NDLI: The use of electron paramagnetic resonance techniques in the molecular approach to heterogeneous catalytic processes on oxides

Please wait, while we are loading the content...

Stabilization of biochemically interesting intermediates by metal coordination. Part 5.—Complexes of Zn^II, Cu^I, Re^I and Ru^II with singly reduced 2,5-diacetylpyrazine

Novel electron paramagnetic resonance signals from an Fe/S protein containing six iron atoms

High-temperature superconductivity and electron paramagnetic resonance spectroscopy

Electron spin resonance investigation of the electronic structure of hopping centres and the polaronic conduction in iron-containing phosphate glasses

Electron paramagnetic resonance study of the effect of temperature upon copper-impregnated titanium dioxide powders

Effect of magnetic field on radical yields during the photoreduction of xanthene dyes in viscous media

Photoelectron and X-ray emission (PAX) spectroscopy and electronic structure. Thiourea

Ionic solvation. Part 6.—Standard potential of Ag/Ag⁺cryptand (222, 221 and 211) electrode in aprotic media

Influence of ionic association on the B coefficient of the Jones–Dole equation for NaI in water–t-butyl alcohol mixtures at 26 °C

Temperature-programmed desorption study of activated chemisorption involving a precursor state: desorption of water from TiO₂

Intercalation mechanism of nitrogenated bases into V₂O₅ xerogel

Spectroscopic studies of molybdate species deposited on a Nb₂O₅ support

Salt effects in the kinetics of the formation of the iron(III) thiocyanate complex

Molecular self-diffusion of methane in zeolite ZSM-5 by quasi-elastic neutron scattering and nuclear magnetic resonance pulsed field gradient technique

Solubilization of pentanol in sodium dodecylsulphate micelles. Interpretation of calorimetric results using a theoretical model

Viscosities of alkali-metal chlorides and bromides in 2-methoxyethanol at 25 and 35 °C

Kinetics of the reaction between substituted thioureas and the palladium (II) aquocomplex of 1, 1, 7, 7-tetraethyldiethylenetriamine in water and in aqueous micellar solutions

In situ spectroelectrochemical study of the passivation of iron in alkaline solutions

Protonation constant of caffeine in aqueous solution

Ionic equilibria in acetonitrile solutions of 2-, 3- and 4-picoline N-oxide perchlorates, studied by potentiometry and conductometry

Liquid-phase adsorption of binary ethanol–water mixtures on NaZSM-5 zeolites with different silicon/aluminium ratios

Influence of oxidation/reduction pretreatment on hydrogen adsorption on Rh/TiO₂ catalysts. An ¹H nuclear magnetic resonance study

Volumetric properties of mixtures of simple molecular fluids

Study of ultramicroporous carbons by high-pressure sorption. Part 4.—Isotherms and kinetic transport in activated carbons

Kinetic and equilibrium studies associated with the solubilisation of n-pentanol in micellar surfactants

The effect of carboxylic acids on the dissolution of calcite in aqueous solution. Part 1.—Maleic and fumaric acids

Back cover

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 9

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 8

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 7

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 6

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 5

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 4

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 3

Journal of the Chemical Society, Faraday Transactions 1 Vol - 85 Issue - 2

Journal of the Chemical Society, Faraday Transactions 1 Vol -79

Journal of the Chemical Society, Faraday Transactions 1 Vol -69

The use of electron paramagnetic resonance techniques in the molecular approach to heterogeneous catalytic processes on oxides

