(Diphosphane monosulfide)platinum(II) Complexes for Hydroformylation Reactions: Their Catalytic Activity and a High-Pressure NMR Mechanistic Study

2006 ◽  
Vol 2006 (11) ◽  
pp. 2268-2276 ◽  
Author(s):  
Antonio Lofù ◽  
Piero Mastrorilli ◽  
Cosimo F. Nobile ◽  
Gian P. Suranna ◽  
Piero Frediani ◽  
...  
Keyword(s):  
High Pressure ◽  
Catalytic Activity ◽  
Mechanistic Study

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.

Catalytic activity of Co, Mo and CoMo supported on NaY zeolite: hydrodesulfurization of gas oil at high pressure

1994 ◽  
Vol 24 (1-2) ◽  
pp. 147-157 ◽  
Author(s):  
R. Cid ◽  
F. J. Gil Llamb�as ◽  
M. Gonz�lez ◽  
A. L�pez Agudo
Keyword(s):  
High Pressure ◽  
Catalytic Activity ◽  
Gas Oil ◽  
Nay Zeolite

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

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

Melamine Aminated Primary Alcohols Using Potassium Hydroxide/ Activated Carbon Catalysts

2012 ◽  
Vol 450-451 ◽  
pp. 68-73
Author(s):  
Zhen Li ◽  
Yan Ding ◽  
Jin Liu
Keyword(s):  
High Pressure ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Potassium Hydroxide ◽  
Catalyst Support ◽  
Fluorescence Analysis ◽  
Lauryl Alcohol ◽  
Primary Alcohols ◽  
Amination Reaction ◽  
Carbon Catalysts

Melamine (MA) were aminated with various primary alcohols (PA) such as lauryl alcohol(LA), octyl alcohol (OA) and monomethoxylpoly ethylene glycol (mPEG) under high-temperature and high-pressure conditions using potassium hydroxide / activated carbon (KOH/AC) as catalyst. The possible amination reaction mechanism was proposed based on FTIR, 1H NMR and fluorescence analysis of aminated products. The catalytic activity of KOH was improved remarkably by adding activated carbon as the catalyst support; and the maximum amination yield was about 95 %.

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