanoparticle catalysed alcohol selox in scCO 2 .…”

Section: Supercritical Fluidsmentioning

confidence: 99%

Recent advances in the heterogeneously catalysed aerobic selective oxidation of alcohols

Vinod

Wilson

Lee

2010

J. Chem. Technol. Biotechnol.

169

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The heterogeneously catalysed selective aerobic oxidation of alcohols is an important tool for the synthesis of valuable chemical intermediates and a hot topic within both academic and industrial arenas. In this mini-review, selected aspects of catalyst formulation, process operating conditions, and progress in identifying the active sites and surface reaction mechanisms notably through the application of synchrotron radiation, are highlighted.

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“…For more information concerning the catalytic oxidation step the reader is referred to specialized literature (Seki, 2009, Evonik Industries, 2011. Including some extra space inside the vessel to prevent gas build up at any time, the dimensions of the oxidation vessel have been estimated at 0.1 m in diameter and 1 m height.…”

Section: Oxidation Vesselmentioning

confidence: 99%

Residual Monomer Reduction in Polymer Latex Products by Extraction with Supercritical Carbon Dioxide

Aerts

Meuldijk

Kemmere

et al. 2011

Macromolecular Symposia

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Summary: Extraction of residual monomer from a latex product with supercritical carbon dioxide ((sc)CO2) in a column was studied. Operating conditions were chosen at 35 °C and 100 bar. For reducing the residual styrene level in a polystyrene latex from 104 ppm to 100 ppm and from 104 ppm to 10 ppm, a countercurrent bubble column with latex as continuous and (sc)CO2 as dispersed phase is suggested. Monomer partitioning was demonstrated to be a key parameter in the equipment design. Monomer transport was found to be governed by the shuttle effect, caused by Brownian motion of the latex to and from the H2O/CO2 interface. The drift‐flux approach was followed to determine the column flooding conditions. Small column volumes are obtained. (sc)CO2 is a promising extraction medium for residual monomer reduction in latex products. Performance towards steam stripping is better as the final residual monomer level becomes lower.

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Catalytic Oxidations in Dense Carbon Dioxide

Cited by 96 publications

References 142 publications

Mechanistic Studies of Alcohol Selective Oxidation

Mechanistic Studies of Alcohol Selective Oxidation

Recent advances in the heterogeneously catalysed aerobic selective oxidation of alcohols

Residual Monomer Reduction in Polymer Latex Products by Extraction with Supercritical Carbon Dioxide

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