Content Provider	Royal Society of Chemistry (RSC)
Author	Louis, Catherine Sojka, Zbigniew Che, Michel
Copyright Year	1989
Abstract	This review shows that EPR spectroscopy can be a powerful tool for catalysis research. This is illustrated in the particular case of highly dispersed Mo/SiO2 catalysts prepared by grafting. The different steps of the preparation may be identified: e.g. the EPR changes observed in the Mo5+ coordination sphere during the grafting process of MoCl5 onto silica, showed that the grafted species is probably SiOMoCl4(g⊥= 1.952, g∥= 1.968). The catalyst was also characterized after activation treatment such as thermal reduction. Three different Mo5+ species have been detected. Their coordination sphere was determined using probe molecules such as water, methanol and natural or 13C-enriched carbon monoxide. These Mo5+ species are molybdenyl compounds surrounded by oxygen ligands in distorted octahedral (Mo5+6c)(g⊥= 1.944, g∥= 1.892), square-pyramidal (Mo5+5c)(g⊥= 1.957, g∥= 1.866), and distorted tetrahedral symmetry (Mo5+4c)(g⊥= 1.926, g∥= 1.755). The subscripts 6c, 5c and 4c stand for hexa-, penta- and tetra-coordinated, respectively. The EPR results obtained on UV-irradiated oxidized Mo/SiO2 on which methanol was preadsorbed, are also consistent with the variation of selectivity in methyl formate and formaldehyde with Mo dispersion observed during methanol oxidation. They extend the reaction mechanism previously proposed on the basis of kinetic data. EPR revealed the formation of a hydroxymethyl radical ˙CH2OH. The deactivation of this radical by an ‘external’ redox process is favoured on highly dispersed Mo catalysts such as grafted Mo/SiO2. The process involves radical migration on silica where it can react with SiOCH3 groups, forming methyl formate.
Starting Page	3939
Ending Page	3952
Page Count	14
File Format	PDF
ISSN	03009599
Volume Number	85
Issue Number	12
Journal	Journal of the Chemical Society, Faraday Transactions 1
DOI	10.1039/F19898503939
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Mo Oxygen Methyl formate EPR HEXA Redox Tetrahedral symmetry Grafting Silicon dioxide Formaldehyde Reaction mechanism Electron paramagnetic resonance Carbon monoxide Molybdenum(V) chloride Methanol
Content Type	Text
Resource Type	Article
Subject	Chemistry

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Electron paramagnetic resonance study of catalysts derived from molybdenum hexacarbonyl

Electron paramagnetic resonance and electron spin echo modulation spectroscopic studies on the location and adsorbate interactions of paramagnetic Pd ion species in Pd^II-exchanged K-L zeolite

Exploring the potential of biogenic manganese oxides as water oxidation catalyst and investigating Mn oxidation mechanism using Electron Paramagnetic Resonance (EPR) spectroscopy

Pyranopterin Coordination Controls Molybdenum Electrochemistry in Escherichia coli Nitrate Reductase

Catalytic oxidation of methanol to methyl formate over silver – a new purpose of a traditional catalysis system

Reactive oxygen species formation at Pt nanoparticles revisited by electron paramagnetic resonance and electrochemical analysis

Silica matrix encapsulation as a strategy to control ROS production while preserving photoreactivity in nano-TiO₂

Novel syngas-based process for methyl methacrylate

Electron paramagnetic resonance of plastically deformed semiconductors : a short review

The use of electron paramagnetic resonance techniques in the molecular approach to heterogeneous catalytic processes on oxides

Similar Documents

Electron paramagnetic resonance study of catalysts derived from molybdenum hexacarbonyl

Electron paramagnetic resonance and electron spin echo modulation spectroscopic studies on the location and adsorbate interactions of paramagnetic Pd ion species in PdII-exchanged K-L zeolite

Exploring the potential of biogenic manganese oxides as water oxidation catalyst and investigating Mn oxidation mechanism using Electron Paramagnetic Resonance (EPR) spectroscopy

Pyranopterin Coordination Controls Molybdenum Electrochemistry in Escherichia coli Nitrate Reductase

Catalytic oxidation of methanol to methyl formate over silver – a new purpose of a traditional catalysis system

Reactive oxygen species formation at Pt nanoparticles revisited by electron paramagnetic resonance and electrochemical analysis

Silica matrix encapsulation as a strategy to control ROS production while preserving photoreactivity in nano-TiO2

Novel syngas-based process for methyl methacrylate

Electron paramagnetic resonance of plastically deformed semiconductors : a short review

The use of electron paramagnetic resonance techniques in the molecular approach to heterogeneous catalytic processes on oxides

Electron paramagnetic resonance and electron spin echo modulation spectroscopic studies on the location and adsorbate interactions of paramagnetic Pd ion species in Pd^II-exchanged K-L zeolite

Silica matrix encapsulation as a strategy to control ROS production while preserving photoreactivity in nano-TiO₂