Two-step conversion of Kraft lignin to nylon precursors under mild conditions

Treatment of Kraft lignin, massive byproduct of pulping industry, with dilute aqueous base followed by catalytic hydrogenation of the extracted monomers at ambient pressure yields KA oil, the precursor of high demand nylon polymer.

Download Full-text

Three-Dimensional Network Pd-Ni/γ-Al2O3 Catalysts for Highly Active Catalytic Hydrogenation of Nitrobenzene to Aniline under Mild Conditions

ACS Omega ◽

10.1021/acsomega.1c00441 ◽

2021 ◽

Author(s):

Yang Jiang ◽

Qian Li ◽

Xi Li ◽

Xinyi Wang ◽

Sen Dong ◽

...

Keyword(s):

Catalytic Hydrogenation ◽

Three Dimensional ◽

Mild Conditions ◽

Highly Active ◽

Dimensional Network

Download Full-text

Selective hydrogenation of nitroarenes under mild conditions by the optimization of active sites in a well defined Co@NC catalyst

Green Chemistry ◽

10.1039/d0gc01835j ◽

2020 ◽

Vol 22 (17) ◽

pp. 5730-5741

Author(s):

Shuo Chen ◽

Li-Li Ling ◽

Shun-Feng Jiang ◽

Hong Jiang

Keyword(s):

Particle Size ◽

Catalytic Hydrogenation ◽

Selective Hydrogenation ◽

Active Sites ◽

Metal Organic Framework ◽

Nitro Compounds ◽

Active Species ◽

Mild Conditions ◽

Metal Organic ◽

Aromatic Nitro

The defined catalyst (Co@NC) is prepared through the pyrolysis of the Co-centered metal–organic framework (MOF), in which Co active species (Co–Nx, surface Co NPs) and particle size play important roles in the catalytic hydrogenation of aromatic nitro compounds.

Download Full-text

Selective catalytic hydrogenation of polycyclic aromatic hydrocarbons promoted by ruthenium nanoparticles

Catalysis Science & Technology ◽

10.1039/c4cy01758g ◽

2015 ◽

Vol 5 (5) ◽

pp. 2741-2751 ◽

Cited By ~ 15

Author(s):

Emma Bresó-Femenia ◽

Bruno Chaudret ◽

Sergio Castillón

Keyword(s):

Polycyclic Aromatic Hydrocarbons ◽

Aromatic Hydrocarbons ◽

Catalytic Hydrogenation ◽

Ruthenium Nanoparticles ◽

Mild Conditions ◽

Polycyclic Aromatic

Naphthalene, anthracene, triphenylene and pyrene were partially hydrogenated with selectivities between 80% and 100% under mild conditions using ruthenium NPs.

Download Full-text

Homogeneous electrocatalytic oxidation of ammonia to N2 under mild conditions

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1813368116 ◽

2019 ◽

Vol 116 (8) ◽

pp. 2849-2853 ◽

Cited By ~ 25

Author(s):

Faezeh Habibzadeh ◽

Susanne L. Miller ◽

Thomas W. Hamann ◽

Milton R. Smith

Keyword(s):

Room Temperature ◽

Ammonia Oxidation ◽

Electrochemical Cell ◽

Ambient Pressure ◽

Mass Spectrometry Analysis ◽

Ruthenium Polypyridyl ◽

Spectrometry Analysis ◽

Mild Conditions ◽

Bulk Electrolysis ◽

Ruthenium Polypyridyl Complexes

We report that ruthenium polypyridyl complexes can catalyze ammonia oxidation to dinitrogen at room temperature and ambient pressure. During bulk electrolysis experiments, gas chromatography and mass spectrometry analysis of the headspace in the electrochemical cell showed that dinitrogen and dihydrogen are generated from ammonia with high faradaic efficiencies. A proposed mechanism where a hydrazine complex is the initial N–N bonded intermediate is supported by chemical and electrochemical experiments. This is a well-defined system for homogeneous electrocatalytic ammonia oxidation. It establishes a platform for answering mechanistic questions relevant to using ammonia to store and distribute renewable energy.

