Structural inhomogeneity as a factor promoting the homogenous catalysis of CO2 hydrogenation by (PMe3)4RuH2

2019 ◽  
Vol 21 (35) ◽  
pp. 19252-19268
Author(s):  
Guang-Jie Xia ◽  
Jianwen Liu ◽  
Zhi-Feng Liu
Keyword(s):  
Co2 Hydrogenation ◽  
Catalytic Cycle ◽  
Structural Inhomogeneity ◽  
Inhomogeneous Distribution ◽  
Homogenous Catalysis

Inhomogeneous distribution of additive molecules around a catalyst could play an important role in a homogeneous catalytic cycle.

scholarly journals Catalytic reactivity of an iridium complex with a proton responsive N-donor ligand in CO2 hydrogenation to formate

RSC Advances ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 1346-1350 ◽  
Author(s):  
Gunniya Hariyanandam Gunasekar ◽  
Yeahsel Yoon ◽  
Il-hyun Baek ◽  
Sungho Yoon
Keyword(s):  
Structural Instability ◽  
Co2 Hydrogenation ◽  
Catalytic Cycle ◽  
Iridium Complex ◽  
Donor Ligand ◽  
Excellent Activity ◽  
Catalytic Reactivity ◽  
Half Sandwich

A bibenzimidazole ligated half-sandwich Ir complex [Cp*Ir(BiBzImH2)Cl]Cl shows superior activity than that of its bipyridine counterpart. Owing to the structural instability, the initial excellent activity of [Cp*Ir(BiBzImH2)Cl]Cl was reduced when catalytic cycle proceeds.

Theoretical Investigation of a Parallel Catalytic Cycle in CO2 Hydrogenation by (PNP)IrH3

2015 ◽  
Vol 34 (20) ◽  
pp. 4932-4940 ◽  
Author(s):  
Irina Osadchuk ◽  
Toomas Tamm ◽  
Mårten S. G. Ahlquist
Keyword(s):  
Theoretical Investigation ◽  
Co2 Hydrogenation ◽  
Catalytic Cycle

The Structure and Rearrangements of a Complete Polyketide Synthase Module During its Catalytic Cycle

Planta Medica ◽  
2013 ◽  
Vol 79 (10) ◽  
Author(s):  
DH Sherman ◽  
G Skiniotis ◽  
JL Smith ◽  
K Håkansson ◽  
S Dutta ◽  
...  
Keyword(s):  
Polyketide Synthase ◽  
Catalytic Cycle

Catalytic, Enantioselective Syn-Diamination of Alkenes

2019 ◽  
Author(s):  
Zhonglin Tao ◽  
Brad Gilbert ◽  
Scott Denmark
Keyword(s):  
General Solution ◽  
Organic Synthesis ◽  
Medicinal Chemistry ◽  
Catalytic Cycle ◽  
Bifunctional Nucleophile

The enantioselective, vicinal diamination of alkenes represents one of the stereocontrolled additions that remains an outstanding challenge in organic synthesis. A general solution to this problem would enable the efficient and selective preparation of widely useful, enantioenriched diamines for applications in medicinal chemistry and catalysis. In this Article we describe the first enantioselective, <i>syn-</i>diamination of simple alkenes mediated by a chiral, enantioenriched organoselenium catalyst together with a <i>N,N’-</i>bistosyl urea as the bifunctional nucleophile and <i>N-</i>fluorocollidinium tetrafluoroborate as the stoichiometric oxidant. Diaryl, aryl-alkyl, and alkyl-alkyl olefins bearing a variety of substituents are all diaminated in consistently high enantioselectivities selectivities but variable yields. The reaction likely proceeds through a Se(II)/Se(IV) redox catalytic cycle reminiscent of the <i>syn-</i>dichlorination reported previously. Furthermore, the <i>syn</i>-stereospecificity of the transformation shows promise for highly enantioselective diaminations of alkenes with no strong steric or electronic bias.

CO2 hydrogenation to methanol catalyzed by Ni5Ga3 metal alloy

2019 ◽  
Author(s):  
Yuhan Men ◽  
Xin Fang ◽  
Fan Wu ◽  
Ranjeet Singh ◽  
Penny Xiao ◽  
...  
Keyword(s):  
Co2 Hydrogenation ◽  
Metal Alloy

Nickel-Catalyzed Multicomponent Coupling Reaction of Alkyl Halides, Isocyanides and H2O: An Expedient Way to Access Alkyl Amides

Synthesis ◽  
2020 ◽  
Vol 52 (22) ◽  
pp. 3466-3472
Author(s):  
Yunkui Liu ◽  
Bingwei Zhou ◽  
Qiao Li ◽  
Hongwei Jin
Keyword(s):  
Functional Group ◽  
Coupling Reaction ◽  
Alkyl Halides ◽  
Previous Literature ◽  
Catalytic Cycle ◽  
Reaction Conditions ◽  
Multicomponent Coupling ◽  
Easy Operation

We herein describe a Ni-catalyzed multicomponent coupling reaction of alkyl halides, isocyanides, and H2O to access alkyl amides. Bench-stable NiCl2(dppp) is competent to initiate this transformation under mild reaction conditions, thus allowing easy operation and adding practical value. Substrate scope studies revealed a broad functional group tolerance and generality of primary and secondary alkyl halides in this protocol. A plausible catalytic cycle via a SET process is proposed based on preliminary experiments and previous literature.

scholarly journals Production of Fuels and Chemicals from a CO2/H2 Mixture

Reactions ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 130-146
Author(s):  
Yali Yao ◽  
Baraka Celestin Sempuga ◽  
Xinying Liu ◽  
Diane Hildebrandt
Keyword(s):  
Co2 Hydrogenation ◽  
Water Gas Shift ◽  
Liquid Fuels ◽  
Saturated Hydrocarbons ◽  
Reverse Water Gas Shift ◽  
Cu Catalyst ◽  
In Series ◽  
Fuels And Chemicals ◽  
Water Gas ◽  
Aspen Simulation

In order to explore co-production alternatives, a once-through process for CO2 hydrogenation to chemicals and liquid fuels was investigated experimentally. In this approach, two different catalysts were considered; the first was a Cu-based catalyst that hydrogenates CO2 to methanol and CO and the second a Fisher–Tropsch (FT) Co-based catalyst. The two catalysts were loaded into different reactors and were initially operated separately. The experimental results show that: (1) the Cu catalyst was very active in both the methanol synthesis and reverse-water gas shift (R-WGS) reactions and these two reactions were restricted by thermodynamic equilibrium; this was also supported by an Aspen plus simulation of an (equilibrium) Gibbs reactor. The Aspen simulation results also indicated that the reactor can be operated adiabatically under certain conditions, given that the methanol reaction is exothermic and R-WGS is endothermic. (2) the FT catalyst produced mainly CH4 and short chain saturated hydrocarbons when the feed was CO2/H2. When the two reactors were coupled in series and the presence of CO in the tail gas from the first reactor (loaded with Cu catalyst) significantly improves the FT product selectivity toward higher carbon hydrocarbons in the second reactor compared to the standalone FT reactor with only CO2/H2 in the feed.

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