Isotopic solvent effect in hydrogenation on a supported nickel catalyst

A supported nickel catalyst, commonly applied in industrial hydrogenation of fatts and oils, was used to study the effect of replacement of the light water solvent, with heavy water, on the addition of hydrogen on a double bond of maleic acid. The effect was investigated of the composition and temperature of the solution, on the reaction rate, as well as, the relation between the reaction rate and the amount of the acid absorbed on the catalyst. Reaction mechanism with respect to the hydrogenated organic compound is proposed.

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Hydrogenation of maleic acid on nickel-magnesium oxide mixed catalysts and the isotope effect of solvent

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19812043 ◽

1981 ◽

Vol 46 (9) ◽

pp. 2043-2051 ◽

Cited By ~ 1

Author(s):

Rostislav Kudláček ◽

Jana Rexová

Keyword(s):

Reaction Mechanism ◽

Liquid Phase ◽

Magnesium Oxide ◽

Isotope Effect ◽

Maleic Acid ◽

Solid Phase ◽

Light Water ◽

Effect Of Solvent ◽

Liquid Phase Hydrogenation ◽

Mixed Catalyst

The activity of nickel-magnesium oxide mixed catalyst in liquid phase hydrogenation was investigated in dependence on the composition of the solid phase and on the preparation procedure. The isotope effect of substitution of light water by heavy water, the kinetic dependences, and the sorbed amount of the reacting maleic acid were examined with a view to deducing the reaction mechanism.

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NICKEL CATALYTIC PROPERTIES IN REACTION OF LIQUID-PHASE HYDROGENATION OF CARBON-CARBON DOUBLE BOND

IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA ◽

10.6060/tcct.2017606.5409 ◽

2017 ◽

Vol 60 (6) ◽

pp. 95

Author(s):

Andreiy V. Afineevskii ◽

Dmitriy A. Prozorov ◽

Mikhail V. Lukin ◽

Tatiana Yu. Osadchaya ◽

Yaroslav P. Sukhachev

Keyword(s):

Double Bond ◽

Liquid Phase ◽

Nickel Catalyst ◽

Raney Nickel ◽

Catalytic Properties ◽

Supported Nickel Catalyst ◽

Liquid Phase Hydrogenation ◽

Carbon Double Bond ◽

Active Metal ◽

Wide Range

The hydrogenating of carbon-carbon double bond in a molecule of sodium maleate over a partially deactivated catalysts based on nickel in a water solution at atmospheric pressure was investigated. Kinetic regularities of the investigated processes were obtained. It was found that sulfide additives lead to the decrease in an order of the reaction for both skeletal and supported nickel catalysts, however, the correlation of activity versus the amounts of sulfur introduced is complex and independent on the amount of active metal on the catalyst surface. We proposed the method for the synthesis of a supported nickel catalyst resistant to oxidation with atmospheric oxygen and an activity of the one is more than twice better then activity of Raney nickel. The stability of the nickel catalyst (Raney nickel and nickel supported on silica) in the presence of sulfide ions impurities in the reaction system was shown. It was found that the supported nickel catalyst has a much higher resistance to deactivation than the skeletal catalyst. The role of the support at the adsorption of sulfide from solution during deactivation of the investigated catalysts was demonstrated. It was suggested that the higher stability of the supported catalyst for deactivation is due to the sorption of the catalytic poison by silica gel. It is suggested the possibility of adjusting the selectivity of the catalyst deactivation character without changing the nature of the solvent. It was presented the possibility of purposeful variation in a wide range of adsorption properties of the active metal surface relative to the reactants, which makes possible to develop approaches to the synthesis of catalysts with given parameters of activity and selectivity relative to certain classes of organic compounds.Forcitation:Afineevskii A.V., Prozorov D.A., Osadchaya T.Yu., Sukhachev Ya.P., Lukin M.V. Nickel catalytic properties in reaction of liquid-phase hydrogenation of carbon-carbon double bond. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60.N 6. P. 95-101.

