scholarly journals Mesoporous V-AlPO – New Partial Oxidation Catalyst

2017 ◽  
Vol 4 (3) ◽  
pp. 169 ◽  
Author(s):  
Ch. Subrahmanyam ◽  
B. Viswanathan ◽  
T.K. Varadarajan
Keyword(s):  
Partial Oxidation ◽  
Oxidation Products ◽  
Oxidation States ◽  
Oxidation Catalyst ◽  
Side Chain ◽  
Catalytic Systems ◽  
Chain Oxidation ◽  
Ring Oxidation ◽  
Partial Oxidation Of Toluene

<p>Vanadium incorporated hexagonal mesoporous aluminophosphate characteristic of MCM-41 has been synthesized. Characterization of the catalyst has been done by using low angle XRD, N<sub>2</sub> adsorption, UVVIS DRS, thermal analysis, XPS and ESR spectroscopy. These techniques confirm the presence of vanadium in both +4 and +5 oxidation states in the calcined material. Liquid phase partial oxidation of toluene has been carried out on V-AlPO using 70% TBHP and 30% H<sub>2</sub>O<sub>2</sub> as oxidants. When 70% TBHP is used as an oxidant, it resulted in side chain oxidation giving rise to aldehyde/acid where as with 30% H<sub>2</sub>O<sub>2</sub>, side chain as well as ring oxidation takes place. Catalytic activity of V-AlPO has been compared with that of VMCM-48 and other vanadium containing catalytic systems. It has been observed that mesoporous V-AlPO shows higher conversion and is also selective towards side chain oxidation products. The higher conversion of V-AlPO over V-MCM-48 has been attributed to the stabilization of the active V<sup>+5/+4</sup> species in AlPO framework as compared to silicate analogue.</p>

Characterization of the cytochrome P450 involved in side-chain oxidation of cyclophosphamide in humans

1996 ◽  
Vol 51 (3-4) ◽  
pp. 297-301 ◽  
Author(s):  
F. Bohnenstengel ◽  
U. Hofmann ◽  
M. Eichelbaum ◽  
H. K. Kroemer
Keyword(s):  
Cytochrome P450 ◽  
Side Chain ◽  
Chain Oxidation

In situ bulk structural study on solid-state dynamics and catalytic activity correlations of a H4[PNbMo11O40] partial oxidation catalyst

2005 ◽  
Vol 220 (2/3) ◽  
Author(s):  
Thorsten Ressler ◽  
Olaf Timpe ◽  
Frank Girgsdies
Keyword(s):  
Catalytic Activity ◽  
Solid State ◽  
Structural Study ◽  
Partial Oxidation ◽  
Oxidation Catalyst ◽  
Keggin Type

AbstractWe report on the preparation and characterization of a niobium containing Keggin type heteropolyoxomolybdate (HPOM), H

Rapid Characterization of Amyloid-  Side-Chain Oxidation by Tandem Mass Spectrometry and the Scoring Algorithm for Spectral Analysis

2004 ◽  
Vol 21 (7) ◽  
pp. 1094-1102 ◽  
Author(s):  
Alexandra J. Schiewe ◽  
Lawrence Margol ◽  
Brian A. Soreghan ◽  
Stefani N. Thomas ◽  
Austin J. Yang
Keyword(s):  
Mass Spectrometry ◽  
Spectral Analysis ◽  
Tandem Mass Spectrometry ◽  
Side Chain ◽  
Tandem Mass ◽  
Chain Oxidation ◽  
Scoring Algorithm ◽  
Rapid Characterization

Catalytic Fluorination of Boron Compounds at a Bismuth Redox Platform

2019 ◽  
Author(s):  
Oriol Planas ◽  
Feng Wang ◽  
Markus Leutzsch ◽  
Josep Cornella
Keyword(s):  
Transition Metal ◽  
Main Group ◽  
Group Element ◽  
Oxidation States ◽  
Boron Compounds ◽  
Main Text ◽  
Main Group Element ◽  
Rational Ligand Design ◽  
Supplementary Material

The ability of bismuth to maneuver between different oxidation states in a catalytic redox cycle, mimicking the canonical organometallic steps associated to a transition metal, is an elusive and unprecedented approach in the field of homogeneous catalysis. Herein we present a catalytic protocol based on bismuth, a benign and sustainable main-group element, capable of performing every organometallic step in the context of oxidative fluorination of boron compounds; a territory reserved to transition metals. A rational ligand design featuring hypervalent coordination together with a mechanistic understanding of the fundamental steps, permitted a catalytic fluorination protocol based on a Bi(III)/Bi(V) redox couple, which represents a unique example where a main-group element is capable of outperforming its transition metal counterparts.<br>A main text and supplementary material have been attached as pdf files containing all the methodology, techniques and characterization of the compounds reported.<br>

Characterization of Non-volatile Oxidation Products Formed from Triolein in a Model Study at Frying Temperature

2021 ◽  
Vol 69 (11) ◽  
pp. 3466-3478
Author(s):  
Sílvia Petronilho ◽  
Bruna Neves ◽  
Tânia Melo ◽  
Sara Oliveira ◽  
Eliana Alves ◽  
...  
Keyword(s):  
Oxidation Products ◽  
Frying Temperature ◽  
Model Study ◽  
Volatile Oxidation Products

scholarly journals Characterization of Charge States in Conducting Organic Nanoparticles by X-ray Photoemission Spectroscopy

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2058
Author(s):  
Jordi Fraxedas ◽  
Antje Vollmer ◽  
Norbert Koch ◽  
Dominique de Caro ◽  
Kane Jacob ◽  
...  
Keyword(s):  
Partial Oxidation ◽  
Chemical Shifts ◽  
Large Family ◽  
Photoemission Spectroscopy ◽  
Intrinsic Structure ◽  
X Ray ◽  
Level Lines ◽  
Donor And Acceptor ◽  
Electronic Configurations

The metallic and semiconducting character of a large family of organic materials based on the electron donor molecule tetrathiafulvalene (TTF) is rooted in the partial oxidation (charge transfer or mixed valency) of TTF derivatives leading to partially filled molecular orbital-based electronic bands. The intrinsic structure of such complexes, with segregated donor and acceptor molecular chains or planes, leads to anisotropic electronic properties (quasi one-dimensional or two-dimensional) and morphology (needle-like or platelet-like crystals). Recently, such materials have been synthesized as nanoparticles by intentionally frustrating the intrinsic anisotropic growth. X-ray photoemission spectroscopy (XPS) has emerged as a valuable technique to characterize the transfer of charge due to its ability to discriminate the different chemical environments or electronic configurations manifested by chemical shifts of core level lines in high-resolution spectra. Since the photoemission process is inherently fast (well below the femtosecond time scale), dynamic processes can be efficiently explored. We determine here the fingerprint of partial oxidation on the photoemission lines of nanoparticles of selected TTF-based conductors.

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