Download Full-text

Notizen: Homogene katalytische Hydrierung ungesättigter Carbonsäureester mit H2PtCl6 + SnCl2 in iso-Butanol / Homogeneous Catalytic Hydrogenation of Unsaturated Carboxylic Acid Esters with H2PtCl6 + SnCl2 in iso-Butanol

Zeitschrift für Naturforschung B ◽

10.1515/znb-1977-0523 ◽

1977 ◽

Vol 32 (5) ◽

pp. 597-598 ◽

Cited By ~ 2

Author(s):

Walter Strohmeier ◽

Luise Weigelt

Keyword(s):

Carboxylic Acid ◽

Catalytic Hydrogenation ◽

Reaction Rates ◽

Homogeneous Hydrogenation ◽

Unsaturated Esters ◽

Mild Conditions ◽

Unsaturated Carboxylic Acid ◽

Acid Esters

The catalytical system, prepared from H2PtCl6 + SnCl2 · 2 H2O and the additives HBr and H2O in iso-butanol is very efficient for homogeneous hydrogenation of unsaturated esters under mild conditions. Reaction rates r up to 40 mMol · 1-1 · min-1 and turnover numbers UZ higher than 1.600 are observed.

Download Full-text

Titanium-Mediated Catalytic Hydrogenation of Monocyclic and Polycyclic Arenes

10.26434/chemrxiv.10325204 ◽

2019 ◽

Author(s):

Alejandra Gomez-Torres ◽

J. Rolando Aguilar-Calderón ◽

Angela M. Encerrado-Manriquez ◽

Maren Pink ◽

Alejandro J. Metta-Magaña ◽

...

Keyword(s):

Catalytic Hydrogenation ◽

Group Iv ◽

Mild Conditions ◽

Arene Hydrogenation ◽

Electron Reduction

Two electron-reduction of the Ti(IV) guanidinate complex (ImDippN)(Xyketguan)TiCl2 gives (η6-ImDippN)(xyketguan)Ti (1intra) and (ImDippN)(Xyketguan)Ti(η6-C6H6) (1inter) (xyketguan = [(tBuC=N)C(NXylyl)2]-, Xylyl = 2,5-dimethylphenyl) in the absence or presence of benzene, respectively. These complexes have been found to hydrogenate monocyclic and polycyclic arenes under relatively mild conditions (150 psi, 80 °C) – the first example of catalytic, homogeneous arene hydrogenation with TON > 1 by a Group IV system.

Download Full-text

C−H•••F−C Interactions: A Guide for Designing Fluorous Monodentate Ligands for the Highly Linear-Selective Hydroformylation at Near-Ambient Pressure

10.21203/rs.3.rs-550969/v1 ◽

2021 ◽

Author(s):

Yuchao Deng ◽

Xiaofang Liu ◽

Baiyin Wei ◽

Zhimin Zhou ◽

Kaimin Hua ◽

...

Keyword(s):

Crystal Packing ◽

Ambient Pressure ◽

Chemical Properties ◽

Bidentate Ligands ◽

Organofluorine Compounds ◽

Mild Conditions ◽

Phosphite Ligands ◽

Monodentate Ligands ◽

Physical And Chemical ◽

And Chemical Properties

Abstract Organofluorine compounds often exhibit unique catalytic capabilities with novel structural scaffold, reactivity and mechanisms. Herein, we report a Rh-catalyzed hydroformylation under mild conditions using monodentate phosphite ligands P(OCH2CF3)3 (TTFP) and P(OCH2CF2CH3)3 (TDFP). The ligand were designed with the principle that the inclusion of fluorine-rich group can significantly change the physical and chemical properties of the complex through H•••F hydrogen bonds, the existence of which has been confirmed by crystal-packing studies. These monodentate phosphite ligands self-assemble to form bidentate ligands through C–H•••F–C interactions, and catalysts based on these ligands deliver extremely high regioselectivities in hydroformylation. Aldehydes were formed with up to 92% chemoselectivity, with linear aldehydes formed in high regioselectivity (n:iso=28/1) under a syngas pressure of only 2 atm.

Download Full-text