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Reaction mechanism and kinetic modeling for the hydrodeoxygenation of triglycerides over alumina supported nickel catalyst

Reaction Kinetics Mechanisms and Catalysis ◽

10.1007/s11144-016-1098-2 ◽

2016 ◽

Vol 120 (1) ◽

pp. 109-128 ◽

Cited By ~ 11

Author(s):

Sudhakara Reddy Yenumala ◽

Sunil K. Maity ◽

Debaprasad Shee

Keyword(s):

Reaction Mechanism ◽

Nickel Catalyst ◽

Kinetic Modeling ◽

Supported Nickel Catalyst

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Vapor phase carbonylation of organic compound over supported transition metal catalysts. V. Vapor-phase carbonylation of dimethyl ether on supported nickel catalyst.

NIPPON KAGAKU KAISHI ◽

10.1246/nikkashi.1988.278 ◽

1988 ◽

pp. 278-283 ◽

Cited By ~ 2

Author(s):

Kohji OMATA ◽

Hiroshi YAGITA ◽

Tsutomu SHIKADA ◽

Kaoru FUJIMOTO ◽

Hiro-o TOMINAGA

Keyword(s):

Organic Compound ◽

Transition Metal ◽

Nickel Catalyst ◽

Dimethyl Ether ◽

Vapor Phase ◽

Metal Catalysts ◽

Transition Metal Catalysts ◽

Supported Nickel Catalyst

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Tailoring neutron beam properties by target-moderator-reflector optimisation

Journal of Neutron Research ◽

10.3233/jnr-210016 ◽

2021 ◽

pp. 1-16

Author(s):

Paul Zakalek ◽

Jingjing Li ◽

Sarah Böhm ◽

Ulrich Rücker ◽

Jörg Voigt ◽

...

Keyword(s):

Neutron Beam ◽

Heavy Water ◽

Neutron Production ◽

Neutron Sources ◽

Light Water ◽

Cold Neutrons ◽

Efficient Coupling ◽

Borated Polyethylene ◽

Compact Design ◽

Neutronic Performance

Compact accelerator-driven neutron sources allow to operate multiple optimised target-moderator-reflector (TMR) units adapted to the requirements of the respective instruments. The compact design of the TMR units allows an efficient coupling of neutron production, neutron moderation and extraction, but requires a novel way of optimisation. The neutronic performance of different TMR units based on polyethylene, heavy water and a mixture of heavy and light water moderators together with Pb and Be reflectors and a borated polyethylene absorber is discussed. Extraction channels for thermal and cold neutrons are investigated regarding the energy and time spectra.

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Three-component reaction involving isoquinoline and dimethyl acethylenedicarboxylate in the presence of indole: Theoretical and experimental investigations of the reaction mechanism

Progress in Reaction Kinetics and Mechanism ◽

10.1177/1468678320956864 ◽

2021 ◽

Vol 46 ◽

pp. 146867832095686

Author(s):

Mohammad Zakarianezhad ◽

Sayyed Mostafa Habibi-Khorassani ◽

Batoul Makiabadi ◽

Elham Zeydabadi

Keyword(s):

Reaction Mechanism ◽

Potential Energy Surfaces ◽

Reaction Rate ◽

Product Configuration ◽

Experimental Investigations ◽

Uv Spectrophotometry ◽

Three Component Reaction ◽

Energy Surfaces ◽

Theoretical Results ◽

Reaction Rate Equation

The reaction kinetics among isoquinoline, dimethyl acetylenedicarboxylate, and indole (as NH-acid) were investigated using ultraviolet (UV) spectrophotometry. The reaction rate equation was obtained, the dependence of the reaction rate on different reactants was determined, and the overall rate constant ( kov) was calculated. By studying the effects of solvent, temperature, and concentration on the reaction rate, some useful information was obtained. A logical mechanism consistent with the experimental observations was proposed. Also, comprehensive theoretical studies were performed to evaluate the potential energy surfaces of all structures that participated in the reaction mechanism. Finally, the proposed mechanism was confirmed by the obtained results and the probable and logical reaction paths and also a correct product configuration were suggested based on the theoretical results.

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