Catalytic reduction of dimethylsulfoxide by molecular hydrogen using rhodium(III) complexes

1969 ◽  
Vol 47 (24) ◽  
pp. 4521-4526 ◽  
Author(s):  
B. R. James ◽  
F. T. T. Ng (Miss) ◽  
G. L. Rempel
Keyword(s):  
Molecular Hydrogen ◽  
Catalytic Reduction ◽  
Catalytic Efficiency ◽  
Hydride Complex ◽  
Mild Conditions ◽  
Kinetics Of

Dimethylsulfoxide is reduced by molecular hydrogen under mild conditions to dimethylsulfide and water in the presence of rhodium(III) complexes as catalysts. The kinetics of the systems using RhCl3.3H2O and cis-RhCl3(Et2S)3 have been investigated, and a mechanism involving reduction of coordinated dimethylsulfoxide in a rhodium(III) hydride complex is postulated. The catalytic efficiency of the systems decreases slowly due to the production of inactive rhodium(I) species.

Kinetics of catalytic reduction of nitrogen oxide by carbon monoxide on CuO/Al2O3 catalyst

1983 ◽  
Vol 48 (11) ◽  
pp. 3202-3208 ◽  
Author(s):  
Zdeněk Musil ◽  
Vladimír Pour
Keyword(s):  
Carbon Monoxide ◽  
Nitrogen Oxide ◽  
Rate Equation ◽  
Catalytic Reduction ◽  
Zero Order ◽  
Spectroscopic Measurements ◽  
First Order ◽  
Ir Spectroscopic ◽  
Kinetics Of ◽  
Al2o3 Catalyst

The kinetics of the reduction of nitrogen oxide by carbon monoxide on CuO/Al2O3 catalyst (8.36 mass % CuO) were determined at temperatures between 413 and 473 K. The reaction was found to be first order in NO and zero order in CO. The observed kinetics are consistent with a rate equation derived from a mechanism proposed on the basis of IR spectroscopic measurements.

scholarly journals PARP1 exhibits enhanced association and catalytic efficiency with γH2A.X-nucleosome

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Deepti Sharma ◽  
Louis De Falco ◽  
Sivaraman Padavattan ◽  
Chang Rao ◽  
Susana Geifman-Shochat ◽  
...  
Keyword(s):  
Dna Damage ◽  
Mutational Analysis ◽  
Catalytic Efficiency ◽  
Double Strand Breaks ◽  
Genomic Integrity ◽  
Dna Double Strand Breaks ◽  
Strand Breaks ◽  
Nucleosome Core ◽  
Epigenetic Marker ◽  
Kinetics Of

AbstractThe poly(ADP-ribose) polymerase, PARP1, plays a key role in maintaining genomic integrity by detecting DNA damage and mediating repair. γH2A.X is the primary histone marker for DNA double-strand breaks and PARP1 localizes to H2A.X-enriched chromatin damage sites, but the basis for this association is not clear. We characterize the kinetics of PARP1 binding to a variety of nucleosomes harbouring DNA double-strand breaks, which reveal that PARP1 associates faster with (γ)H2A.X- versus H2A-nucleosomes, resulting in a higher affinity for the former, which is maximal for γH2A.X-nucleosome that is also the activator eliciting the greatest poly-ADP-ribosylation catalytic efficiency. The enhanced activities with γH2A.X-nucleosome coincide with increased accessibility of the DNA termini resulting from the H2A.X-Ser139 phosphorylation. Indeed, H2A- and (γ)H2A.X-nucleosomes have distinct stability characteristics, which are rationalized by mutational analysis and (γ)H2A.X-nucleosome core crystal structures. This suggests that the γH2A.X epigenetic marker directly facilitates DNA repair by stabilizing PARP1 association and promoting catalysis.

In-situ stabilization of silver nanoparticles in polymer hydrogels for enhanced catalytic reduction of macro and micro pollutants

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Luqman Ali Shah ◽  
Rida Javed ◽  
Mohammad Siddiq ◽  
Iram BiBi ◽  
Ishrat Jamil ◽  
...  
Keyword(s):  
Catalytic Reduction ◽  
Thermo Gravimetric Analysis ◽  
Activation Parameters ◽  
Reduction Reaction ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
In Situ Stabilization ◽  
Hybrid Hydrogels ◽  
Kinetics Of

AbstractThe in-situ stabilization of Ag nanoparticles is carried out by the use of reducing agent and synthesized three different types of hydrogen (anionic, cationic, and neutral) template. The morphology, constitution and thermal stability of the synthesized pure and Ag-entrapped hybrid hydrogels were efficiently confirmed using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and thermo gravimetric analysis (TGA). The prepared hybrid hydrogels were used in the decolorization of methylene blue (MB) and azo dyes congo red (CR), methyl Orange (MO), and reduction of 4-nitrophenol (4-NP) and nitrobenzene (NB) by an electron donor NaBH4. The kinetics of the reduction reaction was also assessed to determine the activation parameters. The hybrid hydrogen catalysts were recovered by filtration and used continuously up to six times with 98% conversion of pollutants without substantial loss in catalytic activity. It was observed that these types of hydrogel systems can be used for the conversion of pollutants from waste water into useful products.

Ketone hydrogenation catalyzed by a new iron(ii)–PNN complex

2016 ◽  
Vol 6 (12) ◽  
pp. 4428-4437 ◽  
Author(s):  
B. Butschke ◽  
M. Feller ◽  
Y. Diskin-Posner ◽  
D. Milstein
Keyword(s):  
Hydride Complex ◽  
Mild Conditions ◽  
Ketone Hydrogenation ◽  
Proton Migration

A dearomatized Fe(ii)–hydride complex mediates the hydrogenation of enolizable ketones under very mild conditions. Deactivation occursviaintramolecular proton migration.

scholarly journals Kinetics of Selective Catalytic Reduction of Nitric Oxide over Pt-Cu-Zsm5 Catalyst

1970 ◽  
Vol 4 (1) ◽  
Author(s):  
Ismail Mohd Saaid ◽  
Abdul Rahman Mohamed and Subhash Bhatia
Keyword(s):  
Nitric Oxide ◽  
Selective Catalytic Reduction ◽  
Active Sites ◽  
No Reduction ◽  
Bimetallic Catalyst ◽  
Catalytic Reduction ◽  
Covalent Bond ◽  
Reaction Parameters ◽  
Heterogeneous Model ◽  
Kinetics Of

Kinetics for the selective catalytic reduction (SCR) of nitric oxide (NO) using i-C4H10 as the reducing agent over Pt-Cu-ZSM5 has been investigated in the temperature range of 200 ?C – 450 oC. Langmuir-Hinshelwood-Hougen-Watson model was proposed for kinetics of the reaction and reaction parameters were evaluated.  The heat of adsorption of NO was found to be considerably high, attributed to strong covalent bond between NO gas molecules and metal active sites.  Using reaction parameters obtained from the experiment, the heterogeneous model could form a good correlation between experimental and simulated values of NO reduction. Key Words: Reaction kinetics, Selective catalytic reduction, NO reduction, Bimetallic catalyst, H-ZSM-5 zeolite.

scholarly journals Kinetics of D/H isotope fractionation between molecular hydrogen and water

2018 ◽  
Vol 242 ◽  
pp. 191-212 ◽  
Author(s):  
Nicholas J. Pester ◽  
Mark E. Conrad ◽  
Kevin G. Knauss ◽  
Donald J. DePaolo
Keyword(s):  
Molecular Hydrogen ◽  
Isotope Fractionation ◽  
Kinetics Of
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