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You searched for: Subject term epoxides Remove constraint Subject term: epoxides Subject term emulsions Remove constraint Subject term: emulsions Subject term catalytic activity Remove constraint Subject term: catalytic activity
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1. 110th Anniversary: The Epoxidation of Polybutadiene via Reaction-Controlled Phase-Transfer Catalysis

Author:
Li Xu; Bo-Geng Li; Suyun Jie; Zhisong Li; Zhiyang Bu
Source:
Industrial & engineering chemistry process design and development 2019 v.58 no.29 pp. 13085-13092
ISSN:
1520-5045
Subject:
catalysts; catalytic activity; emulsions; energy; epoxidation reactions; epoxides; hydrogen peroxide; polymerization; process design; rubber
Abstract:
... By using an aqueous H₂O₂ solution and the reaction-controlled phase-transfer catalyst CPC-PW₄O₁₆, polybutadiene (PBD) was epoxidized quantitatively and efficiently up to an epoxy ratio of 20 mol %. During the epoxidation, the catalyst first interacted with H₂O₂ to generate an amphiphilic intermediate, which made the reaction mixture become a two-phase emulsion. The epoxidation of PBD occurred in t ...
DOI:
10.1021/acs.iecr.9b02371

2. Covalent immobilization of Kluyveromyces fragilis β-galactosidase on magnetic nanosized epoxy support for synthesis of galacto-oligosaccharide

Author:
Hong Liu; Jianfu Liu; Bin Tan; Fenjuan Zhou; Yan Qin; Ruijin Yang
Source:
Bioprocess and biosystems engineering 2012 v.35 no.8 pp. 1287-1295
ISSN:
1615-7591
Subject:
Kluyveromyces marxianus; beta-galactosidase; biocatalysts; bioprocessing; catalytic activity; composite polymers; emulsifiers; emulsions; engineering; epoxides; esters; galactooligosaccharides; immobilized enzymes; magnetic properties; magnetism; nanocomposites; nanoparticles; polymerization; scanning electron microscopy; surfaces
Abstract:
... The novel magnetic nanobeads with epoxy groups on the surface were prepared from glycidyl methacrylate (GMA), ethylene glycol dimethacrylate (EGDMA) and hydroxyethyl methacrylate (HEMA) via emulsifier-free emulsion polymerisation, and they were characterized by scanning electron microscopy and vibrating sample magnetometer. The magnetic poly(GMA–EDGMA–HEMA) nanobeads were used as support for coval ...
DOI:
10.1007/s00449-012-0716-2

3. Hierarchical porous metallized poly-melamine-formaldehyde (PMF) as a low-cost and high-efficiency catalyst for cyclic carbonate synthesis from CO₂ and epoxides

Author:
Jian Yin; Tianqi Zhang; Emily Schulman; Dongxia Liu; Jianqiang Meng
Source:
Journal of materials chemistry 2018 v.6 no.18 pp. 8441-8448
ISSN:
2050-7496
Subject:
active sites; adsorption; batteries; carbon cycle; carbon dioxide; carbonates; catalysts; catalytic activity; coal; cost effectiveness; emulsions; epoxides; greenhouse gas emissions; mass transfer; natural gas; petroleum; plastics; polymerization; propylene; raw materials; solvents; triazines
Abstract:
... The deployment of fossil resources such as petroleum, coal and natural gas to produce fuels and chemicals has resulted in excessive carbon dioxide (CO₂) emissions and serious environmental issues. The implementation of CO₂ utilization as a raw material for synthesis of fuels and chemicals has potential to reduce CO₂ emissions and close the carbon cycle. Cyclic carbonates, materials used as buildin ...
DOI:
10.1039/c8ta00625c

4. Immobilized feruloyl esterase from Humicola insolens catalyzes the synthesis of feruloylated oligosaccharides

Author:
Juan Tamayo-Cabezas; Salwa Karboune
Source:
Process biochemistry 2019 v.79 pp. 81-90
ISSN:
1359-5113
Subject:
Humicola insolens; acylation; catalytic activity; emulsions; epoxides; ferulic acid; feruloyl esterase; magnetism; microparticles; nanoparticles; raffinose; substrate specificity
Abstract:
... Ferulic acid acylation of oligosaccharides catalyzed by feruloyl esterases (FAE) is a promising route to produce feruloylated oligosaccharides. However, modulation of FAE synthetic properties is a key step to improve the acylation. The efficiency of H. insolens FAE to catalyze the feruloylation in six different surfactantless microemulsions reaction systems was evaluated. The highest yield (57%) w ...
DOI:
10.1016/j.procbio.2018.12.013

5. Magnetic thermosensitive polymer composite carrier with target spacing for enhancing immobilized enzyme performance

Author:
Hongyi Tu; Boyuan Zhang; Xiayun Zhang; Chunli Zhao; Lin Li; Jianbin Wang; Zhenbin Chen; Pingbo Wang; Zhizhong Li
Source:
Enzyme and microbial technology 2021 v.150 pp. 109896
ISSN:
0141-0229
Subject:
acrylamides; catalytic activity; composite polymers; emulsions; enzyme activity; epoxides; immobilized enzymes; magnetic separation; magnetism; penicillin amidase; polymerization; silane; temperature; thermosensitivity
Abstract:
... A novel magnetic thermosensitive polymer composite carrier with target spacing was developed. In this strategy, thermosensitive polymer grafted on magnetic Fe₃O₄ for enhancing immobilized penicillin G acylase (PGA) performance and introduce immobilized target spacing into magnetic carriers for the first time. Fe₃O₄ nanoparticles were synthesized by a reverse microemulsion method. The modifier used ...
DOI:
10.1016/j.enzmictec.2021.109896

6. Pickering Emulsion-Derived Liquid–Solid Hybrid Catalyst for Bridging Homogeneous and Heterogeneous Catalysis

Author:
Xiaoming Zhang; Yiting Hou; Rammile Ettelaie; Ruqun Guan; Ming Zhang; Yabin Zhang; Hengquan Yang
Source:
Journal of the American Chemical Society 2019 v.141 no.13 pp. 5220-5230
ISSN:
1520-5126
Subject:
catalysts; catalytic activity; droplets; emulsions; enantioselectivity; engineering; enzymes; epoxides; ionic liquids; liquids; palladium; silica
Abstract:
... We describe a novel method to prepare a liquid–solid hybrid catalyst via interfacial growth of a porous silica crust around Pickering emulsion droplets, which allowed us to overcome the current limitations of both homogeneous and heterogeneous catalysts. The inner micron-scaled liquid (for example, ionic liquids) pool of the resultant catalyst can host free homogeneous molecular catalysts or enzym ...
DOI:
10.1021/jacs.8b11860

7. Polyoxometalate-catalysed epoxidation of 1-octene with hydrogen peroxide in microemulsions coupled with ultrafiltration

Author:
Arnold Lambert; Pawel Plucinski; Ivan V. Kozhevnikov
Source:
Chemical communications 2003 v. no.6 pp. 714-715
ISSN:
1364-548X
Subject:
catalytic activity; emulsions; epoxidation reactions; epoxides; hydrogen peroxide; salts; ultrafiltration
Abstract:
... Epoxidation of 1-octene with hydrogen peroxide catalysed by amphiphilic salts of peroxo tungstophosphate {PO₄[WO(O₂)₂]₄}³⁻ in water-in-oil microemulsions is an efficient and environmentally benign reaction which, coupled with ultrafiltration, shows the potential for continuous production of epoxides. ...
DOI:
10.1039/b300494p