Recherche

Afficher tous les résultats pour

Accueil

Personne

Gabor Laurenczy

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (99)

Direct synthesis of formic acid from carbon dioxide by hydrogenation in acidic media

Gabor Laurenczy, Séverine Joëlle Moret, Paul Joseph Dyson

The chemical transformation of carbon dioxide into useful products becomes increasingly important as CO2 levels in the atmosphere continue to rise as a consequence of human activities. In this article we describe the direct hydrogenation of CO2 into formic ...

Nature Research2014

Direct, in situ determination of pH and solute concentrations in formic acid dehydrogenation and CO2 hydrogenation in pressurised aqueous solutions using 1H and 13C NMR spectroscopy

Gabor Laurenczy, Séverine Joëlle Moret, Paul Joseph Dyson

In water, spin–lattice relaxation times (T1) and calibration curves for chemical shifts have been determined for the 13C and the 1H (C) atoms in HCOOH, HCOONa, CO2, Na2CO3 and NaHCO3 by NMR spectroscopy. These data facilitate kinetic and mechanistic studie ...

Royal Soc Chemistry2013

How Strong Is Hydrogen Bonding in Ionic Liquids? Combined X-ray Crystallographic, Infrared/Raman Spectroscopic, and Density Functional Theory Study

Gabor Laurenczy, Rosario Scopelliti, Paul Joseph Dyson, Zhaofu Fei, Ning Yan, Emilia Paunescu

Hydrogen bonding in ionic liquids based on the 1-(2'-hydroxylethyl)-3-methylimidazolium cation (C(2)OHmim) and various anions (A) of differing H-bond acceptor strength, viz. hexafluorophosphate PF6, tetrafluoroborate BF4, bis-(trifluoro ...

American Chemical Society2013

Cycloaddition of CO2 to epoxides catalyzed by imidazolium-based polymeric ionic liquids

Gabor Laurenczy, Paul Joseph Dyson, Zhaofu Fei, Ning Yan, Felix Daniel Bobbink, Hongbing Song, Emilia Paunescu, Huizhen Liu, Saeideh Ghazali Esfahani

A series of cross-linked ionic polymers based on styrene-functionalized imidazolium salts with chloride, hexafluorophosphate, or tetrafluoroborate counter anions have been prepared and characterized using a range of analytical and spectroscopic techniques ...

Royal Society of Chemistry2013

Development of Palladium Surface-Enriched Heteronuclear Au-Pd Nanoparticle Dehalogenation Catalysts in an Ionic Liquid

Gabor Laurenczy, Paul Joseph Dyson, Ning Yan, Yuan Yuan, Xiao Yuan, Xi Chen

Heteronuclear Au–Pd nanoparticles were prepared and immobilized in the functionalized ionic liquid [C2OHmim][NTf2]. The structural and electronic properties of the nanoparticles were characterized by a range of techniques and the surface of the nanoparticl ...

Wiley-Blackwell2013

Hydrogen storage: beyond conventional methods

Gabor Laurenczy, Séverine Joëlle Moret, Martin Grasemann, Weijia Gan, Andrew Francis Dalebrook

The efficient storage of hydrogen is one of three major hurdles towards a potential hydrogen economy. This report begins with conventional storage methods for hydrogen and broadly covers new technology, ranging from physical media involving solid adsorbent ...

Royal Society of Chemistry2013

Heterogeneous Silica-Supported Ruthenium Phosphine Catalysts for Selective Formic Acid Decomposition

Gabor Laurenczy, Paul Joseph Dyson, Weijia Gan

The water-soluble ruthenium(II)–mTPPTS complex (mTPPTS= meta-trisulfonated triphenylphosphine) efficiently catalyzes the generation of hydrogen from formic acid in aqueous solution. This catalyst has been immobilized in a hydrophilic silica sup- port to fa ...

Wiley-VCH Verlag2013

Ruthenium(II)-Catalyzed Hydrogen Generation from Formic Acid using Cationic, Ammoniomethyl-Substituted Triarylphosphine Ligands

Gabor Laurenczy, Paul Joseph Dyson, Weijia Gan, Dennis Snelders

The selective catalytic decomposition of formic acid into hydrogen and carbon dioxide has been achieved in water under mild conditions. For the first time, a ruthenium ion in combination with series of oligocationic, ammoniomethyl-substituted triarylphosph ...

Wiley-VCH Verlag2013

Towards the development of a hydrogen battery

Gabor Laurenczy, Matthias Beller

A novel Ru-catalyzed hydrogenation of carbon dioxide proceeds with an unprecedented high formic acid to amine ratio (AAR of 2.69), which results in an improved energy content. The presented catalyst system allows for reversible fast hydrogen loading (even ...

Royal Soc Chemistry2012

Formic acid as a hydrogen source – recent developments and future trends

Gabor Laurenczy, Martin Grasemann

Formic acid has recently been suggested as a promising hydrogen storage material. The basic concept is briefly discussed and the recent advances in the development of formic acid dehydrogenation catalysts are shown. Both the state of research for heterogen ...

