Functionalized Poly(ethylene glycol)-Stabilized Palladium Nanoparticles as an Efficient Catalyst for Aerobic Oxidation of Alcohols in Supercritical Carbon Dioxide/Poly(ethylene glycol) Biphasic Solvent System

2014

Appl Petrochem Res

Concerns over the economics of proven fossil fuel reserves, in concert with government and public acceptance of the anthropogenic origin of rising CO 2 emissions and associated climate change from such combustible carbon, are driving academic and commercial research into new sustainable routes to fuel and chemicals. The quest for such sustainable resources to meet the demands of a rapidly rising global population represents one of this century's grand challenges. Here, we discuss catalytic solutions to the clean synthesis of biodiesel, the most readily implemented and low cost, alternative source of transportation fuels, and oxygenated organic molecules for the manufacture of fine and speciality chemicals to meet future societal demands.

Section: Palladium Catalysed Aerobic Alcohol Seloxmentioning

confidence: 99%

Catalysing sustainable fuel and chemical synthesis

2014

Appl Petrochem Res

“…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]. Biphasic aerobic oxidation of 3-methyl-2-butene-1-ol (and a range of allylic and benzylic alcohols) over Pd/PEG was recently found to be very efficient under continuousflow operation [125] (Figure 2.8).…”

Section: Solvent Selectionmentioning

confidence: 99%

Mechanistic Studies of Alcohol Selective Oxidation

Heterogeneous Catalysts for Clean Technology

2013

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

Recent advances in the heterogeneously catalysed aerobic selective oxidation of alcohols

Vinod

Wilson

J. Chem. Technol. Biotechnol.

2010

169

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.