scholarly journals Oxidation Activity of MoO3-P2O5-XnOm Ternary Catalyst System

1973 ◽  
Vol 15 (1) ◽  
pp. 18-22 ◽  
Author(s):  
Mamoru Ai ◽  
Sadao Suzuki
Keyword(s):  
Catalyst System ◽  
Oxidation Activity ◽  
Ternary Catalyst

Synthesis of Liquid Polyisoprene with High cis-1,4 Unit Content and Narrow Molecular Weight Distribution Using Neodymium Phosphate Catalyst

2019 ◽  
Vol 72 (6) ◽  
pp. 467 ◽  
Author(s):  
Jie Liu ◽  
Xin Min ◽  
Xiuzhong Zhu ◽  
Zichao Wang ◽  
Tong Wang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Catalyst System ◽  
Size Exclusion ◽  
Narrow Molecular Weight Distribution ◽  
13C Nmr Analysis ◽  
Exclusion Chromatography ◽  
Ft Ir ◽  
Ternary Catalyst

The polymerization of isoprene (Ip) initiated by a ternary catalytic system consisting of liquid Nd(P204)3 (Nd), Al(i-Bu)2H (Al), and CHCl3 (Cl) in cyclohexane was examined. The effects of order of addition and amount of Ip, Al, and Cl in the catalyst on the polymerization were evaluated. The molecular weight (Mn), molecular weight distribution (Mw/Mn), and microstructure of the polymer were characterized using size exclusion chromatography and multiangle light scattering, FT-IR, 1H NMR and 13C NMR analysis. The results indicate that the order of addition, i.e. Nd+Ip+Al+Cl and ratios of [Ip]/[Nd]=30, [Al]/[Nd]=20, and [Cl]/[Nd]=3 were essential for the optimized ternary catalyst system Nd(P204)3/Al(i-Bu)2H/CHCl3. The resulting liquid polyisoprene (LIR) has a high cis-1,4 unit content (>98%) and a narrow molecular weight distribution (Mw/Mn<1.2). The molecular weight of the polymer was precisely controlled.

Copolymerization of lactide, epoxides and carbon dioxide: a highly efficient heterogeneous ternary catalyst system

2021 ◽  
Vol 12 (11) ◽  
pp. 1700-1706
Author(s):  
Xiang Li ◽  
Ran-long Duan ◽  
Chen-yang Hu ◽  
Xuan Pang ◽  
Ming-xiao Deng
Keyword(s):  
Carbon Dioxide ◽  
Catalyst System ◽  
Polymer Chains ◽  
Polymer Chemistry ◽  
Highly Efficient ◽  
System P ◽  
Ternary Catalyst

The controlled copolymerization of mixed monomers that usually imparts distinct advantages into single polymer chains and requires a single versatile catalyst remains a key challenge in polymer chemistry.

One-pot copolymerization of epoxides/carbon dioxide and lactide using a ternary catalyst system

2018 ◽  
Vol 8 (24) ◽  
pp. 6452-6457 ◽  
Author(s):  
Xiang Li ◽  
Chenyang Hu ◽  
Xuan Pang ◽  
Ranlong Duan ◽  
Xuesi Chen
Keyword(s):  
Carbon Dioxide ◽  
Catalytic System ◽  
Chain Transfer ◽  
Catalyst System ◽  
Transfer Mechanism ◽  
One Pot ◽  
Multiblock Copolymer ◽  
System P ◽  
Ternary Catalyst

A PLA/PPC multiblock copolymer was prepared using a novel ternary catalytic system that proceeds via an intermolecular chain transfer mechanism.

scholarly journals Adsorption Followed by Plasma Assisted Catalytic Conversion of Toluene into CO2 on Hopcalite in an Air Stream

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 845
Author(s):  
Shilpa Sonar ◽  
Jean-Marc Giraudon ◽  
Savita Kaliya Perumal Veerapandian ◽  
Jean-François Lamonier ◽  
Rino Morent ◽  
...  
Keyword(s):  
Catalyst System ◽  
Product Formation ◽  
Oxidation Activity ◽  
Adsorption Time ◽  
Air Stream ◽  
Ft Ir ◽  
Sequential Adsorption ◽  
Co2 Selectivity ◽  
Oxidation Efficiency ◽  
Adsorption Desorption

The abatement of toluene was studied in a sequential adsorption-plasma catalysis (APC) process. Within this process, Hopcalite was used as bifunctional material: as adsorbent (storage stage) and as catalyst via the oxidation of adsorbed toluene (discharge stage). It was observed that the desorption and oxidation activity of the adsorbed toluene was significantly affected the process variables. In addition, the adsorption time influenced the CO2 selectivity and CO2 yield by changing the interaction between the catalyst and the plasma generated species. At least four APC sequences were performed for each examined condition suggesting that Hopcalite is very stable under plasma exposure during all the sequences. Consequently, these results could contribute to advance the plasma–catalyst system with an optimal VOC oxidation efficiency. The catalytic activity, amount of toluene adsorbed, amount of toluene desorbed and product formation have been quantified by FT-IR. Moreover, the catalyst was characterized by XRD, H2-TPR, N2 adsorption–desorption analysis and XPS. Hopcalite shows a good CO2 selectivity and CO2 yield when the APC process is performed with an adsorption time of 20 min and a plasma treatment with a discharge power of 46 W which leads to a low energy cost of 11.6 kWh·m−3 and energy yields of toluene and CO2 of 0.18 (±0.01) g·kWh−1 and 0.48 (±0.06) g·kWh−1 respectively.

