Pre-determination of the epoxidation degree of polydienes using methyltrioxorhenium–CH2Cl2/H2O2 biphasic catalytic system

2005 ◽  
Vol 64 (2) ◽  
pp. 83-91 ◽  
Author(s):  
José R. Gregório ◽  
Annelise E. Gerbase ◽  
Ana N.F. Mendes ◽  
Paulo D. Marcico ◽  
Adilson Rigo
Keyword(s):  
Catalytic System ◽  
Biphasic Catalytic System

Application of the Bismuth Film Electrode for Voltammetric Determination of Titanium Using Ti(IV)-Oxalate-Chlorate Catalytic System

2009 ◽  
pp. NA-NA ◽  
Author(s):  
Andrzej Bobrowski ◽  
Agnieszka Królicka ◽  
Karolina Pacan ◽  
Jerzy Zarębski
Keyword(s):  
Catalytic System ◽  
Voltammetric Determination ◽  
Film Electrode ◽  
Bismuth Film ◽  
Bismuth Film Electrode

Studies on 1-dodecene hydroformylation in biphasic catalytic system containing mixed micelle

2003 ◽  
Vol 194 (1-2) ◽  
pp. 13-17 ◽  
Author(s):  
Min Li ◽  
Yaozhong Li ◽  
Hua Chen ◽  
Yu-e He ◽  
Xianjun Li
Keyword(s):  
Catalytic System ◽  
Mixed Micelle ◽  
Biphasic Catalytic System

Long chain olefin hydroformylation in biphasic catalytic system—how the reaction is accelerated

2003 ◽  
Vol 242 (1) ◽  
pp. 85-88 ◽  
Author(s):  
Liangbing Wang ◽  
Hua Chen ◽  
Yu-e He ◽  
Yaozhong Li ◽  
Min Li ◽  
...  
Keyword(s):  
Catalytic System ◽  
Olefin Hydroformylation ◽  
Biphasic Catalytic System ◽  
Long Chain

scholarly journals Production of Additives with Antimicrobial Activity via Tandem Hydroformylation-amine Condensation of Soybean FAME Using an Ionic Liquid-Based Biphasic Catalytic System

2015 ◽  
Author(s):  
Hugo F. Ramalho ◽  
Karlla M. C. Ferreira ◽  
Paula M. A. Machado ◽  
Tamyris B. Silva ◽  
Ellen T. Rangel ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Ionic Liquid ◽  
Catalytic System ◽  
Biphasic Catalytic System

scholarly journals A Use-Store-Reuse (USR) Concept in Catalytic HCOOH Dehydrogenation: Case-Study of a Ru-Based Catalytic System for Long-Term USR under Ambient O2

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 481
Author(s):  
Marinos Theodorakopoulos ◽  
Maria Solakidou ◽  
Yiannis Deligiannakis ◽  
Maria Louloudi
Keyword(s):  
Catalytic System ◽  
Water System ◽  
Catalytic Efficiency ◽  
Ambient Air ◽  
Catalytic Performance ◽  
H2 Production ◽  
Repeated Use ◽  
Biphasic Catalytic System ◽  
First Time

Commercial use of H2 production catalysts requires a repeated use/stop/store and reuse of the catalyst. Ideally, this cycle should be possible under ambient O2. Herein we exemplify the concept of Use-Store-Reuse (USR) of a (Ru-phosphine) catalyst in a biphasic catalytic system, for H2 production via dehydrogenation of HCOOH. The catalytic system can operate uninterrupted for at least four weeks, including storage and reuse cycles, with negligible loss of its catalytic efficiency. The catalytic system consisted of a RuP(CH2CH2PPh2)3 (i.e. RuPP3) in (tri-glyme/water) system, using KOH as a cocatalyst, to promote HCOOH deprotonation. In a USR cycle of 1 week, followed by storage for three weeks under ambient air and reuse, the system achieved in total TONs > 90,000 and TOFs > 4000 h−1. Thus, for the first time, a USR concept with a readily available stable ruthenium catalyst is presented, operating without any protection from O2 or light, and able to retain its catalytic performance.

Voltammetric studies of the Co(II)-tris(hydroxymethyl)aminomethane and sodium perborate volumetric catalytic system

2009 ◽  
Vol 74 (11-12) ◽  
pp. 1715-1725 ◽  
Author(s):  
Jerzy Zarębski ◽  
Andrzej Bobrowski ◽  
Agnieszka Królicka ◽  
Maria Putek
Keyword(s):  
Catalytic System ◽  
Boiling Temperature ◽  
Sodium Perborate ◽  
Large Excess ◽  
Low Concentrations ◽  
Voltammetric Studies ◽  
Voltammetric Technique ◽  
Interfering Ions

It has been shown that in the tris(hydroxymethyl)aminomethane (THAM)/HCl buffer, Co(II) ions catalyze the oxidation of THAM by sodium perborate. The reaction occurs at boiling temperature, and the product of the catalytic THAM oxidation, tris(hydroxymethyl)nitrosomethane, gives a well-defined quasireversible cathodic wave preceding that of the Co(II) ions by about 160 mV. The voltammetric responses of this product are proportional to the amount of sodium perborate and to the concentration of Co(II) ions. In the volumetric catalytic system of Co(II) ions/THAM/sodium perborate, the sensitivity of the determination of Co(II) is increased by one to two orders of magnitude, depending on the voltammetric technique used. Prior to the detection of tris(hydroxymethyl)nitrosomethane, EDTA was added to the solution to form voltammetrically inactive complexes with Co(II) and other interfering ions. Therefore, this method may be applied for the determination of Co(II) ions at low concentrations in the presence of a large excess of interfering ions, in particular Ni(II) and Zn(II).

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