scholarly journals A kinetic model for redox-active film based biophotoelectrodes

2019 ◽  
Vol 215 ◽  
pp. 39-53 ◽  
Author(s):  
D. Buesen ◽  
T. Hoefer ◽  
H. Zhang ◽  
N. Plumeré
Keyword(s):  
Electron Transfer ◽  
Kinetic Model ◽  
Solar Fuels ◽  
Catalyst Loading ◽  
Active Film ◽  
Photosynthetic Proteins ◽  
Efficient Generation ◽  
Redox Active ◽  
Mediate Electron Transfer

Redox-active films are advantageous matrices for the immobilization of photosynthetic proteins, due to their ability to mediate electron transfer as well as to achieve high catalyst loading on an electrode for efficient generation of electricity or solar fuels.

scholarly journals Stimulation of Redox‐Induced Electron Transfer by Interligand Hydrogen Bonding in a Cobalt Complex with Redox‐Active Guanidine Ligand

2021 ◽  
Author(s):  
Lukas Lohmeyer ◽  
Florian Schön ◽  
Elisabeth Kaifer ◽  
Hans-Jörg Himmel
Keyword(s):  
Electron Transfer ◽  
Hydrogen Bonding ◽  
Cobalt Complex ◽  
Redox Active ◽  
Stimulation Of

Kinetic studies on esterification of acetic acid with isopropyl alcohol in presence of novel solid catalyst

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mallaiah Mekala
Keyword(s):  
Acetic Acid ◽  
Kinetic Model ◽  
Isopropyl Alcohol ◽  
Frequency Factor ◽  
Activation Energies ◽  
Catalyst Loading ◽  
Solid Catalyst ◽  
Heat Of Reaction ◽  
Resin Catalyst ◽  
Isopropyl Acetate

AbstractThe reaction of isopropyl alcohol with acetic acid was carried out in an isothermal batch reactor in presence of solid resin catalyst to produce isopropyl acetate and water. A novel solid resin catalyst Indion 140 was used in the present study. The temperature of reaction mixture was maintained in the range of 333.15 – 363.15 K. The effects of reaction temperature, catalyst loading, mole ratio, size of catalyst, agitation speed were investigated on acetic acid conversion. Further, pseudo-homogeneous kinetic model was developed for the catalyzed reaction. The forward reaction rate constants and activation energies were determined from the Arrhenius plot. The forward and backward activation energies are found to 53,459 J/mol and 54,748 J/mol, respectively. The heat of reaction is −1.289 kJ/mol with Indion 140 catalyst. The mathematical equation was developed for frequency factor as function of the catalyst loading and found that it follows a linear relationship between frequency factor and catalyst loading. The simulations were performed for pseudo homogeneous kinetic model and found that the model is able to predict the experimental data very well. The developed kinetic equation is useful for the simulation of a reactive distillation column for the synthesis of isopropyl acetate.

scholarly journals Insight to Microbial Fe(III) Reduction Mediated by Redox-Active Humic Acids with Varied Redox Potentials

2021 ◽  
Vol 18 (13) ◽  
pp. 6807
Author(s):  
Jingtao Duan ◽  
Zhiyuan Xu ◽  
Zhen Yang ◽  
Jie Jiang
Keyword(s):  
Molecular Weight ◽  
Electron Transfer ◽  
Humic Acids ◽  
Weight Fraction ◽  
Electrochemical Analysis ◽  
Microbial Reduction ◽  
Redox Potentials ◽  
Groundwater Environment ◽  
Redox Active ◽  
Different Molecular Weight

Redox-active humic acids (HA) are ubiquitous in terrestrial and aquatic systems and are involved in numerous electron transfer reactions affecting biogeochemical processes and fates of pollutants in soil environments. Redox-active contaminants are trapped in soil micropores (<2 nm) that have limited access to microbes and HA. Therefore, the contaminants whose molecular structure and properties are not damaged accumulate in the soil micropores and become potential pollution sources. Electron transfer capacities (ETC) of HA reflecting redox activities of low molecular weight fraction (LMWF, <2.5) HA can be detected by an electrochemical method, which is related to redox potentials (Eh) in soil and aquatic environments. Nevertheless, electron accepting capacities (EAC) and electron donating capacities (EDC) of these LMWF HA at different Eh are still unknown. EDC and EAC of different molecular weight HA at different Eh were analyzed using electrochemical methods. EAC of LMWF at −0.59 V was 12 times higher than that at −0.49 V, while EAC increased to 2.6 times when the Eh decreased from −0.59 V to −0.69 V. Afterward, LMWF can act as a shuttle to stimulate microbial Fe(III) reduction processes in microbial reduction experiments. Additionally, EAC by electrochemical analysis at a range of −0.49–−0.59 V was comparable to total calculated ETC of different molecular weight fractions of HA by microbial reduction. Therefore, it is indicated that redox-active functional groups that can be reduced at Eh range of −0.49–−0.59 are available to microbial reduction. This finding contributes to a novel perspective in the protection and remediation of the groundwater environment in the biogeochemistry process.

Hydroquinone/quinone electro- and photochemical interconversion in isolable polypyridylruthenium(II) complexes

2021 ◽  
Author(s):  
Dai Oyama ◽  
Takatoshi Kanno ◽  
Tsugiko Takase
Keyword(s):  
Electron Transfer ◽  
Metal Complexes ◽  
Transfer Reactions ◽  
Electron Transfer Reactions ◽  
Fundamental Knowledge ◽  
Redox Active ◽  
Quinone Complexes

Quinone derivatives and their metal complexes are well-known molecules that participate in electron-transfer reactions relevant to diverse fields. However, the fundamental knowledge on the unique reactivity of redox-active quinone complexes...

Sulfur in humin as a redox-active element for extracellular electron transfer

Geoderma ◽  
2022 ◽  
Vol 408 ◽  
pp. 115580
Author(s):  
Duyen Minh Pham ◽  
Hiroshi Oji ◽  
Shinya Yagi ◽  
Satoshi Ogawa ◽  
Arata Katayama
Keyword(s):  
Electron Transfer ◽  
Active Element ◽  
Extracellular Electron Transfer ◽  
Redox Active

Variations of Diffusion Coefficients of Redox Active Molecules in Room Temperature Ionic Liquids upon Electron Transfer

2008 ◽  
Vol 112 (47) ◽  
pp. 14952-14958 ◽  
Author(s):  
Dodzi Zigah ◽  
Jalal Ghilane ◽  
Corinne Lagrost ◽  
Philippe Hapiot
Keyword(s):  
Electron Transfer ◽  
Ionic Liquids ◽  
Diffusion Coefficients ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Redox Active

The Mechanism of Mediated Electron Transfer at Redox Active Surfaces

2015 ◽  
Vol 27 (4) ◽  
pp. 992-1009 ◽  
Author(s):  
Michael E. G. Lyons
Keyword(s):  
Electron Transfer ◽  
Active Surfaces ◽  
Redox Active ◽  
Mediated Electron Transfer
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