scholarly journals Polymerization of Norbornene by Ternary Catalyst System of AlEt3-TiCl4-Halogen

1967 ◽  
Vol 70 (3) ◽  
pp. 375-377
Author(s):  
Shiro KOBAYASHI ◽  
Takeo SAEGUSA ◽  
Junji FURUKAWA
Keyword(s):  
Catalyst System ◽  
Ternary Catalyst

Efficient ternary catalyst system for the copolymerization of lactide, epoxides and CO2: new insights into the cooperative mechanism

2021 ◽  
Author(s):  
Xiang Li ◽  
Chenyang Hu ◽  
Ranlong Duan ◽  
Zhuangzhuang Liang ◽  
Xuan Pang ◽  
...  
Keyword(s):  
Catalyst System ◽  
Multiblock Copolymer ◽  
Ternary Catalyst

Ternary catalyst system (TCS) is an emerging type of catalysts for the synthesis of multiblock copolymer of lactide (LA), epoxides and CO2. For our previous ternary catalyst system (SalenCoIII-dinitrophenol (DNP),...

Peroxisome proliferation: Organelles or activity as an endpoint?

1993 ◽  
Vol 51 ◽  
pp. 396-397
Author(s):  
Catherine A. Taylor ◽  
Bruce M. Jarnot
Keyword(s):  
Acid Oxidation ◽  
Peroxisome Proliferation ◽  
Post Dose ◽  
Oxidation Activity ◽  
Wasting Syndrome ◽  
Perfluorodecanoic Acid ◽  
Hypolipidemic Agent ◽  
Commercially Important ◽  
Acyl Coa Oxidase ◽  
Mitochondrial Disruption

Peroxisome induction can be expressed as an increase in peroxisome area (proliferation) or as an increase in peroxisomal fatty acid oxidation (activity). This study compares proliferation and activity as endpoints for hepatic peroxisome induction by perfluorodecanoic acid (PFDA). Fluorocarboxylic acids such as PFDA represent a class of compounds possessing commercially important surfactant properties. A single 50 mg/Kg ip. dose of PFDA produces a characteristic “wasting syndrome” in male F-344 rats. Symptoms include hypophagia, weight loss, hepatomegaly, and delayed lethality. Hepatic studies reveal changes similar to those seen with the hypolipidemic agent clofibrate. These include mitochondrial disruption, endoplasmic reticulum and peroxisome proliferation, and increased peroxisomal acyl-CoA oxidase activity.Male Fisher-344 rats received a single ip. dose of 2, 20, or 50mg/Kg PFDA dissolved in 1:1 propylene glycol/water and were sacrificed 8 days post-dose. All control rats received an equal volume of vehicle ip. Animals were provided food and water ad libitum, except pair-fed controls which received the same restrictive food intake consumed by their weight-paired dosed partners (50mg/Kg PFDA group) to simulate the hypophagia associated with PFDA.

Direct Observation of Chain Lengths and Conformations in Oligofluorene Distributions from Controlled Polymerization by Double Electron-Electron Resonance

2019 ◽  
Author(s):  
Dennis Bücker ◽  
Annika Sickinger ◽  
Julian D. Ruiz Perez ◽  
Manuel Oestringer ◽  
Stefan Mecking ◽  
...  
Keyword(s):  
Chain Length ◽  
Length Distribution ◽  
Catalyst System ◽  
Chain Conformation ◽  
Controlled Polymerization ◽  
Chain Length Distribution ◽  
Electron Resonance ◽  
Double Electron ◽  
The Individual ◽  
Double Electron Electron Resonance

Synthetic polymers are mixtures of different length chains, and their chain length and chain conformation is often experimentally characterized by ensemble averages. We demonstrate that Double-Electron-Electron-Resonance (DEER) spectroscopy can reveal the chain length distribution, and chain conformation and flexibility of the individual n-mers in oligo-(9,9-dioctylfluorene) from controlled Suzuki-Miyaura Coupling Polymerization (cSMCP). The required spin-labeled chain ends were introduced efficiently via a TEMPO-substituted initiator and chain terminating agent, respectively, with an in situ catalyst system. Individual precise chain length oligomers as reference materials were obtained by a stepwise approach. Chain length distribution, chain conformation and flexibility can also be accessed within poly(fluorene) nanoparticles.

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