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Redox

About: Redox is a research topic. Over the lifetime, 26853 publications have been published within this topic receiving 862368 citations. The topic is also known as: reduction-oxidation & reduction-oxidation reaction.


Papers
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Journal ArticleDOI
TL;DR: Diffuse reflectance infrared Fourier transform spectroscopy studies showed that the synergetic effect between Mn and Ce contributes to the formation of reactive intermediate species, thus promoting the NH3-SCR to proceed.
Abstract: Mn-Ce-Ti mixed-oxide catalyst prepared by the hydrothermal method was investigated for the selective catalytic reduction (SCR) of NOx with NH3 in the presence of oxygen. It was found that the environmentally benign Mn-Ce-Ti catalyst exhibited excellent NH3-SCR activity and strong resistance against H2O and SO2 with a broad operation temperature window, which is very competitive for the practical application in controlling the NOx emission from diesel engines. On the basis of the catalyst characterization, the dual redox cycles (Mn4+ + Ce3+ Mn3+ + Ce4+, Mn4+ + Ti3+ Mn3+ + Ti4+) and the amorphous structure play key roles for the high catalytic deNO(x) performance. Diffuse reflectance infrared Fourier transform spectroscopy studies showed that the synergetic effect between Mn and Ce contributes to the formation of reactive intermediate species, thus promoting the NH3-SCR to proceed.

362 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of metal ions (Cu2+, Fe3+, Zn2+, Al3+, and Cd2+) on the photodegradation of several dyes: sulfo-rhodamine B (SRB), alizarin red (AR), and malachite green (MG) under visible irradiation (λ > 420 nm).
Abstract: The effect of metal ions (Cu2+, Fe3+, Zn2+, Al3+, and Cd2+) on the photodegradation of several dyes: sulfo-rhodamine B (SRB), alizarin red (AR), and malachite green (MG) has been investigated in aqueous TiO2 dispersions under visible irradiation (λ > 420 nm). Trace quantities of transition metal ions such as Cu2+ and Fe3+ having suitable redox potentials alter the electron-transfer pathway involving the dye, O2 and TiO2 particles, and markedly depress the photodegradation of all three dyes under visible irradiation. Other metal ions, such as Zn2+, Cd2+, and Al3+, have only a slight influence on the photoreaction by altering the adsorption of dyes. Photogeneration of H2O2 and reactive radicals, and the changes in fluorescence emission of SRB in TiO2 aqueous dispersions were examined to elucidate the role of the metal ions. Addition of Cu2+ or Fe3+ decreases the reduction of O2 by the conduction electrons, subsequently blocks the formation of reactive oxygen species (O-•, •OH), and depresses the degradatio...

361 citations

Journal ArticleDOI
TL;DR: Among the thiol agents tested for their efficacy to modulate cellular redox status, N-acetyl-L-cysteine (NAC) and alpha-lipoic acid hold promise for clinical use.

360 citations

Journal ArticleDOI
TL;DR: Citric acid chelated ferrous ion appeared effective for TCE degradation within soil slurries but required longer reaction times, and a comparison of different chelating agents revealed that citric acid was the most effective.

359 citations

Journal ArticleDOI
TL;DR: In this paper, the rate constants of photo-induced electron transfer reactions obey the Rehm-Weller-Gibbs energy relationship and the activation barrier of hydride-transfer reactions from dihydropyridine compounds (PyH/sub 2/) to p-benzoquinone derivatives (Q) in the absence and presence of Mg/sup 2 +/ ion are reported by determining over 150 rate constants.
Abstract: Kinetic studies on photoinduced electron-transfer reactions from dihydropyridine compounds (PyH/sub 2/) as being NADH model compounds to organic and inorganic oxidants and hydride-transfer reactions from PyH/sub 2/ to p-benzoquinone derivatives (Q) in the absence and presence of Mg/sup 2 +/ ion are reported by determining over 150 rate constants. These results, combined with the values of Gibbs energy change of the photoinduced electron-transfer reactions as well as those of each step of the hydride-transfer reactions as being the e/sup -/-H/sup +/-e/sup -/ sequence, which are determined independently, revealed that the rate constants of the photoinduced electron-transfer reactions obey the Rehm-Weller-Gibbs energy relationship and that the activation barrier of the hydride-transfer reactions from PyH/sub 2/ to Q is dependent solely on the Gibbs energy changes of the initial electron transfer from PyH/sub 2/ to Q and the following proton transfer from PyH/sub 2//sup .+/ to Q/sup .-/ and thus independent of the Gibbs energy change of the final electron transfer from PyH/sup ./ to QH/sup ./. The retarding effect of Mg/sup 2 +/ ion observed on the photoinduced electron transfer and hydride-transfer reactions of PyH/sub 2/ is ascribed to the positive shifts of the redox potentials of the ground and excitedmore » states of PyH/sub 2/ due to the complex formation with Mg/sup 2 +/ ion.« less

359 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
20233,178
20225,931
20211,509
20201,274
20191,219