Royal Soc Chemistry2012

Tuning the Chemoselectivity of Rh Nanoparticle Catalysts by Site-Selective Poisoning with Phosphine Ligands: The Hydrogenation of Functionalized Aromatic Compounds

Gabor Laurenczy, Paul Joseph Dyson, Ning Yan, Weijia Gan, Dennis Snelders

The hydrogenation of phenylacetone to cyclohexylacetone, in which the aromatic ring is selectively reduced in preference to the carbonyl group, has been achieved with chemoselectivities exceeding 90%. The catalyst (precatalyst) used to achieve this transfo ...

2012

Striking Influence of the Catalyst Support and Its Acid–Base Properties: New Insight into the Growth Mechanism of Carbon Nanotubes

Gabor Laurenczy, Jin Won Seo, Arnaud Magrez, Donatello Acquaviva, Juan Carlos Andresen, Rita Smajda, Endre Horvath

In the accepted mechanisms of carbon nanotube (CNT) growth by catalytic chemical vapor deposition (CCVD), the catalyst support is falsely considered as a passive material whose only role is to prevent catalytic particles from coarsening. The chemical chang ...

2011

Supported nitrogen-modified Pd nanoparticles for the selective hydrogenation of 1-hexyne

Lioubov Kiwi, Gabor Laurenczy, Paul Joseph Dyson, Rocio Micaela Crespo Quesada, Ryan Dykeman

2,2′-Bipyridine (bipy) and an imidazolium-functionalized bipy ligand were used in the synthesis of palladium nanoparticles in water and in ionic liquid. The function of such ligands was twofold: first, as stabilizing agents to prevent the agglomeration of ...

2011

Di-n-butyltin(IV)-catalyzed dimethyl carbonate synthesis from carbon dioxide and methanol: An in situ high pressure 119Sn{1H} NMR spectroscopic study

Gabor Laurenczy

The reactivity of five di-n-butyltin(IV) complexes, n-Bu2Sn(OR)(2) (1), n-Bu2SnO (3), n-Bu2Sn(OR)O (4), (n-Bu2SnO)(2)(CO2) (6) and (n-Bu2SnO)(6)(n-Bu2SnOR)(2)(CO3) (7) (R = CH3), with CO2, suggested as possible catalyst precursors and key-interme ...

Elsevier2011

Hydrogen Storage and Delivery: The Carbon Dioxide – Formic Acid Couple

Gabor Laurenczy

Carbon dioxide and the carbonates, the available natural C-1 sources, can be easily hydrogenated into formic acid and formates in water; the rate of this reduction strongly depends on the pH of the solution. This reaction is catalysed by ruthenium(II) pre- ...

Schweizerische Chemische Gesellschaft2011

Efficient Dehydrogenation of Formic Acid Using an Iron Catalyst

Gabor Laurenczy, Paul Joseph Dyson, Matthias Beller

Hydrogen is one of the essential reactants in the chemical industry, though its generation from renewable sources and storage in a safe and reversible manner remain challenging. Formic acid (HCO2H or FA) is a promising source and storage material in this r ...

American Association for the Advancement of Science2011

Synthesis of Gold Nanoparticle Catalysts Based on a New Water-Soluble Ionic Polymer

Gabor Laurenczy, Paul Joseph Dyson, Ilaria Biondi

A new water-soluble methyl-imidazolium-based ionic polymer was synthesized by ring-opening metathesis polymerization that was subsequently used to prepare aqueous gold nanoparticle solutions which were characterized by UVvis spectroscopy and transmission e ...

2011

Synthesis of Room-Temperature Ionic Liquids with the Weakly Coordinating [Al(ORF)4]- Anion (RF=C(H)(CF3)2) and the Determination of Their Principal Physical Properties

Gabor Laurenczy, Paul Joseph Dyson, Safak Bulut

A large series of ionic liqs. (ILs) based on the weakly coordinating alkoxyaluminate [Al(hfip)4]- (hfip: hexafluoroisopropoxy) with classical as well as functionalized cations were prepd., and their principal phys. properties detd. M.ps. are between 0 ([C4 ...

2010

Influence of water-soluble sulfonated phosphine ligands on ruthenium catalyzed generation of hydrogen from formic acid

Gabor Laurenczy, Céline Fellay, Paul Joseph Dyson, Weijia Gan

Hydrogen can be generated from formic acid in aq. phase homogeneous catalytic reactions using ruthenium catalysts with water-sol. phosphine ligands. A comparison of tri-, di-, and mono-sulfonato triphenylphosphine, disulfonato diphenyl-alkyl-phosphines (Ph ...

Taylor & Francis2010

Crystallisation of inorganic salts containing 18-crown-6 from ionic liquids

Gabor Laurenczy, Rosario Scopelliti, Paul Joseph Dyson, Zhaofu Fei, Ning Yan

Reaction of the zwitterionic imidazolium salt [(CH2COOH)(CH2COO)i.m.] with K2CO3 or BaO in the presence of 18-crown-6 affords the salts [(CH2COO)2i.m.][K(18-crown-6)] and [(CH2COO)2i.m.]2[Ba(18-crown-6)]. Recrystn. of these crown complexes from the ionic l ...

Elsevier2010

Page 3 sur 5