Activity of a skeletal iron catalyst in hydrogenation reactions

1954 ◽  
Vol 3 (3) ◽  
pp. 435-438 ◽  
Author(s):  
L. Kh. Freidlin ◽  
K. G. Rudneva ◽  
A. S. Sultanov
Keyword(s):  
Iron Catalyst ◽  
Hydrogenation Reactions

Hydrogenation through metal septa

1955 ◽  
Vol 230 (1182) ◽  
pp. 301-311 ◽  
Keyword(s):  
Iron Catalyst ◽  
Molecular Nitrogen ◽  
Active Surface ◽  
Hydrogen Atoms ◽  
Substantial Fraction ◽  
Complex Behaviour ◽  
Steady Rate ◽  
Hydrogenation Reactions ◽  
Current Densities ◽  
Rate Of Emergence

A method is described for studying hydrogenation reactions on metal surfaces. With an iron catalyst hydrogen atoms pass at a steady rate to the active surface, through an iron septum, the other face of which is made a cathode in a strong solution of sodium hydroxide. At current densities ( I ) ranging from 0·2 to 2·5A/cm 2 and at temperatures ranging from 90 to 180° C the rate of emergence, N , of molecular hydrogen from the active surface into vacuum, in moles/cm 2 s, can be represented by N = KI n exp ( -E/RT ), K is not sensitive to temperature in the range investigated, n ~ 0·18 and E ~ 7·9 kcal/mole. Plots of N against I give evidence of a limiting rate of permeation at high current densities. Various gases have been brought into contact with the active surface of the iron. Molecular nitrogen neither reacted with the hydrogen permeating through the iron, nor did it block this permeation. More complex behaviour was observed with molecular oxygen. Over a range of conditions there was no combination between oxygen and hydrogen, but a substantial fraction of the iron surface was blocked presumably by chemisorption of oxygen, leaving only part available for permeation of the hydrogen. At higher temperatures, especially at the lower densities, there was appreciable hydrogenation of the oxygen.

Catalytic asymmetric hydrogenation reaction by in situ formed ultra-fine metal nanoparticles in live thermophilic hydrogen-producing bacteria

Nanoscale ◽  
2021 ◽  
Author(s):  
Wei Bing ◽  
Faming Wang ◽  
Yuhuan Sun ◽  
Jinsong Ren ◽  
Xiaogang Qu
Keyword(s):  
Metal Nanoparticles ◽  
Catalytic Hydrogenation ◽  
Asymmetric Hydrogenation ◽  
Environmentally Friendly ◽  
Hydrogenation Reaction ◽  
Highly Efficient ◽  
Hydrogenation Reactions ◽  
Live Bacteria ◽  
Catalytic Asymmetric Hydrogenation

An environmentally friendly biomimetic strategy has been presented and validated for the catalytic hydrogenation reaction in live bacteria. In situ formed ultra-fine metal nanoparticles can realize highly efficient asymmetric hydrogenation reactions.

A stable well-defined copper hydride cluster consolidated with hemilabile phosphines

2021 ◽  
Author(s):  
Shang-Fu Yuan ◽  
Heng-Wang Luyang ◽  
Zhen Lei ◽  
Xiankai Wan ◽  
Jiao-Jiao Li ◽  
...  
Keyword(s):  
Copper Hydride ◽  
Metal Core ◽  
Hydrogenation Reactions

Copper hydrides are very useful in hydrogenation reactions. We report a stable Stryker-type copper hydride reagent protected by hemilabile phosphines: [Cu8H6(dppy)6](OTf)2 (Cu8-H, dppy = diphenylphoshpino-2-pyridine). The metal core of this...

scholarly journals Immobilization of an Iridium(I)-NHC-Phosphine Catalyst for Hydrogenation Reactions under Batch and Flow Conditions

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 656
Author(s):  
Henrietta Kovács ◽  
Krisztina Orosz ◽  
Gábor Papp ◽  
Ferenc Joó ◽  
Henrietta Horváth
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Heterogeneous Catalyst ◽  
Aqueous Phase ◽  
Levulinic Acid ◽  
Flow Reactor ◽  
High Catalytic Activity ◽  
Flow Conditions ◽  
Hydrogenation Reactions ◽  
Excellent Selectivity

Na2[Ir(cod)(emim)(mtppts)] (1) with high catalytic activity in various organic- and aqueous-phase hydrogenation reactions was immobilized on several types of commercially available ion-exchange supports. The resulting heterogeneous catalyst was investigated in batch reactions and in an H-Cube flow reactor in the hydrogenation of phenylacetylene, diphenylacetylene, 1-hexyne, and benzylideneacetone. Under proper conditions, the catalyst was highly selective in the hydrogenation of alkynes to alkenes, and demonstrated excellent selectivity in C=C over C=O hydrogenation; furthermore, it displayed remarkable stability. Activity of 1 in hydrogenation of levulinic acid to γ-valerolactone was also assessed.

Ceria-Based Catalysts for Selective Hydrogenation Reactions: A Critical Review

2021 ◽  
Author(s):  
Kourosh Razmgar ◽  
Mohammednoor Altarawneh ◽  
Ibukun Oluwoye ◽  
Gamini Senanayake
Keyword(s):  
Selective Hydrogenation ◽  
Critical Review ◽  
Hydrogenation Reactions

scholarly journals Hydrogenation of CO2 Promoted by Silicon-Activated H2S: Origin and Implications

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 50
Author(s):  
Xing Liu
Keyword(s):  
Low Temperatures ◽  
Underlying Mechanism ◽  
Reactive Species ◽  
Co2 Hydrogenation ◽  
Usual Method ◽  
Title Reaction ◽  
Hydrogenation Of Co2 ◽  
Hydrogenation Reactions

Unlike the usual method of COx (x = 1, 2) hydrogenation using H2 directly, H2S and HSiSH (silicon-activated H2S) were selected as alternative hydrogen sources in this study for the COx hydrogenation reactions. Our results suggest that it is kinetically infeasible for hydrogen in the form of H2S to transfer to COx at low temperatures. However, when HSiSH is employed instead, the title reaction can be achieved. For this approach, the activation of CO2 is initiated by its interaction with the HSiSH molecule, a reactive species with both a hydridic Hδ− and protonic Hδ+. These active hydrogens are responsible for the successive C-end and O-end activations of CO2 and hence the final product (HCOOH). This finding represents a good example of an indirect hydrogen source used in CO2 hydrogenation through reactivity tuned by silicon incorporation, and thus the underlying mechanism will be valuable for the design of similar reactions.

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