A water reduction process performed by zinc metal under very mild conditions

2010 ◽  
Vol 46 (28) ◽  
pp. 5115 ◽  
Author(s):  
María J. Romero ◽  
Rosa Pedrido ◽  
Ana M. González-Noya ◽  
Miguel Martínez-Calvo ◽  
Guillermo Zaragoza ◽  
...  
Keyword(s):  
Reduction Process ◽  
Zinc Metal ◽  
Water Reduction ◽  
Mild Conditions

Impact of TiO2 layer formed on CuxS Films on the Photoelectrochemical Water Reduction Process

2020 ◽  
Vol 167 (4) ◽  
pp. 046503 ◽  
Author(s):  
Miguel Ángel León-Luna ◽  
Próspero Acevedo-Peña ◽  
Edilso Reguera
Keyword(s):  
Reduction Process ◽  
Tio2 Layer ◽  
Water Reduction

scholarly journals Electrocatalytic hydrogenation of guaiacol in diverse electrolytes using a slurry reactor

2019 ◽  
Author(s):  
Yanuar Philip Wijaya
Keyword(s):  
Reduction Process ◽  
Slurry Reactor ◽  
Catalyst Loading ◽  
Electrocatalytic Reduction ◽  
Electrocatalytic Hydrogenation ◽  
Perchloric Acid Solution ◽  
Faradaic Efficiency ◽  
Mild Conditions ◽  
Constant Potential ◽  
Low Catalyst Loading

Electrocatalytic hydrogenation-hydrogenolysis (ECH) of guaiacol was performed in an H-cell type of slurry reactor configuration with Pt/C catalyst. Different pairs of electrolytes, in catholyte-anolyte combinations, were investigated by constant potential chronocoulometry, showing that the acidic anolyte is preferable for an effective ECH. The advantages of this slurry reactor are mainly attributed to the enhanced Faradaic efficiency and recoverability of the catalyst. High guaiacol conversion (>90%) can be achieved at mild conditions (307 K, 1 atm) in perchloric acid solution (0.5 M), resulting in 54% cyclohexanol selectivity at moderate Faradaic efficiency (53%) and low catalyst loading. This work opens up the possibility of renewable synthesis of valuable chemicals from biomass-derived substrates via electrocatalytic reduction process at mild conditions.

Solar-Light Harvesting Bimetallic Ag/Au Decorated Graphene Plasmonic System with Efficient Photoelectrochemical Performance for the Enhanced Water Reduction Process

2019 ◽  
Vol 2 (8) ◽  
pp. 4782-4792 ◽  
Author(s):  
Saikumar Manchala ◽  
Lakshmana Reddy Nagappagari ◽  
Shankar Muthukonda Venkatakrishnan ◽  
Vishnu Shanker
Keyword(s):  
Light Harvesting ◽  
Reduction Process ◽  
Solar Light ◽  
Photoelectrochemical Performance ◽  
Water Reduction

scholarly journals Facile Techniques to Synthesize Reduced Graphene Oxide for Removing Tetracycline From Water: Kinetics and Thermodynamics Studies

2021 ◽  
Author(s):  
Trinh Tran Dinh ◽  
Thi-My-Trinh Ha ◽  
Thi-An-Hang Nguyen ◽  
Viet-Cuong Dang ◽  
Van-Duong Dao
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Adsorption Process ◽  
Reduction Process ◽  
Chemical Oxidation ◽  
Mild Conditions ◽  
Reduced Graphene ◽  
Langmuir Isotherm Model ◽  
Ft Ir ◽  
Synthesized Materials

