Results 101 to 110 of about 35,964 (235)

In situ formation of catalytically active graphene in ethylene photo-epoxidation

Nature Communications, 2018
Ethylene epoxidation is used to produce 2 × 107 ton per year of ethylene oxide, a major feedstock for commodity chemicals and plastics. While high pressures and temperatures are required for the reaction, plasmonic photoexcitation of the Ag catalyst ...
Xueqiang Zhang, Gayatri Kumari, Jaeyoung Heo, P. Jain   +3 more
semanticscholar   +1 more source

Threading Polystyrene Stars: Impact of Star to POM‐POM and Barbwire Topology on Melt Rheological and Foaming Properties

Macromolecular Chemistry and Physics, Volume 223, Issue 24, December 2022., 2022
Defined branched polymers with an increasing number of covalently connected polystyrene stars from one to four are synthesized with a linear polyst chain using anionic polymerization and grafting‐onto procedure to investigate its influence on melt rheological properties and foaming behavior.
Marie‐Christin Röpert, Anika Goecke, Manfred Wilhelm, Valerian Hirschberg   +3 more
wiley   +1 more source

Fully Bio‐Based Epoxy Thermoset Based on Epoxidized Linseed Oil and Tannic Acid

Macromolecular Materials and Engineering, Volume 307, Issue 12, December 2022., 2022
By using epoxidized linseed oil and tannic acid to produce a bio‐based thermoset, this work pursues the approach of replacing hazardous and petrochemical‐derived materials with nontoxic bio‐based materials while preserving the efficacy of function. Thus, good thermal‐ and mechanical properties such as a flexural modulus of 2986 MPa, Tg of 147 °C, or ...
Nikita Reinhardt, Jonas M. Breitsameter, Klaus Drechsler, Bernhard Rieger   +3 more
wiley   +1 more source

Computationally Designed Zirconium Organometallic Catalyst for Direct Epoxidation of Alkenes without Allylic H Atoms: Aromatic Linkage Eliminates Formation of Inert Octahedral Complexes [PDF]

arXiv, 2015
We used density functional theory to computationally design a Zr organometallic catalyst for selectively oxidizing substrates using molecular oxygen as oxidant without coreductant. Each selective oxidation cycle involves four general steps: (a) a peroxo or weakly adsorbed O2 group releases an O atom to substrate to form substrate oxide and an oxo group,
arxiv  

Valorization of CNSL as a Sustainable Solution for PVC Plasticization: A Comprehensive Study of Cardanol–Cardol Mixture

Journal of the American Oil Chemists' Society, EarlyView.
ABSTRACT For the first time, a mixture of cardanol and cardol esters has been studied as plasticizers for PVC. From our previous work, it has been established that the favorable plasticizing properties of cardol for PVC materials exist. Hence, the utilization of cashew nutshell liquid (CNSL), a naturally occurring mixture of cardanol and cardol, as a ...
Adélaïde Gartili, Vincent Lapinte, Benoit Briou, Sylvain Caillol   +3 more
wiley   +1 more source

Use of Whole Cells and Cell‐Free Extracts of Catalase‐Deficient E. coli for Peroxygenase‐Catalyzed Reactions

Biotechnology and Bioengineering, EarlyView.
ABSTRACT Unspecific peroxygenases (UPOs) and cytochrome P450 monooxygenases (CYPs) with peroxygenase activity are becoming the preferred biocatalysts for oxyfunctionalization reactions. While whole cells (WCs) or cell‐free extracts (CFEs) of Escherichia coli are often preferred for cofactor‐dependent monooxygenase reactions, hydrogen peroxide (H2O2 ...
Ana C. Ebrecht, U. Joost Luelf, Kamini Govender, Diederik J. Opperman, Vlada B. Urlacher, Martha S. Smit   +5 more
wiley   +1 more source

Biosynthesis of sulfonated carbon catalyst from carbohydrate polymer derivatives for epoxidation of Croton macrostachyus seed oil

Carbohydrate Polymer Technologies and Applications, 2022
In the present study, biosynthesis of sulfonated carbon acid catalyst from brewery spent grain through carbonation process followed by sulphonation method used for production of epoxy oil from Croton macrostachyus seed oil in presence of acetic acid as ...
Tafere Aga Bullo, Yigezu Mekonnen Bayisa, Mohammed Seid Bultum   +2 more
doaj  

Identification of key active site positions controlling the chemoselectivity of Aspergillus brasiliensis unspecific peroxygenase

ChemBioChem, Accepted Article.
Heme‐containing unspecific peroxygenases (UPOs) have catched significant attention as biocatalysts for oxidation reactions due to their ability to function without expensive nicotinamide cofactors. In our recent study, the UPO from Aspergillus brasiliensis (AbrUPO) was found to catalyze the aromatic hydroxylation of substituted benzenes, a feature that
Fabian Schmitz, Maike Hoffrogge, Katja Koschorreck, Yasuhisa Fukuta, Alessandra Raffaele, Florian Tieves, Thomas Hilberath, Frank Hollmann, Vlada B. Urlacher   +8 more
wiley   +1 more source

Greener extraction‐chemical modification‐polymerization pipeline of vernolic acid from Ethiopian ironweed plant

Journal of Polymer Science, Volume 60, Issue 24, Page 3354-3365, 15 December 2022., 2022
Abstract Epoxidized oils are commonly used in the plastics industry as additives in the formulation of polyvinyl chloride (PVC) and as monomers in the coating industry. They are produced from petrochemical feedstocks or by chemical epoxidation of natural oils. Currently, the synthesis processes of these materials are expensive, utilize volatile organic
Mariana d'Almeida Gameiro, Philippa L. Jacob, Kristoffer Kortsen, Thomas Ward, Vincenzo Taresco, Robert A. Stockman, Yonas Chebude, Steven M. Howdle   +7 more
wiley   +1 more source

Review and perspectives on TS-1 catalyzed propylene epoxidation

iScience
Summary: Titanium silicate zeolite (TS-1) is widely used in the research on selective oxidations of organic substrates by H2O2. Compared with the chlorohydrin process and the hydroperoxidation process, the TS-1 catalyzed hydroperoxide epoxidation of ...
Jimei Yang, Shuling Liu, Yanyan Liu, Limin Zhou, Hao Wen, Huijuan Wei, Ruofan Shen, Xianli Wu, Jianchun Jiang, Baojun Li   +9 more
doaj