Spectroscopic Definition of the Copper Active Sites in Mordenite: Selective Methane Oxidation

2015 ◽  
Vol 137 (19) ◽  
pp. 6383-6392 ◽  
Author(s):  
Pieter Vanelderen ◽  
Benjamin E. R. Snyder ◽  
Ming-Li Tsai ◽  
Ryan G. Hadt ◽  
Julie Vancauwenbergh ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Active Sites ◽  
Definition Of

Theoretical Study on Methane Oxidation Catalyzed by Fe/ZSM-5: The Significant Role of Water on Binuclear Iron Active Sites

2016 ◽  
Vol 120 (48) ◽  
pp. 27422-27429 ◽  
Author(s):  
Miao He ◽  
Jie Zhang ◽  
Xiu-Liang Sun ◽  
Biao-Hua Chen ◽  
Yang-Gang Wang
Keyword(s):  
Methane Oxidation ◽  
Significant Role ◽  
Active Sites ◽  
Theoretical Study ◽  
Iron Active Sites ◽  
Binuclear Iron

scholarly journals Spectroscopic Definition of the Ferroxidase Site in M Ferritin: Comparison of Binuclear Substrate vs Cofactor Active Sites

2008 ◽  
Vol 130 (29) ◽  
pp. 9441-9450 ◽  
Author(s):  
Jennifer K. Schwartz ◽  
Xiaofeng S. Liu ◽  
Takehiko Tosha ◽  
Elizabeth C. Theil ◽  
Edward I. Solomon
Keyword(s):  
Active Sites ◽  
Definition Of

Size effects of Pd nanoparticles supported over CeZrPAl for methane oxidation

2020 ◽  
Vol 10 (23) ◽  
pp. 7875-7882
Author(s):  
Junchen Du ◽  
Depeng Zhao ◽  
Chengxiong Wang ◽  
Yunkun Zhao ◽  
Hong Li ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Size Effects ◽  
Active Sites ◽  
Pd Nanoparticles ◽  
Intrinsic Activity ◽  
Catalytic Methane Oxidation

Pd nanoparticles accompanied with distorted morphology result in considerable active sites and enhance the intrinsic activity for catalytic methane oxidation.

Procedure to tailor activity of methane combustion catalyst: Relation between Pd/PdOx active sites and methane oxidation activity

2011 ◽  
Vol 397 (1-2) ◽  
pp. 54-61 ◽  
Author(s):  
Niko M. Kinnunen ◽  
Janne T. Hirvi ◽  
Tapani Venäläinen ◽  
Mika Suvanto ◽  
Tapani A. Pakkanen
Keyword(s):  
Methane Oxidation ◽  
Active Sites ◽  
Methane Combustion ◽  
Oxidation Activity ◽  
Combustion Catalyst

Hydrophobic zeolite modification for in situ peroxide formation in methane oxidation to methanol

Science ◽  
2020 ◽  
Vol 367 (6474) ◽  
pp. 193-197 ◽  
Author(s):  
Zhu Jin ◽  
Liang Wang ◽  
Erik Zuidema ◽  
Kartick Mondal ◽  
Ming Zhang ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Active Sites ◽  
Catalyst System ◽  
Oxidation Of Methane ◽  
Conversion Of Methane ◽  
Low Efficiency ◽  
Mild Temperature ◽  
Diffusion Of Hydrogen ◽  
Zeolite Modification

Selective partial oxidation of methane to methanol suffers from low efficiency. Here, we report a heterogeneous catalyst system for enhanced methanol productivity in methane oxidation by in situ generated hydrogen peroxide at mild temperature (70°C). The catalyst was synthesized by fixation of AuPd alloy nanoparticles within aluminosilicate zeolite crystals, followed by modification of the external surface of the zeolite with organosilanes. The silanes appear to allow diffusion of hydrogen, oxygen, and methane to the catalyst active sites, while confining the generated peroxide there to enhance its reaction probability. At 17.3% conversion of methane, methanol selectivity reached 92%, corresponding to methanol productivity up to 91.6 millimoles per gram of AuPd per hour.

Catalytic cycle of the partial oxidation of methane to methanol over Cu-ZSM-5 revealed using DFT calculations

2021 ◽  
Vol 23 (8) ◽  
pp. 4963-4974
Author(s):  
Xi Yu ◽  
Liangshu Zhong ◽  
Shenggang Li
Keyword(s):  
Dft Calculations ◽  
Methane Oxidation ◽  
Partial Oxidation ◽  
Active Sites ◽  
Partial Oxidation Of Methane ◽  
Catalytic Cycle ◽  
Oxidation Of Methane

Methane oxidation to methanol over Cu-ZSM-5 is found using DFT calculations to involve both [Cu2(O2)]2+ and [Cu2(μ-O)]2+ active sites.

[NiFe]-hydrogenases: spectroscopic and electrochemical definition of reactions and intermediates

2005 ◽  
Vol 363 (1829) ◽  
pp. 937-954 ◽  
Author(s):  
Fraser A Armstrong ◽  
Simon P.J Albracht
Keyword(s):  
Fuel Cells ◽  
Active Sites ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Energy Technologies ◽  
Highly Active ◽  
Definition Of ◽  
Micro Organisms ◽  
Electron Paramagnetic

Production and usage of di-hydrogen, H 2 , in micro-organisms is catalysed by highly active, ‘ancient’ metalloenzymes known as hydrogenases. Based on the number and identity of metal atoms in their active sites, hydrogenases fall into three main classes, [NiFe]-, [FeFe]- and [Fe]-. All contain the unusual ligand CO (and in most cases CN − as well) making them intriguing examples of ‘organometallic’ cofactors. These ligands render the active sites superbly ‘visible’ using infrared spectroscopy, which complements the use of electron paramagnetic resonance spectroscopy in studying mechanisms and identifying intermediates. Hydrogenases are becoming a focus of attention for research into future energy technologies, not only H 2 production but also H 2 oxidation in fuel cells. Hydrogenases immobilized on electrodes exhibit high electrocatalytic activity, providing not only an important new technique for their investigation, but also a basis for novel fuel cells either using the enzyme itself, or inspired synthetic catalysts. Favourable comparisons have been made with platinum electrocatalysts, an advantage of enzymes being their specificity for H 2 and tolerance of CO. A challenge for exploiting hydrogenases is their sensitivity to O 2 , but some organisms are known to produce enzymes that overcome this problem by subtle alterations of the active site and gas access channels.

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