Abstract In this study, reduced graphene oxide (rGO) was successfully produced from graphite precursor by chemical oxidation and exfoliation processes which were followed by a reduction process in mild conditions. rGO was then applied in the adsorption of tetracycline (TC) in water. SEM/EDX, XRD, FT-IR, BET, pHpzc were conducted to characterize the synthesized materials. The adsorption efficiency of TC from water was evaluated by changes in several factors such as contact time, temperature, pH of the solution, adsorbent load, and tetracycline concentration. Furthermore, adsorption kinetics, thermodynamics, and isotherms were also investigated. As the result, the adsorption process of TC onto rGO was spontaneous, endothermic, and governed by both physisorption and chemisorption. The maximum uptake calculated from Langmuir isotherm model was 58.03 mg/g. rGO material could be regenerated by using methanol and diluted NaOH solutions. The findings in this work provides a complete data on the TC adsorption process onto rGO and the process of recovery and reuse of rGO.

scholarly journals Nickel-Catalyzed Defluorinative Coupling of Aliphatic Aldehydes with Trifluoromethyl Styrenes

2021 ◽  
Author(s):  
Jichao Xiao ◽  
John Montgomery
Keyword(s):  
Nickel Catalyst ◽  
Nickel Complex ◽  
Simple Procedure ◽  
Reactive Intermediates ◽  
Aliphatic Aldehydes ◽  
Zinc Metal ◽  
Mild Conditions ◽  
Substrate Structure ◽  
Bipyridine Ligand ◽  
Low Valent

A simple procedure is reported for the nickel-catalyzed defluorinative alkylation of unactivated aliphatic aldehydes. The process involves the catalytic reductive union of trifluoromethyl styrenes with aldehydes using a nickel complex of a 6,6’-disubstituted bipyridine ligand with zinc metal as the terminal reductant. The protocol is distinguished by its broad substrate scope, mild conditions, and simple catalytic setup. Reaction outcomes are consistent with the intermediacy of an alpha-silyloxy(alkyl)nickel intermediate generated by a low-valent nickel catalyst, silyl electrophile, and the aldehyde substrate. Mechanistic findings with cyclopropanecarboxaldehyde provide insights into nature of the reactive intermediates and illustrate fundamental reactivity differences that are governed by subtle changes in ligand and substrate structure.

The Diorgano Dichalcogenides Addition to Benzyne under Mild Conditions

2007 ◽  
Author(s):  
Fabiano Toledo ◽  
Henrique Marques ◽  
João Comasseto ◽  
Cristiano Raminelli
Keyword(s):  
Mild Conditions

Green synthesis of mixed metallic nanoparticles using room temperature self-assembly

2017 ◽  
Vol 13 (2) ◽  
pp. 4671-4677 ◽  
Author(s):  
A. M. Abdelghany ◽  
A.H. Oraby ◽  
Awatif A Hindi ◽  
Doaa M El-Nagar ◽  
Fathia S Alhakami
Keyword(s):  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Bimetallic Nanoparticles ◽  
Reduction Process ◽  
Nano Particles ◽  
Nano Structure ◽  
Small Shift ◽  
Molar Ratios ◽  
Vis Spectroscopy

Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.

Scalable Synthesis of Functionalized Ferrocenyl Azides and Amines Enabled by Flow Chemistry

2019 ◽  
Author(s):  
Merlin Kleoff ◽  
Johannes Schwan ◽  
Lisa Boeser ◽  
Bence Hartmayer ◽  
Mathias Christmann ◽  
...  
Keyword(s):  
Reaction Time ◽  
Heterogeneous Reaction ◽  
Reduction Process ◽  
Flow Chemistry ◽  
Subsequent Reaction ◽  
Scalable Synthesis ◽  
High Yields ◽  
Reactor Section

A scalable access to functionalized 1,1’- and 1,2-ferrocenyl azides has been realized in flow. By halogen‒lithium exchange of ferrocenyl halides and subsequent reaction with tosyl azide, a variety of functionalized ferrocenyl azides was obtained in high yields. To allow a scalable preparation of these potentially explosive compounds, an efficient flow protocol was developed accelerating the reaction time to minutes and circumventing accumulation of potentially hazardous intermediates. Switching from homogeneous to triphasic flow amidst process was key for handling a heterogeneous reaction mixture formed after a heated reactor section. The corresponding and synthetically versatile ferrocenyl amines were then prepared by a reliable reduction process.

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