Some tungsten oxidation-reduction chemistry: A paint pot titration

The solvation effect of a number of nonaqueous polar solvents was studied on the oxidation-reduction properties of the [Co(en)3]3+-[Co(en)3]2+ system. Interactions of these ions with the solvent molecules are discussed in terms of their coordination, which is accompanied by a specific interaction of the Lewis acid-base type, namely formation of a hydrogen bond between the interacting particles. This is the main controlling factor of the redox properties of the studied system.

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Feedback Controlled Chemical Reactor with Feed of Two Reaction Components with Spectrophotometric Indication

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19940549 ◽

1994 ◽

Vol 59 (3) ◽

pp. 549-557

Author(s):

František Skopal ◽

Václav Dušek

Keyword(s):

Sulfuric Acid ◽

Negative Feedback ◽

Chemical Reactor ◽

Reduction Reactions ◽

Oxidation Reduction

Theoretical relationships and simplifying conditions have been derived for the feed of two reaction components into a nonisochoric reactor with ideal stirring. The feed of reaction components is controlled by the negative feedback at a constant absorbance of the reaction mixture. The theoretical relationships have been verified using model 2. order oxidation-reduction reactions of Ce(IV)/V(IV) and Fe(III)/V(III) in 1 M sulfuric acid at 20 °C.

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Modern Organic Synthesis in the Laboratory

10.1093/oso/9780195187984.001.0001 ◽

2008 ◽

Cited By ~ 1

Author(s):

Jie Jack Li ◽

Chris Limberakis ◽

Derek A. Pflum

Keyword(s):

Organic Chemistry ◽

Graduate Students ◽

Organic Synthesis ◽

Functional Group ◽

Bond Formation ◽

Reaction Conditions ◽

Carbon Bond ◽

Oxidation Reduction ◽

Carbon Carbon Bond ◽

Daunting Task

Searching for reaction in organic synthesis has been made much easier in the current age of computer databases. However, the dilemma now is which procedure one selects among the ocean of choices. Especially for novices in the laboratory, it becomes a daunting task to decide what reaction conditions to experiment with first in order to have the best chance of success. This collection intends to serve as an "older and wiser lab-mate" one could have by compiling many of the most commonly used experimental procedures in organic synthesis. With chapters that cover such topics as functional group manipulations, oxidation, reduction, and carbon-carbon bond formation, Modern Organic Synthesis in the Laboratory will be useful for both graduate students and professors in organic chemistry and medicinal chemists in the pharmaceutical and agrochemical industries.

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Beef adrenal cortical cytochrome P-450 which catalyzes the conversion of cholesterol to pregnenolone. Oxidation-reduction potentials of the free, steroid-complexed, and adrenodoxin-complexed P-450.

Journal of Biological Chemistry ◽

10.1016/s0021-9258(19)70141-0 ◽

1981 ◽

Vol 256 (1) ◽

pp. 343-350

Author(s):

D.R. Light ◽

N.R. Orme-Johnson

Keyword(s):

Reduction Potentials ◽

Oxidation Reduction ◽

Cytochrome P 450 ◽

Free Steroid

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Oscillatory Behaviour of Ni Supported on ZrO2 in the Catalytic Partial Oxidation of Methane as Determined by Activation Procedure

Materials ◽

10.3390/ma14102495 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2495

Author(s):

Daniela Pietrogiacomi ◽

Maria Cristina Campa ◽

Ida Pettiti ◽

Simonetta Tuti ◽

Giulia Luccisano ◽

...

Keyword(s):

Catalytic Activity ◽

Partial Oxidation ◽

Active Sites ◽

Direct Reduction ◽

Partial Oxidation Of Methane ◽

Catalytic Partial Oxidation ◽

Oxidation Of Methane ◽

Short Contact Time ◽

Oxidation Reduction ◽

Ni Species

Ni/ZrO2 catalysts, active and selective for the catalytic partial oxidation of methane to syngas (CH4-CPO), were prepared by the dry impregnation of zirconium oxyhydroxide (Zhy) or monoclinic ZrO2 (Zm), calcination at 1173 K and activation by different procedures: oxidation-reduction (ox-red) or direct reduction (red). The characterization included XRD, FESEM, in situ FTIR and Raman spectroscopies, TPR, and specific surface area measurements. Catalytic activity experiments were carried out in a flow apparatus with a mixture of CH4:O2 = 2:1 in a short contact time. Compared to Zm, Zhy favoured the formation of smaller NiO particles, implying a higher number of Ni sites strongly interacting with the support. In all the activated Ni/ZrO2 catalysts, the Ni–ZrO2 interaction was strong enough to limit Ni aggregation during the catalytic runs. The catalytic activity depended on the activation procedures; the ox-red treatment yielded very active and stable catalysts, whereas the red treatment yielded catalysts with oscillating activity, ascribed to the formation of Niδ+ carbide-like species. The results suggested that Ni dispersion was not the main factor affecting the activity, and that active sites for CH4-CPO could be Ni species at the boundary of the metal particles in a specific configuration and nuclearity.

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