Catalytic Activity of Cobalt Nanoparticles for Dye and 4-Nitro Phenol Degradation: A Kinetic and Mechanistic Study

2017 ◽  
Vol 49 (6) ◽  
pp. 438-454 ◽  
Author(s):  
Mohammad Naved Khan ◽  
Ommer Bashir ◽  
Tabrez Alam Khan ◽  
Shaeel Ahmed Al-Thabaiti ◽  
Zaheer Khan
Keyword(s):  
Catalytic Activity ◽  
Phenol Degradation ◽  
Cobalt Nanoparticles ◽  
Mechanistic Study

The enhanced catalytic activity and stability of Fe3O4-S@C Fenton-like catalyst for phenol degradation

2021 ◽  
Author(s):  
Xin Li ◽  
Xiao Zhang ◽  
Jiankang Wang ◽  
Changju Chen ◽  
Zhongping Yao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Phenol Degradation

scholarly journals Kinetics and mechanism of meso-tetraphenylporphyriniron(III) chloride (TPP) catalysed oxidation of indole by sodium perborate

2013 ◽  
Vol 15 (2) ◽  
pp. 107-111 ◽  
Author(s):  
D. Kungumathilagam ◽  
K. Karunakaran
Keyword(s):  
Acetic Acid ◽  
Catalytic Activity ◽  
Reaction System ◽  
Kinetic Scheme ◽  
Mechanistic Study ◽  
Radical Mechanism ◽  
Aqueous Acetic Acid ◽  
Sodium Perborate ◽  
Acetic Acid Medium ◽  
Catalysed Oxidation

Developing catalyst is very significant for biologically important reactions which yield products, used as drugs. Mechanistic study on meso-tetraphenylporphyriniron(III) chloride (TPP) catalysed oxidation of indole by sodium perborate in aqueous acetic acid medium have been carried out. The reaction follows a fractional order with respect to substrate and catalyst. The order with respect to oxidant was found to be one. Increase in the percentage of acetic acid and increase in the concentration of [H+] decreased the rate. The reaction fails to initiate polymerization, and a radical mechanism is ruled out. Activation and thermodynamic parameters have been computed. A suitable kinetic scheme based on these observations has been proposed. Significant catalytic activity is observed for the reaction system in the presence of TPP.

Ce3+ self-doped CeOx/FeOCl: an efficient Fenton catalyst for phenol degradation under mild conditions

2019 ◽  
Vol 48 (10) ◽  
pp. 3476-3485 ◽  
Author(s):  
Jian Zhang ◽  
Mengxue Yang ◽  
Ye Lian ◽  
Mingliang Zhong ◽  
Jingquan Sha ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Phenol Degradation ◽  
Natural Light ◽  
Neutral Solution ◽  
Mild Conditions ◽  
Fenton Catalyst ◽  
First Time

Herein, a novel Ce3+ self-doped CeOx/FeOCl composite was successfully prepared by a facile method for the first time, which showed remarkable catalytic activity as a Fenton catalyst in the degradation of phenol under the conditions of a neutral solution, room temperature and natural light.

Scale-up biopolymer-chelated fabrication of cobalt nanoparticles encapsulated in N-enriched graphene shells for biofuel upgrade with formic acid

2019 ◽  
Vol 21 (17) ◽  
pp. 4732-4747 ◽  
Author(s):  
Shenghui Zhou ◽  
Fanglin Dai ◽  
Chao Dang ◽  
Ming Wang ◽  
Detao Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Formic Acid ◽  
Carboxymethyl Cellulose ◽  
Scale Up ◽  
Cobalt Nanoparticles ◽  
Doped Graphene

Carboxymethyl cellulose-derived Co nanocatalysts sheathed in N-doped graphene exhibited an excellent catalytic activity for base-free transfer hydrodeoxygenation of vanillin with formic acid.

scholarly journals Mechanistic Study of Silane Alcoholysis Reactions with Self-Assembled Monolayer-Functionalized Gold Nanoparticle Catalysts

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 908
Author(s):  
Katsuhiro Isozaki ◽  
Tomoya Taguchi ◽  
Kosuke Ishibashi ◽  
Takafumi Shimoaka ◽  
Wataru Kurashige ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Metallic Nanoparticles ◽  
Molecular Structures ◽  
Critical Parameters ◽  
Mechanistic Study ◽  
Self Assembled Monolayer ◽  
Mechanistic Investigation ◽  
Self Assembled ◽  
20 Nm ◽  
Silane Alcoholysis

The self-assembled monolayer (SAM)-modified metallic nanoparticles (MNPs) often exhibit improved chemoselectivity in various catalytic reactions by controlling the reactants’ orientations adsorbed in the SAM; however, there have been a few examples showing that the reaction rate, i.e., catalytic activity, is enhanced by the SAM-modification of MNP catalysts. The critical parameters that affect the catalytic activity, such as the supports, nanoparticle size, and molecular structures of the SAM components, remain uninvestigated in these sporadic literature precedents. Here, we report the mechanistic investigation on the effects of those parameters on the catalytic activity of alkanethiolate SAM-functionalized gold nanoparticles (AuNPs) toward silane alcoholysis reactions. The evaluation of the catalytic reaction over two-dimensionally arrayed dodecanethiolate SAM-functionalized AuNPs with different supports revealed the electronic interactions between AuNPs and the supports contributing to the rate enhancement. Additionally, an unprecedented size effect appeared—the AuNP with a 20 nm radius showed higher catalytic activity than those at 10 and 40 nm. Infrared reflection–absorption spectroscopy revealed that the conformational change of alkyl chains of the SAM affects the entrapment of reactants and products inside the SAM, and therefore brings about the acceleration effect. These findings provide a guideline for further applying the SAM-functionalization technique to stereoselective organic transformations with designer MNP catalysts.

Facet dependent catalytic activity of Pd nanocrystals for the remedy of organic Pollutant: A mechanistic study

2021 ◽  
Vol 570 ◽  
pp. 150775
Author(s):  
Swarnalata Swain ◽  
Bhamy Maithry Shenoy ◽  
Prangya Bhol ◽  
Sudesh Yadav ◽  
Satya Ranjan Jena ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Organic Pollutant ◽  
Mechanistic Study

Enhanced catalytic activity of cobalt nanoparticles encapsulated with an N-doped porous carbon shell derived from hollow ZIF-8 for efficient synthesis of nitriles from primary alcohols in water

2019 ◽  
Vol 21 (16) ◽  
pp. 4334-4340 ◽  
Author(s):  
Kang-kang Sun ◽  
Jia-lin Sun ◽  
Guo-Ping Lu ◽  
Chun Cai
Keyword(s):  
Catalytic Activity ◽  
Shell Structure ◽  
Cobalt Catalyst ◽  
Cobalt Nanoparticles ◽  
Core Shell ◽  
Efficient Synthesis ◽  
Primary Alcohols ◽  
Mild Conditions ◽  
Core Shell Structure ◽  
Unique Core

A cobalt catalyst derived from a unique core–shell structure based on hollow ZIF-8 and ZIF-67 is prepared for the synthesis of nitriles from alcohols in water under mild conditions.

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